The truck runs fine, and when I get up to my cruising speed, the ticking goes away. The pistons can also wear and make noise. When your transmission "slips", it may show an RPM of 3500+ or take a long time to coast. There can be a problem with the transmission, wherein the bike pops out of gear, starting with 2nd. The vehicle was taken to the dealer for diagnostics where the technician replaced the transmission fluid and filter. The flex disc will eventually soften and/or develop cracks. Hello, My Octavia Estate 2. Strange surges of power or grinding noises during gear shifts could mean your transmission is troubled. i've had my 2005 tundra for almost 6 years. Due to their engine configuration, Subarus are more susceptible to knocking from worn pistons than other cars. This feature is not available right now. An addition to that, it also idles wierd. Is this a cause for concern?. Low transmission fluid level could the source of the rattling sound when accelerating. plugs are pretty new and she runs well. Finding out what is wrong with your car by feel, smell, look, and sound. I've was having a noise similar to previously described on acceleration that was resolved. parked it last night woke up this morning, starts fine put it in drive and floored it and im not getting any acceleration!. That lets it shift down (kickdown) when you want to accelerate and are pushing the gas pedal harder. For the last 2-3 months I’m hearing and feeling a clunking or rattling noise (I can’t decide which it is) coming from the rear of the vehicle at random times. Recently, the noise is louder. I am hearing a clunking/knocking noise when I accelerate and decelerate, especially in lower gears. Also, in the 1990's, Mack began producing a revised replacement piston design for the 237 and 285 engines which caused more of a "combustion knock" than the original design. The most likely cause is a damaged primary timing chain tensioner. Similar to the engine, the A/T will only run properly when filled with the right amount of transmission fluid. For extra trouble shooting please call us at (408) 492-8980 to schedule an appointment at our San Jose auto repair shop or contact a transmission specialist through our website form. it only happens the instant you hit the gas and it's fine as long as i keep accelerating, but as soon as i let off the gas, the knock happens again. The noise is worse while under load and actually in motion. We have a 1999 Ford Windstar SE minivan with the 3. The energy stored also might not do anything at all, or the stored energy can even be harmful, reducing acceleration or braking. Porsche Macan Transmission Problems. A commercial electron energy-loss spectrometer (EELS) attached to a high-resolution cold-field emission scanning electron microscope in transmission mode (STEM) is evaluated and its potential for characterizing materials science thin specimens at low accelerating voltage is reviewed. Had this problem before and it turned out to be a cracked transmission mount, so I've ruled that out as it is the first thing I checked. by Kyle McFadden. Guys, I'm the newbie here, so forgive for the amount of ignorance involved on this end. The energy stored also might not do anything at all, or the stored energy can even be harmful, reducing acceleration or braking. We didn't perform any testing other than the old "hit it with a hammer and see if it rattles" type of exhaust test, but a quick sawzall job took the cat off and it was clear. This usually occurs a few minutes after being warmed up, and does not typically do it at idle. im in this same boat i have this exact rattle when i let off the gas and coast. When I start moving the first shift happens fine, then the engine winds way up before the next shift which happens with a hard clunk and a kick in my seat, then the next shifts are fine. It sounds like someone is hitting the frame with a hammer, about twice a second. Here is what I have: 2015 Subaru Forester Touring 2. It doesn't happen every single time, but it happens very very often. Noise from drive train during normal driving. You may have to register before you can post: click the register link above to proceed. Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. i believe my rattle may either be from that or i was also advised to check the main center bearing that hold up the drive shaft. If you're questioning what is normal engine noise, I may have the answer. I have a 2006 2. It sounds like it may be valves, but then again it also sounds like it could be a knock. I lease two (2) XT5s, both cars have this problem. The noise only occurs when the steering wheel is in the straight ahead position and sounds like the noise is in the left suspension of the vehicle or directly in front of the driver. If your car makes noise when accelerating or turning, don't ignore it. Single "clunk" when accelerating from a stop I was hoping someone could help. This engine misfire didn’t arrive only under load: It could as well show up at idle as when accelerating. if I accelerate slowly the sound will be minimal. The other day I noticed a knocking sound as i was rolling out my bike. What Causes a Car to Shake While Accelerating? Credit: DreamPictures/Blend Images/Getty Images There are various reasons why vehicles shake while accelerating and some of them include a clogged transmission filter, a worn-out universal joint and low transmission fluid. You must use your knowledge of each system to detect which component is causing the trouble. The other day I noticed that on the way to work in the morning, my car had a very hard time accelerating (felt like it was going to stall). Transmission jerks or slips between shifts. Almost sounds like rod knock, but I just put the engine in and its been doing it since i first started it up. The automatic transmission relies on bands and clutches to change gears, and the only way they can be applied is by fluid pressure. A commercial electron energy-loss spectrometer (EELS) attached to a high-resolution cold-field emission scanning electron microscope in transmission mode (STEM) is evaluated and its potential for characterizing materials science thin specimens at low accelerating voltage is reviewed. Similar to a manual transmission's clutch, locking it (clutch pedal out) decreases slippage while increasing horsepower to the wheels; unlocking it increases slippage but increases torque to the wheels (via a multiplier). I'm getting a loud humming/vibrating/knocking noise - like someone knocking on a door, only less loud - when accelerating and when I stop accelerating, the noise stops, but the actual vibration with a slight knocking noise doesn't seem to end until the car comes to a complete stop. Such noises indicate problems with the individual planetary gears, input shaft or interior transmission bearings. Low vacuum, retarded timing, no power, surging when accelerating and the trans shifting at strange points, all indicated, among other things, a possible clogged exhaust. V6 model; When I shift from Drive to Reverse, I hear a loud "clank" from the transmission - and when accelerating slowly, the shift from first to second sounds like a piece of metal hitting another me. During initial Deceleration this same noise occurs. When your transmission slams into gear it can be a sign of abnormal pressures, worn components or even a low fluid level. My car has an automatic transmission. The transmission is adaptive and shifts at different times depending on what it has learned. The oil pressure is good and I have good acceleration and no loss of power. I have a 2010 tacoma 4 cyl manual transmission. Transmission knob was moved to the left (for downshift) and then didn't accelerate when the accelerator was pressed. Vehicle doesn't do it when cold or when first started, only when warmed up. Rod knock sound only when accelerating? I have a 2002 Jeep Liberty with 146,000 miles on it. My car has 117000 miles. Knock is normally associated with diesels. Clunk from motor when going slowing down and accelerating + whining noise at 65+mph Submitted by ElectricZo on September 19, 2013 I have been noticing a 'clunk' feeling/noise when transitioning between slowing down and speeding up. I got the axles from car quest for 55 each made in canada come with life time warranty. The flywheel is fastened firm to the engine crankshaft, and the transmission engages it as you begin to drive. Only when it's lightly accelerating, sometimes, but most of the time it doesn't. I have a somewhat similar problem: In slow stop and go drinving conditions (city) I can hear a light clunck noise when I accelerate and then another one (a bit louder) when I break and the car is about to stop (less than 5mph). my exhaust is not stock and it has 2 slip joint to connect the smaller stock pipe to the bigger. A few more miles and many warning lights came on and didn't go off. my exhaust is not stock and it has 2 slip joint to connect the smaller stock pipe to the bigger. Re: wierd clicking noise when accelerating May 06 2013, 5:21am hi lawnguy32, can you explain it what did you do with more details, cause i thing i have the same issue i wanna try what ever you did to you truck, but i also gonna flush the tranny fluid and replace the filter too. I'm thinking it could be a transmission torque mount or some other bushing or mount?. Varga Auto Repair & Transmission Center provides Engine Diagnostics and Performance services to North Brunswick, NJ, Edison, NJ, East Brunswick, NJ, and other surrounding areas. I know it is not a rod knock, as the engine starts and purrs perfectly with start-up, just where there would be the rod noise if that was the issue. When I would first start the car, engine sounded smooth and okay, but after awhile my engine would make knocking/ticking sounds when first accelerating and then for a second or two after I took the foot off the accelerator. My Bike seems to make a Strange Noise. Transmission noise (sound like bearing failure) I had my car now for 2 years. After ruling out any problems with the powertrain, he found a wire that was loose and resting on metal. So, accelerate, clunk, clunk, drive. These were the brake light (not the ebrake), the RAB disabled, eyesight, AT oil temp,transmission, check engine, hill assist disabled, the lane assist, and BSD. he said that i should use thicker oil from now on and then i will probably have to get it fixed in less then six months. When the transmission fluid sits for long periods of time like yours it tends to become gummy and valves stick. If you're experiencing engine knocking or your engine stalls frequently, bring your car into a Firestone Complete Auto Care store where our experienced Tire and Auto Service Professionals will run an engine diagnostics. 8 is known for the intake manifold going bad. Knocking while accelerating I've read around on the forum here trying to see if anyone else had the same issue and what they found out but so far nothing solid that I can find. Also please check out the statistics and reliability analysis of Ford Focus based on all problems reported for the Focus. This part is responsible for gear changes when you accelerate. It just started doing this today. 1995 Honda Civic EX 1. Maybe it's my driving style. Under A/C and high revving load, the exhaust will be warmer than "normal" and thermal expansion of the various components (manifold/shield/hardware) could cause a slight loosening of the shield (not the hardware, just more room between the manifold and bolt heads when hot). 7L Engine / Mods: Bolt-ons, Exhaust, Tuning ' started by Nagare , Jan 22, 2019. Nearly ready to make an offer, and on my second test drive discovered that with engine running in neutral and clutch out, the transmission was making a knocking noise. Don't let it go, you will get stranded. 2017 Hyundai Tucson AWD 2. SYMPTOMS OF INCORRECT IGNITION TIMING Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or "pinging" or "spark knock". The transmission solenoid is responsible for opening or closing valves in the valve body to allow transmission fluid to enter, at which point the fluid can do its thing and pressurize the clutches and bands. My Jeep Wrangler Bogging, sputtering and losing acceleration Also when this problem happens, there is an exaust/ gas like smell that is really noticable. Vehicle Stability Assist (VSA) System The Vehicle Stability Assist system helps to stabilize the vehicle during cornering if the car turns more or less than desired. Initially I thought this was an issue of engine valve tapping, but as I think it through I think it has something to do with the transmission or driveline. I haven't had very many complaints with it. 6 tekna Knocking noise on transmission when accelerating from cruise? - Problem from Auto Insider Problems and Fixes. Watch a valve rocker to see if it keeps time or is twice as fast. It's almost as if something isn't tight and once I hit the gas it sounds like something locks into place or a piece of metal hitting against another piece. Now then, if the knock happens when the ICE is not running, it is definitely suspension or other body parts moving. if I accelerate slowly the sound will be minimal. As soon as I pushed the clutch in, noise went away. Average failure mileage is 3,900 miles. Breathing issues or lack of fuel. Only issue I have which wasn't picked up on the test drive is that every now and then when I accelerate there's a slight. Replied by EricTheCarGuy on topic Engine knock when accelerating. It sounds exactly like the knocking on a diesel engine (or like my old VW sounded when the oil was low). dia of the aftermarket exhaust. With franchises conveniently located coast-to-coast, Mister Transmission is the largest chain of transmission and driveline repair specialists in Canada. Recently it has been making a sound similar to that of "rod knock" but only when accelerating, when going at stable RPM's and when decelerating, you cannot hear it at all. It disappears when I stop accelerating or sharply reduce my acceleration. It happens only occasionally, specifically when I start to brake, accelerate or sometimes when I let go of the gas. I drive about 100 miles round trip a day to and from work. If the car is revved in neutral, there is no knocking sound. A burnt smell coming from under your hood. Drive Shaft Noises. In addition read about one BMW Owners' experience and discussion with a ZF Engineer on the Lurch variants - a simple technical admission of the Lurch by ZF :. It's caused by overadvanced ignition timing and occurs only under power. It's only when the engine is under load. Transmission "bangs" into gear when accelerating from a full or a "rolling" stop (vehicle did not come to a complete stop). A rattling or a knocking sound may be produced by weak or broken clutch disc torsion springs. Here’s how to interpret that knocking noise and other mysterious sounds. It disappears when I stop accelerating or sharply reduce my acceleration. It does this by regulating the engine's output, and by selectively applying braking. Transmission slips in 4th and 5th gear accelerating? If this is your first visit, be sure to check out the FAQ by clicking the link above. • A “howl or whine” during acceleration over a small or large speedrange is usually caused by worn ring and pinion gears or improper gear set up. It doesn't make this noise when idling, or when accelerating hard. Jetta crank/rattle noise when accelerating 06-10-2009 02:17 PM #1 I really didn't want to post this because I hate just posting questions but this noise is driving me insane. Now, the problem is that when i go WOT, the engine roar and rpm climbs but I feel like the car is not accelerating fast like it used too. The 2012 Jeep Grand Cherokee has 1 problems reported for clunking when accelerating from a stop. Drive Shaft Noises. The symptom is more pronounced when the engine is at operating temperature. Finding out what is wrong with your car by feel, smell, look, and sound. When your transmission "slips", it may show an RPM of 3500+ or take a long time to coast. Re: 4L80E Transmission Problems: james d smith: 7-25-08 : Thank you for taking my question,A friend of mine wanted to buy my 1994 gmc 2500 4x4 diesel 6. The other day I noticed that on the way to work in the morning, my car had a very hard time accelerating (felt like it was going to stall). To see how frequently Porsche Macan problems occur, check out our car reliability stats. I've looked all through the engine bay to see if something is loose, but I don't see anything. 6 tekna Knocking noise on transmission when accelerating from cruise? - Problem from Auto Insider Problems and Fixes. The knock is only once upon acceleration and/or deceleration. 5i non-turbo CVT Transmission and X-Drive 13K Miles The noise usually presents itself with some mild acceleration in a straight line. Since 1963, Mister Transmission is the name Canadians trust to provide them with high-quality transmission repairs and expert service. Hard to discribe spark knock, but if you're going to hear it, it would be under load. If I'm easy on the gas pedal is doesn't happen, or if it does it's much softer. I searched this morning and came across a very similar situation on roc which turned out to be ice. Re: Knocking sound when accelerating from a stop or low RPM. sounds like its coming from under the drivers seat or just in front of it (almost as if its the dash). It is directly linked to the speed of the vehicle, engine rpm, or transmission more specifically because if I am going very slow it is a methodical tick, and the last tick you hear is almost like a ttttiiiiiiccccckkkkk because of the speed. An automatic transmission can also produce scraping or roaring noises when we drive. I had driven about 2 miles and was departing from stop light. Average failure mileage is 60,000 miles. Incoming search terms: Car Seems To Lose Power While Driving,Car Losing Power When Accelerating,Car Shaking Like It Going To Cut Off,If My Car Was Over Filled With Oil Would It Feel Like Its Holding Back And Not Run Correctly,Why Eveytime I Step On The God The Car Act Like It Goin Fly. My first thought is transmission, but not sure. Our trusty 240SX SE (Auto) has developed an intermittent noise under acceleration when in gear. With franchises conveniently located coast-to-coast, Mister Transmission is the largest chain of transmission and driveline repair specialists in Canada. One of the first signs of transmission problems is when your transmission shifts hard. * Worn or damaged drive axle CV joints. At 7500 miles its back to the dealer because the transmission noise is prominent at 55mph and at 70-75 mph. I have a 2010 tacoma 4 cyl manual transmission. It sounds like something is knocking, and its jumpy. The whining can come from your transmission when gears begin to wear down from constant use, or the transmission fluid is running low from a leak. Hi, folks, I have a '97 Ranger with about 120k, 5 spd manual transmission, 2wd. Has someone at least put the correct amount of fluid into the transmission? That might be a start… Continued use with low fluid whilst it keeps making noises won't help. Almost like it’s switching to seamlessly. Also, during accelerating around 60-70 MPH, it doesn't happen every time, but it does happen often, now when it does happen I noticed if I turn the wheel left or right a little bit while accelerating, the shaking does disappear and once the wheel is straight again it will vibrate. If I'm easy on the gas pedal is doesn't happen, or if it does it's much softer. The sound is like a pinging or knocking at the back of the motor and only under load/acceleration. It didn’t happen when the truck was cold but would show up when it had warmed up. Also, when letting off the gas in town it'll down shift hard and have a noticeable knock. That means it isn't perfectly lined up, and there's a rattle or knocking noise that happens under load. We have been having an issue with a clunking when 'punching' it from a stop (it sounds like it's to the right and a little to the front from driver's seat). When I stop accelerating, the knocking stops as well. 0L manual transmission 2005-2007 Mustangs may exhibit a rattle or knocking noise on light acceleration between 1800-2200 RPM around 45 MPH (72 Km/h). The noise keep coming as long as I keep foot on and maintaining the same speed at 25 mph or higher. • A “howl or whine” during acceleration over a small or large speedrange is usually caused by worn ring and pinion gears or improper gear set up. Always begin replacing the easiest and cheapest part first, which is the fuel filter. Car jerks when accelerating at low speeds is not something rare. It's almost as if something isn't tight and once I hit the gas it sounds like something locks into place or a piece of metal hitting against another piece. A blown gasket can also cause this sound. I went up Pikes Peak two days ago and when coming down 19 miles in 1st gear it rattled like a bag of marbles. I lease two (2) XT5s, both cars have this problem. I have attached the log file that shows this. Not always, my Soarer and GTR Skyline had "knock" levels on their fuel management and controller modules, the SS Commodore has knock sensors and if I want to I can get a "knock" readout from them as well. Re: Clunk from Transmission This only happens 98% of the time when the vehicle is already in 2nd gear and the car is travelling below 10MPH, often sub 5MPH, I get a Clunk, which you can both FEEL and hear, normally just after you have applied the brakes and the vehicle, obviously remains in second gear. Use some fast acceleration, allowing the transmission to firmly shift. My Bike seems to make a Strange Noise. 0 5400 KM Hey guys, I have a brand new Tucson AWD, purchased the vehicle in March 2017. The noise only occurs when the steering wheel is in the straight ahead position and sounds like the noise is in the left suspension of the vehicle or directly in front of the driver. If the car is running low on transmission fluid, refill the reservoir to the proper level. I haven't had very many complaints with it. people thought it was a valve because I have a somewhat rough idle, then some thought it. Car jerks while accelerating. Is this a cause for concern?. I can feel the knocking force by my left foot. Bad Engine Mount (Idle, Accelerating and Driving) - The engine mount is what connects the vehicle's engine to the rest of the body of the car. Such noises indicate problems with the individual planetary gears, input shaft or interior transmission bearings. Below is a list of some of the most important parts of the Miata. Transmission jerks or slips between shifts. For the last 2-3 months I'm hearing and feeling a clunking or rattling noise (I can't decide which it is) coming from the rear of the vehicle at random times. Transmissions are important because they control the engine's RPMs to ensure that the engine isn't overexerting itself while accelerating. It is a single or sometimes double tap / knock sound which happens just as the car moves off and you feel yourself being pushed into the seat. Most apparent when coming up to speed on the highway or slight acceleration at highway speeds (>60 mph), engine revving between 2k to 3k rpm. Car problem(s) with the 2013 INFINITI JX35. If you drive it rather soft, it'll shift early and at lower RPM's. In addition read about one BMW Owners' experience and discussion with a ZF Engineer on the Lurch variants - a simple technical admission of the Lurch by ZF :. A few more miles and many warning lights came on and didn't go off. I can feel the knocking force by my left foot. The transmission is adaptive and shifts at different times depending on what it has learned. Clunking when accelerating or decelerating was created by K. well, within the last month i had done an oil change on it and everything had been going good up until about a week ago. I've even towed an ATV and a trailer full of OSB boards with no problems. Start by checking your transmission fluid level and condition on the dipstick. Noise from drive train with engine idling and clutch pedal depressed. 2002 Mercury Mountaineer with an ominous driveline clunking sound is diagnosed PLUS an experience about helping others and the ethics of returning favors. We have taken it to the dealer for repair 4 times now, with another appointment today. An addition to that, it also idles wierd. Torque Converter. Sounds like its coming from drivers side. 2002 Jeep Wrangler Sahara (5-Speed Manual): Hey guys, hope all is well. Breathing issues or lack of fuel. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. The most recently reported issues are listed below. Your engine's constant drone suddenly gives way to a loud roar and the Check Engine light pops on. Also some hypermiling techniques but that's besides the question. transmission, or differential troubles could be at fault. I am 😀 Not a whining type noise although I do hear a whistle when at idle. Its a single knock when letting off the gas or when punching the gas. Re: Whining metallic knocking noise coming from engine when accelerating Originally Posted by gadge The six speed gearbox is the imfamous M32 box which has a terrible reputation for poor reliability but there are tell tale signs such as the gear stick moving as you accelerate or the whining only happening in 5th and 6th. Loud knocking when accelerating from low revs My CBR600 F(P) '93 has a very loud knocking noise when I'm accelerating from low revs, in all gears. is derived from a manual transmission and gives you the convenience of A. Ford Focus owners have reported 84 problems related to transmission noise (under the power train category). And then eve,rytime when accelerating on the highway, the same thing although today after the oil change it seems to be a lot less. If you feel/ hear "rocks" knocking from the back of the car I think you in trouble. After some research pointed me in the direction of the engine / transmission mounts, I decided to have a look at the one that gets mentioned most often and seems easy enough to inspect. Upon initial acceleration there is a single Knock/Clunk/Thud type sound that eminates from the front of the car. These components will wear and become noisy on acceleration, the degree to which depends more on their usage than the vehicle manufacturer. “Rocking” a vehicle to get it out of a snow bank or rut can easily destroy a transmission in minutes. It didn’t happen when the truck was cold but would show up when it had warmed up. Maybe it's my driving style. Knocking during accelerationhelp I'm hoping that you guys can point me in the right direction with this. It's not really loud, just a faint chattering noise (similar to if you were to test a spark plug out of socket). So lately I noticed that my car been making these knock like sound when Accelerating from a stop. Transmission "bangs" into gear when accelerating from a full or a "rolling" stop (vehicle did not come to a complete stop). Rattling sound from engine when accelerating what is it? Hi, I have a 1996 Toyota Corolla and starting a 2 - 3 days ago when ever I accelerate from a point there is a rattling sound every so often if listen carefully (it rattles for about 2 or 3 times like rattle rattle rattle very quickly), while driving i could hear it very faintly. Your car’s engine needs both fuel and air to do its work. If your car is shifting for no apparent reason and your engine starts making a whining noise, you may have problems with a slipping transmission. I have a 2006 2. Delay in shifting out of park. 4 engines are commonly known for intake gasket leaks and the 3. Replied by EricTheCarGuy on topic Engine knock when accelerating. I have a 2011 Forte with approximately 21,000 miles on it and I just started to notice that there is a low rythmic rattle (increasing as accelerating and then goes away) when the engine is under load (with either the fan and/or AC on). PCM Pulling Timing When Accelerating Hi, I'm having an issue when I give a good amount of throttle, the PCM starts pulling timing - and the car barely wants to accelerate. It’s hard to say for sure which ones are worrisome until you determine the cause. These sounds indicate problems that require the removal of the transmission and clutch assembly for repair. Please discard Corporate Bulletin Number 01-04-17-004A. The other day I noticed that on the way to work in the morning, my car had a very hard time accelerating (felt like it was going to stall). Vehicle Comes to Complete Stop or Accelerating from Complete Stop or Accelerating from Complete Stop (Replace Rear Drive Shaft Nickel-Plated Slip Yoke) - (Jan 5, 2005) This bulletin is being revised to add Cadillac Escalade (Old Style) and HUMMER H2 to the Models section. Engine stalls when put in drive. My initial guess is that it's something with the driveshaft. In addition read about one BMW Owners' experience and discussion with a ZF Engineer on the Lurch variants - a simple technical admission of the Lurch by ZF :. The usual cause of engine ping is over advanced. Also please check out the statistics and reliability analysis of Jeep Cherokee based on all problems reported for the Cherokee. 6 tekna Knocking noise on transmission when accelerating from cruise? - Problem from Auto Insider Problems and Fixes. One common trigger for major auto repairs is transmission problems. When the clutch is pulled in it seems to stop. The dealer also said it's pulling right (which it is), and needs an alignment and it's going to be due for tires on a couple months. Stall when engaging transmission (automatic, usually manual low or reverse): Torque Converter Clutch. Re: Car makes noise when accelerating Sign In so i took it back to the place i got the oil changed and he said the same thing, that it sounds like one of the pistons is knocking on the inside. Transmission slips could also result from broken or worn out bands. I'm not sure if this is because road noise blocks it out, or it's so fast-paced that it just becomes one constant noise. only when accelerating or reving the engineWould appreciate any ideas. Our trusty 240SX SE (Auto) has developed an intermittent noise under acceleration when in gear. Re: 4L80E Transmission Problems: james d smith: 7-25-08 : Thank you for taking my question,A friend of mine wanted to buy my 1994 gmc 2500 4x4 diesel 6. And then eve,rytime when accelerating on the highway, the same thing although today after the oil change it seems to be a lot less. It’s one of the most common reasons why a car jerks when accelerating. My 2002 Honda Accord with 82500 miles on it jerks a bit when accelerating. (Page 1 of 2). Sue, I'm not sure about your engine size, but the 3. I have a 2007 escalade ext and I'm experiencing a clunk noise when I accelerate from a stop or even sometimes when slowing down it seems like it's only doing it on low speed not sure if it's tranny or drive axle I also noticed that when I slow down the Rpms bounce up and down not sure if this is normal went from a f150 to an escalade. It is an automatic transmission car and the metal to metal sound seems to occur right as the automatic transmission moves from one gear to the next. Fault Codes The PCM incorporates a Self Diagnostic Function which detects System Malfunctions. VS Commodore Engine & Transmission Fault Codes. A blown gasket can also cause this sound. It is a little odd, I have noticed that there is a KR everytime I accelerate. knocking from drivetrain under hard acceleration Hi All, I have a loud rapid knocking sound from the drivetrain (sounds like from the front) under full throttle from a standing start. Cadillac has not been able to diagnose or correct the problem. Knocking noise when accelerating on a automatic transmission engine, does it have anything to do with the gearbox When the car stop and when i want to accelerate, it make the sound and stop after a while. The transmission is the eight-speed ZF 8HP automatic transmission. Knocking noise on my nissan almera 2005 when accelerating and low power, what could be the problem? - Answered by a verified Nissan Mechanic We use cookies to give you the best possible experience on our website. It also assists you in maintaining traction while accelerating on loose or slippery road surfaces. If the flywheel or flexplate is cracked, it bends slightly as you accelerate due to torque. Its a steady knocking sounds and is pretty loud. When an engine starts knocking, one of the first things a mechanic will check is the oil pressure. This engine noise is caused when there’s too much clearance between the crankshaft and the surface of the connecting rod. Also please check out the statistics and reliability analysis of Ford Focus based on all problems reported for the Focus. Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. Knock is normally associated with diesels. Re: Clicking/Cracking Noise when Accelerating Only Apr 08 2012, 8:52pm I'm not sure how they are bolted or welded on a Silverado but years ago I had a Monte Carlo that sounded the same and it turned out to be some loose bolts holding the flywheel. Transmission slipping, grinding, or jumping during acceleration when the car is shifting gears. After some research pointed me in the direction of the engine / transmission mounts, I decided to have a look at the one that gets mentioned most often and seems easy enough to inspect. That lets it shift down (kickdown) when you want to accelerate and are pushing the gas pedal harder. The most recently reported issues are listed below. First let us be aware of the idling concept i. When I'm accelerating hard (well, everything's relative) in gears 4, 5 & 6, I get a knocking sound from the transmission in my '07 Skoda Octavia 2. I've tried to find an answer to this question, but haven't quite come across this situation. parked it last night woke up this morning, starts fine put it in drive and floored it and im not getting any acceleration!. I'm thinking it could be a transmission torque mount or some other bushing or mount?. Valve train noises occur at half of crankshaft speed so even if your ear can't tell whether the noise is happening at 700 rpm (raps per minute) or only 350 rpm, your eyes can. Knocking noise on my nissan almera 2005 when accelerating and low power, what could be the problem? - Answered by a verified Nissan Mechanic We use cookies to give you the best possible experience on our website. The slowing down clunck occurs when I think the mechanical brakes would take over regen. It's your obligation to take it straight to Subaru to give them a chance to fix the problem before it gets worse. Hesitant Acceleration Due To Fuel Supply. Tech A says a chipped or broken tooth gear can make a clicking or knocking sound in manual transmission. Most apparent when coming up to speed on the highway or slight acceleration at highway speeds (>60 mph), engine revving between 2k to 3k rpm. I have an 01 Corolla with 117K miles (1ZZ-FE and C59 manual trans and front-wheel drive) that makes a single clunk under two conditions:. You may want to check your motor mounts for a worn condition. i actually get a similar sort of noise. Always begin replacing the easiest and cheapest part first, which is the fuel filter. A car hesitates when accelerating is a symptom that shows an imperfect internal combustion in your engine. Rattling sound only when accelerating Hello -- I recently started experiencing a problem with my 2002 Toyota 4Runner (168k miles) where it is making a metallic rattling sound on acceleration. Are you experiencing whining noise when accelerating your car to high RPM speeds? This seems to be a common problem with many cars. Transmissions are important because they control the engine's RPMs to ensure that the engine isn't overexerting itself while accelerating. Not always, my Soarer and GTR Skyline had "knock" levels on their fuel management and controller modules, the SS Commodore has knock sensors and if I want to I can get a "knock" readout from them as well. When I'm at a dead stop or just barely moving, something makes a clunking noise in the rear end of the car. It is a single or sometimes double tap / knock sound which happens just as the car moves off and you feel yourself being pushed into the seat. I recently purchased a new 2018 ecoboost. Similar to the engine, the A/T will only run properly when filled with the right amount of transmission fluid. Car problem(s) with the 2013 INFINITI JX35. Knock/Bump when accelerating from a full stop I got a 2008 Tacoma 4x4 Crew cab and I noticed a bumping/knocking sound when accelerating from a full stop. If you're experiencing engine knocking or your engine stalls frequently, bring your car into a Firestone Complete Auto Care store where our experienced Tire and Auto Service Professionals will run an engine diagnostics. I was driving on a hilly highway and my car lost speed and was having trouble accelerating back up to the speed limit. I'll try and give a couple of tips which worked fine for beginners.