This only started occurring a day or 2 ago. I also hear the same sound when decelerating, or when turning into a driveway. This may be a shot steering u-joint as well. The Internet's largest Ford Mustang Forum for all generations of Ford Mustangs, from Classic Mustangs to Late Model Mustangs. it seems to be from the front middle of the car. This is the same kind of noise I describe through out this thread but it just a single pop/clunk instead of the quick popping up hills and acceleration. It has recently started to make a single knock or clunk sound when I accelerate and brake. Breaking hard, driving normally or accelerating doesn't cause this either. Check drive shaft runout, angle, and inspect for dents, missing weights, or other damage. [Inquiry:] 87 740 wagon with 190k, M46 trannie, new to us. Anyone have any ideas? It also happens when backing out of the driveway turning the wheel then accelerating forward. I've got a 2008 Escalade with no known issues. The noise is like a 'clunk clunk clunk' right around 2k and 3k rpms, its real brief, but very noticeable. It only happens after braking at a stop then taking off. Clunk at slow speed and here's a typical scenario when it occurs: 1. It sounds like the noise is coming from the dirveshaft or the rear end maybe. It is as if the whole jeep shifts backwards an inch. If I were to start the car right now and drive away it would not make the noise. Owners' Feedback - Taken from sources throughout the Internet. I have this noise in my 04 sierra 2500HD 4l80E Drivetrain Every time I shift into gear D or R You get this loud Metal Clanking noise, I had a buddy lay on the ground and see where its coming from when i shift from first to reverse and it sounds like it's coming from the middle of the DS but it can't be!. Variable Trolling Control Yamaha’s variable trolling control allows t he skipper to precisely adjust the engine’s idling speed from 600 to 1000 RPM in 50 RPM increments. My snub was toast (as in, crumbled apart when I swapped it) and I had no shuddering or vibration. I'm running a aristo vvti with a single turbo, top feed injectors, 485 walbro. Big pain, I thought it might be the strut, but if its the steering column and I can lube it then that's a whole lot better. 2004 - 2008 Ford F150 - General discussion on the 2004 - 2008 Ford F150 truck. It's not causing any problem, but was just wondering if anyone else had any input, before I take it to the. Why is there a clunk in rear end of my 99. Its a single knock when letting off the gas or when punching the gas. The "clunk" you are hearing is probably just all the slack in the driveline being taken up when you release the clutch. Even if I have to lube it every few months. It's recently started making a noise and I would like to narrow it down before taking it to our local mechanics. The problem was a mysterious front end popping noise emanating from the front drivers side suspension area of my 96 Auto TT. When braking the brakes work fine; However, when I accelerate I hear a loud thump. I hear and feel it. It also clunks while gently accelerating and decelerating. The "lower control arm" bushings can wear to the point of actually tearing apart, and then the whole front wheel assembly can move back and forth when you brake and accelerate. If I accelerate in first gear, take my foot completely off the accelerator for a second and then press the clutch in, I DON'T get the noise. The vehicle is a Honda Civic SI '05 with standard 15" wheel tires. I am able to reproduce it most times by breaking relatively firmly with heavy steady pressure on the brake. ]I just bought a 2003 Kia Sorento. The left is too silent on the clunking fist of state power. This will cause knocking when you brake and go over certain bumps. Quite often when accelerating from a stop (usually fairly slow - I don't pound it), there seems to be a very slight delay and a bit of a "clunk" from the drive line. Clunk in Rear End: Bushing Diagnosis. I've had a clunk when re-accelerating after coasting for years, in fact, ever since I've had the D. To narrow down the problem the braking components, wheels and mounts of the vehicle should be inspected. It comes and goes but I've been hearing a single clunk sound when accelerating from a complete stop and when coming to a complete stop. Howling under acceleration at various speeds, however, indicates that the gears are already worn out or are out of alignment or depth with each other. And rolls down the road great. USUAL CAUSE The usual cause of this symptom is a defective Constant Velocity Joint. The clunk is a very loud make you cringe noise when under any kind of load after engaging 4WD. the tranny mount appears in good shape. It almost feels like when the clunk happens the rear of the Jeep shifts just a little to one side and the odd thing is it never happens when I take off hard, only when I ease the clutch out slowly. The sound is like a pinging or knocking at the back of the motor and only under load/acceleration. toyota: rear driveshaft/propeller shaft clunk/thunk noise. The axle wrap is a pronounce jerk feel when taking off from a stop. But if I come to a full stop and then start up again it can do it again, although not 100% of the time. When starting out or stopping it feels like the trailer moves back and forth inside the hitch clunking. Other common causes to a vibration on excell; - bad moter or trans mounts, allowing the engine to "ground-out" under force. Its a 2014 dodge ram 1500. The reason I am sharing is because there was a post or 2 in here with this very same p[roblem that was fixed via the suspension. This symptom only applies to front wheel drive vehicles. LR RWD, Build 3/2018. It shifts fine once rolling. Joined: Mar 27, 2009. toyota: rear driveshaft/propeller shaft clunk/thunk noise. 0l 5 speed with a 2"coil spacer lift makes a single loud higher pitched clunk when I start to move. I then hear this same sound when I accelerate from a stop, as well as when I quickly accelerate while driving. Also, the clunk is heard once when changing from forward to reverse. same problem here, *clunk* noise whenever I initally accelerate from rest, come to rest or on hard turns, seems worse the colder it is out. 07-21-2011 10:31 PM #1 If I drive or speed up any more then normal street driving, I get a very hard clunk that seems to be in on or around the transmission. The sound doesnt seem to be speed related and the lower gear I am in the louder the click is. If I stop, I get a clunk just before stationary, unless I flick to neutral and stop that way. It shifts fine once rolling. it doesn't matter whether i hit the accelerator or not, it's just when i'm in gear and just after i release the brake. It doesn't happen at higher speed/revs. I have a 1999 XCV70. A driver might not notice these signs in normal day to day driving but they become abundantly clear when driving up a steep hill or when quickly trying to accelerate into fast moving traffic. If I were to start the car right now and drive away it would not make the noise. Short of having a full tank of fuel, theres no way they wont be sucking air on a downline. So lately my truck has been making a clunk noise almost every time i accelerate. Noise is not present at higher speeds albeit turning is not as sharp. It is a solid clunk after shifting to R for the 1st time of the day and the car bucksvery noticeable! Then it drives normal. We demonstrate the first light sheet microscope using propagation invariant, accelerating Airy beams that operates both in single- and two-photon modes. It would only happen after a complete stop. sounds like it's coming from that general direction. This was driving me insane. There is a bit of lateral movement in the drivers side driveshaft, but the garage I've dropped the car off at are not 100% sure its a driveshaft issue, but is the first place to. A single click sound after shifting to drive and accelerating So on my new 4runner, I noticed a noise that happens only once, after the vehicle is turned on, shifted to drive and driven a few feet. My 2014 is clunking when I let off the gas after accelerating. later on after a few hours of the car at rest, i drove back home (just myself in the car) and the clunking noise was still there. A single knock/bump when accelerating from a stop I haven't had a chance to look under the truck yet, but last week I noticed this sound. You will get a single clunk once it reaches about 5-10mph. If i brake you will hear the noise as the front end of the truck goes down slighter, if i accelerate the noise appears when the truck's nose rises. the sound is almost as if the boot has nothing in it apart from a football bumping around inside. It was from 2nd down to 1st gear. Minor slip in first gear, or when engaging reverse sometimes. GM notes that this is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped. It might. wanted to get some opinions before bringing to dealership. The most recently reported issues are listed below. I was hoping someone here might. If I accelerate in first gear, take my foot completely off the accelerator for a second and then press the clutch in, I DON'T get the noise. Page 1 of 3 1 2 3 Next >. It is a single clunk noise, not multiple. My initial guess is that it's something with the driveshaft. I have a 2013 Camaro. The most noticeable is when I’m backing out from my driveway while turning the wheel; it reaches a point where the vehicle completely stops, if I continue to accelerate I hear a loud clunk and a sort of a bump (like if hitting another car) before it continues. It feels like it is loose or something is moving or shifting. The new C7 manual 7-speed transmission comes with a Dual Mass flywheel (also a twin clutch). I haven't replaced it yet, I've just been driving around with it unplugged. 2001-2003 F-Series/Excursion Returns to Idle on Acceleration: Some late 2001 trucks with the single connector accelerator pedal sensor, and 2002/03 trucks with non-adjustable pedals may return to idle on a hard acceleration. The noise became worse as the weather got warmer. Mine does this EVERY SINGLE TIME since day one. A clunk when going from engine braking to hard acceleration could be a transmission mount issue, a clutch issue, or (unlikely) a linkage issue (I say unlikely because, at that point, all the linkages should be taught and the synchros should be engaged). First dealer replaced drive shaft, then second dealer just installed a brand new trans. I have an 07 GT 5 spd, and I hear what sounds like excess gear backlash when I shift or accelerate and decelerate-a clunk sound. I have a pop/clunk sound when I begin to accelerate. I now have 105k on the truck and am still getting the clunking on occasion when braking and also when the load is taken off the drive train such as stop and go traffic etc. It doesn't sound metallic, it sounds like a pebble hitting a piece of plywood. Define norm. Sounds like its coming from drivers side. There is other noise that leads up to it, but its hard to describe, but it ends with the clunk. I offroad frequently and I am now having this same issue. I would hear a small single "clunk" now and then. It happens often, but mostly when I straighten out after a right turn, or when I accelerate from a stop in a left turn. One application of this teflon-based grease and the clunk is history. Happens more often when it's a jerky acceleration/decel. It was only one side in my case and perhaps any steering effect was dampened by the big tires, etc. Dealer told me it's normal and can be toned down via computer which they did and seemed to reduce the frequency of it happening. Sometimes these mounts are fluid-filled to provide even better smoothness, but the idea is pretty much the same. When this happens the slip yoke has a tendency to make a clunk. Help RAV4World members help you by providing your car's operating location in your profile page. This may be caused by the slip yoke not sliding smoothly on the transfer case output shaft. I notice that when I accelerate slowly from a full stop, it is smooth. Change the channel Select Site Singletrack Tech Singletrack Snow Singletrack Charged GritCX. 'Clunk' is a hard one. Doesn't happen during slow acceleration. There are a lot of opinions on what causes the clunk. I hear a sharp clunk noise when accelerating after a stop or near-stop. When braking the brakes work fine; However, when I accelerate I hear a loud thump. Inner joint failure is less common and often creates a loud clunk while accelerating from rest. It feels like it is loose or something is moving or shifting. Now there's a few miles, it comes and goes a bit with the brake dust, but it's still there. Since taking it home, I've been noticing a "pop" when I accelerate from a stop, whether I'm driving straight or turning either direction. Single "clunk" when accelerate Okay guys, so I know there's a lot of questions and topic about this, but I'm torn and hoping someone is having the same issue. If you do have a problem diagnosed with one, it would be wise but not necessary to replace both. For last 2-3 months I have heard an occasional clunk sound coming from right rear wheel area; sounds similar to someone clicking their knuckle once, fairly loud, a solid single "clunk". Rear-end squat during acceleration. A humming, grinding or hissing car noise can end up costing you. Engine knocking noise when accelerating The Unofficial Royal Enfield Community Forum website is a fan-driven project, not affiliated with Royal Enfield Motors. To narrow down the problem the braking components, wheels and mounts of the vehicle should be inspected. Driveline "clunk" often occurs in RWD vehicles when shifting between drive and reverse or when accelerating. Breaking hard, driving normally or accelerating doesn't cause this either. I just recently replaced the rear diff fluid hoping it was the problem. the sound is almost as if the boot has nothing in it apart from a football bumping around inside. I had a clunking issue under the same conditions you saying but it turned out to be a problem with the under brace I bought for my subframe, I bottomed out and I guess it shifted. After accelerating from a near stop, my SUV has clunking sounds coming from the transmission. do it when I back out of the garage, put the transmission in drive, and then accelerate normally. Re: Mild "clunk" in 1st gear when first accelerating I'm assuming this is a single "clunk" just as the truck starts rolling? If this is the case, I would grease the driveshaft spline and re-evaluate - this is a fairly common concern with many Ford trucks. I have a 2013 Camaro. LX470 vibration when accelerating, no vibration when not accelerating Lexus GX470 and LX470 thump, clunk from a stop or taking off – driveshaft binding 2006-2012 IS250, GS300, GS350 P0420, P0430 check engine light and/or car is loud – pinhole leak at y-pipe assembly. It started with a single loud "CLUNCK" sound while accelerating from a stop sign on a slight hill. Single clunk when I press gas after coming to a stop 4 Answers. If I push in the clutch and just turn the wheel there is no noise. it doesn't matter whether i hit the accelerator or not, it's just when i'm in gear and just after i release the brake. It happens only occasionally, specifically when I start to brake, accelerate or sometimes when I let go of the gas. It is set when the engine is built- by placing the camshaft and crankshaft in the correct relationship. Then an applied load may be varied via attached mass and released to simulate the step down (tip-out) response of the system. A bad CV joint can also cause vibrations at cruising speeds. I sounds like its coming from the rear end but I haven't been able to pinpoint where its coming from. Again, it's very slight, and I can avoid it by creeping to a stop or accelerating extremely slowly. Thumping or Clunk felt when car is IDLE or on PARK If this is your first visit, be sure to check out the FAQ by clicking the link above. Change it once a year. If you have not yet received a password reset, please re-issue one here: Reset My Password. That clunk was one reason I traded it rather than sell private party, but I did get 16,500 on trade with 80 k miles. They can take a crap and then the motor moves around and what's left of the mount can clunk things. day& heard a loud sound likensomething broke& then all of. A neighbor told me it has to do with the delayed. I'm really crazy about this car but I have the same issue with the clunk. The noise became worse as the weather got warmer. I had both of these done, but now there is a very scary sounding clunking noise (I think from the back of car) when accelerating over 25 MPH. The topic ‘Disturbing clicking/grinding noise under load when pedalling?’ is closed to new replies. Clunk when taking off (intermittent) - Page 3 - Toyota FJ Cruiser Forum Google search. Any loose bolts or worn joints can cause a single clunk under the right circumstances. Now there's a few miles, it comes and goes a bit with the brake dust, but it's still there. The ideas I have had so far are: - Rear A frame. It shifts fine once rolling. Driveline Clunk on acceleration Feb 26 2017, 12:33am Well, I search for a while and didn't really find a method to fix the issue on my 2011 Silverado 1500 2wd crew cab but did find ideas and happy to say, as of now, the problem is 100% fixed. Doesn't happen during slow acceleration. This was a pain to fit in, especially with J-OD. Big pain, I thought it might be the strut, but if its the steering column and I can lube it then that's a whole lot better. I now have 105k on the truck and am still getting the clunking on occasion when braking and also when the load is taken off the drive train such as stop and go traffic etc. Before removal, check the yoke to t-case out-put play. Has anyone experienced the same thing, and what is the problem / cost to fix. This is a class action brought on behalf of current owners of all 2004 through 2008 Ford passenger car and light truck vehicles sold in the United States and equipped with a 5. First impressions was I got my stock feel back! Nice and tight, no vibration! I want to thank Ralph for working so quickly with me and provided a permanent fix for my rig. So, accelerate, clunk, clunk, drive. It sounds like it's coming from the front drive. I have a 2013 Camaro. This is what I would do get the. My 2014 is clunking when I let off the gas after accelerating. I can feel it under my foot on the gas pedal, and it sounds like it's coming from that general direct. Short of having a full tank of fuel, theres no way they wont be sucking air on a downline. I own a 2007 prerunner with 147000 mi. -A Clunking Noise could be heard constantly while accelerating and usually while deccelerating Had car aligned and both the Steering and Clunking problems went away. If I stop, I get a clunk just before stationary, unless I flick to neutral and stop that way. Sometimes these mounts are fluid-filled to provide even better smoothness, but the idea is pretty much the same. Bought it with 60,000 miles on it and it has had the notorious slip yolk clunk since I've had it. 2 when putting it in drive and taking off or accelerating from a stop I hear a clunk in. I'm not convinced it's that big of an issue. I've redacted some info, but here is the repair ticket/invoice. The car is being f**king horrible when accelerating, just pulling to the right mainly, steering wheel juddering when braking and pulling it from my hands and now i seem to have developed a clunking noise when changing gear. A humming, grinding or hissing car noise can end up costing you. I know THAT sound. When accelerating I sometimes get a clunking sounds from shaft. The National Institutes of Health (NIH), pharmaceutical companies and nonprofit organizations have together created the Accelerating Medicines Partnership (AMP) to develop new ways of identifying and validating promising biological targets for diagnostics and drug development. The axle wrap is a pronounce jerk feel when taking off from a stop. Another difficulty is discerning where the sale and transfer of ownership occurs when the transaction is made online. If i accelerate very slowly I can barely hear it, but if I accelerate a bit quicker it is more noticeable. I know a felt clunk would help, but lots of people just run a standard clunk. Jeep Patriot owners have reported 22 problems related to transmission noise (under the power train category). Had similar on my MX5 and it was a single knock when touching the brake pedal then another when pulling away. It doesn't sound metallic, it sounds like a pebble hitting a piece of plywood. Change the channel Select Site Singletrack Tech Singletrack Snow Singletrack Charged GritCX. I shift into forward, the boat rises up and travels 10 to 20 feet and I feel the single slip, then past that it is running fine. There is a loud clunk when I turn left only when accelerating. This is a fairly significant clunk and can often detect it with your right foot as it rests on the floorboard. It happens often, but mostly when I straighten out after a right turn, or when I accelerate from a stop in a left turn. If you hear creaking, popping, or clunking sounds, the possible culprits are broken or worn out suspension joints. You hear a single knock or clunk from the engine bay when first accelerating. That's unacceptable and it's a software problem, not a hardware failure. When I accelerate from a stop, I hear a loud clunk. YACT: Clunk from the front wheel area on acceleration, sometimes. Unfortunately it did not. I took the Acadia to the dealer yesterday and was told this is a problem that is in all of the V6 motors and was taken for a ride in a Buick enclave and it did have the same problem. Thread Starter. It occurs under hard acceleration and also just when accelerating normally. Call it a clunk or a crunch or really loud pop. If instead I hold the vehicle with the brake so it cannot move when I gas it there is no clunk. So lately my truck has been making a clunk noise almost every time i accelerate. So I’ve been getting this creak/light thud, usually just one, upon braking, downshifting while slowing down, and sometimes on acceleration usually from a stop. Soooo,, When I release clutch to take off (whether 1st or reverse), there is quite an audible single pop/clunk. If any of you have had this same issue, please chime in as to what fix is necessary. Here's what I do: I put it in Reverse, back out, come to a full stop, shift to Drive, as I step on gas and the car slowly starts to accelerate, I can hear this "clunk" sound from the bottom of the car. I have just purchased a 2012 Acadia LT1 and am having a problem with a rattle when I accelerate from a stop. On accelerating, at any speed, there is a single clunk/knock each time that I can feel in the steering wheel and pedal. It feels like a series of small slips and bumps, two maybe three bumps. I do not hear it every time, but definitely do when taking off with some power. The compact and light-weight single ram power, trim and tilt (PTT) unit and bracket have been developed exclusively for this engine. USUAL CAUSE The usual cause of this symptom is a defective Constant Velocity Joint. The introduction of the DMF on the '89 Vette was the first use of its kind in a passenger car. \'91 Golf 1. Recently, after towing my trailer, I noticed a clunk during acceleration. My Bronc has a clunk too. Results indicated that behavior skills training had a positive impact on the paraprofessionals’ use of the strategy. It sounds like the noise is coming from the dirveshaft or the rear end maybe. A static torque is applied to a driveline system via the mass of an overhanging torsion bar and electromagnet. So my 05 xb12 has developed an odd clunk in third gear only. Single "clunk" when accelerate Okay guys, so I know there's a lot of questions and topic about this, but I'm torn and hoping someone is having the same issue. Space between the company where you can continue pursuing your claim. When I stop and then accelerate within the first few seconds of the acceleration I hear the clunk clunk sound and then it goes away at all speeds and only happens when I stop and go. To narrow down the problem the braking components, wheels and mounts of the vehicle should be inspected. It feels like it is loose or something is moving or shifting. When I go from a coasting in the Traverse, and then accelerate (lightly or heavy) I hear a quick clunk. I get a clunk sound from the front right when i brake for the first time while moving in reverse. The thump does not occur at stops or shifting. Built with SMF Tricks. I don't hear it while in neutral and revving the engine, but when accelerating in gear from a stop I hear it. If all else fails make sure your subframe is on correctly. Zen I have a Honda civic 2005 that makes a single clunking noise. Based on the posts above, I ordered the spec B rear diff mount, and I put it in last weekend, and it fixed the clunk noises. This noise only comes when the brakes are applies softly, just enough to slow the car down. Call it a clunk or a crunch or really loud pop. If I push in the clutch and just turn the wheel there is no noise. It happens often, but mostly when I straighten out after a right turn, or when I accelerate from a stop in a left turn. Re: Clunking Noise The subframe bolts should be an easy check, get a long prybar and a socket and torque those bad boys down, if you hear the clunking when turning/braking it could very well be a CV (this is like the 4th cv post i have had today wtf). If the car makes noise when turning at low speeds, look into the power steering system or the suspension. Brake clunk under slow stop situations - update As some of you may recall, I was experiencing a clunk from the front brakes when coming to a slow stop at speeds under 5mph. Once I reach a certain speed, say 5-10 mph, I get this loud clunk from front of car. These are rubber boot-covered universal type joints (CV is constant velocity) located on your two front drive axles. 6l Golf Driver. Ignition Timing Explained/Timing an Unknown Engine by Michael Shiffer. When I turn off the A/C it stops. A humming, grinding or hissing car noise can end up costing you. It coincides with the moment the tires hit the road. It is set when the engine is built- by placing the camshaft and crankshaft in the correct relationship. I'm not convinced it's that big of an issue. The sound is coming from the front and only happens one time after braking for a stop. When I'm riding, regardless of speed, I'm hearing a loud clunk on and off the gas. When we pull up to a stop sign or stop at a red light then accelerate when it is time to drive, the vehicle makes a sort of clunking noise. I hear and feel it. This may be caused by the slip yoke not sliding smoothly on the transfer case output shaft. So lately my truck has been making a clunk noise almost every time i accelerate. That's unacceptable and it's a software problem, not a hardware failure. 0l 5 speed with a 2"coil spacer lift makes a single loud higher pitched clunk when I start to move. My 2014 is clunking when I let off the gas after accelerating. These common car noises can spell trouble and cost a lot of. Ford Five Hundred/Mercury Montego: Noises. It only happens later in the day after I've been driving my car for a while. It happens often, but mostly when I straighten out after a right turn, or when I accelerate from a stop in a left turn. It almost feels like there is something hitting my tailgate as I take off. The truck however, is a LOUD CLUNK, then as the turn continues you still hear it though not as loud. Well, the new drive shaft fixed it for me. (Both CV axles were replaced a year ago). ), or when accelerating from a stationary position. I really notice this when turning left, and I don't ever recall hearing it when turning to the right. it was very frustrating because I first starting hearing a slight noise when my truck warranty was just about to expire at 35,500 miles. Have noticed a single "clunk" sound coming from the rear of my TB when doing a fast acceleration from either a slow speed or complete stop. One of the most common first indications of a problem with your car is a Clunking Sound heard while driving. Here's what I do: I put it in Reverse, back out, come to a full stop, shift to Drive, as I step on gas and the car slowly starts to accelerate, I can hear this "clunk" sound from the bottom of the car. They can take a crap and then the motor moves around and what's left of the mount can clunk things. The only cure to that specific problem is switch out with standard flywheel/clutch assembly (Z06 alum flywheel and clutch is a popular mod). If the click or the clunk only happens when you drive over a bump or a dip, it's probably related to the suspension or the body shifting. Not super loud, but there almost every single time. Driveline Clunk I went over everything under the truck on a friends lift a few weeks ago and we did not see any loose mounts, or u-joints etc. Sounds like its coming from drivers side. Hard up/downshifts would also elicit a clunk. You may have to register before you can post: click the register link above to proceed. A laboratory experiment is designed to examine the clunk phenomenon. I have kinda sorted some leaks etc, but I am lost with this clunk!!! The clunk is double - when the clutch is released and accelerator depressed to accelerate, there is a loud clunk clunk coming from somewhere, The clunk clunk also happens if traveling and the accelerator is quickly depressed. The harder I accelerate the harder the thump. This usually occurs in one of the following situations: 1, Under heavy braking - Its almost like something 'gives' when there is a load on the front suspension during sudden heavy braking. But it will do it multiple times in a single pedal push - like 3 or 4 times depending on how hard I accelerate. Single clunk when I press gas after coming to a stop 4 Answers. It's not gear changing related but feel it when I'm accelerating and deaccelerating. The acceleration of acceleration: It's a bit like climbing a mountain and receiving a jetpack. A clunking noise might be heard as well. I also experience the "clunk" sound when accelerating from a complete stop. It clunks when you put it on Reverse, and then accelerate. Mercedes-Benz owners may complain of a single throttle lift-off clunking noise from the side shaft when first taking off (audible at the outboard end). Zen I have a Honda civic 2005 that makes a single clunking noise. 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. It has recently started to make a single knock or clunk sound when I accelerate and brake. Clunk on acceleration. Worn suspension parts can also be a cause of a knocking sound when braking. Generally this only happens at lower speeds - I've never driven the car hard either. This only happens in reverse and occasionally. I have the the clunk noise coming from the right front of my car. I had a clunking issue under the same conditions you saying but it turned out to be a problem with the under brace I bought for my subframe, I bottomed out and I guess it shifted. tighten to 50Nm If the sound goes away, you may want to replace the bolt with the ones from XC90 which has rubber grommet to prevent clamping loss.