e-mail fed up with construction noise coming from. I believe this started when I made a hard left u-turn, I heard a load snap noise (like a bolt being stripped), the noise vibrated through the whole vehicle. It's not the typewriter tick, that's for sure. Doesnt sound like the up top bnoise of the lifters. After hearing the knocking noises, the always changing the oil, and now car shutting off, why must I subject my self to paying 1000-2000 for the car to do the same sh*t to me. It is a lot better than having it pop off on you in some godforsaken situation, and it's cheap insurance. With the 5 speed now, unless I ease of the gas reeeeeeal easy it will almost nose-dive. In any case, I talked to an old retired mechanic the other day and he said it was nothing to worry about. I'm used to getting launched around if I actually 'take off' and the tune kicks in, but not when the engine idles/downshifts after you let off the gas. You can fix a gas dryer that's letting you down. The recall affects Jeep Patriot and Jeep Compass four-wheel-drive vehicles from the 2012 model year. On further inspection (my neighbor's ears while a step on the gas) it does not seem to be an internal engine issue but instead a rattling heat shield somewhere on the exhaust path. Does the knock happen when you accelerate, coming in around the shift points? Then go away when you let off? If so, I'd suspect broken piston skirts. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. It sounds like an airy squeel, or shreak. just picked up a second hand car. Whenever I'd get on the gas or whenever I'd break, it would stop. Knocking or more of a clunk, read for details (yes I searched) 1 Answer. Read the Gas Stove Won't Stop Clicking discussion from the Chowhound Cookware, Stoves food community. a "knocking" noise could be your lifters. Detonation, Pre-ignition (Pinging) Noise You usually hear this noise when accelerating the vehicle. I don't hear it while in neutral and revving the engine, but when accelerating in gear from a stop I hear it. It strangely disappears as soon as you let off the gas, and you might not hear it at all on light acceleration. So, how do I get rid of groaning pipes? Not water hammer, so must be air in pipes or something else going on I guess. If I press the gas pedal it goes away, but as soon as I take my foot off the gas it is back. It doesn't seem to be the brakes. :icon_confused:. This is a semi major job for most of these engines and would usually cost in the four digit range. It happens as soon as I take my foot off the gas and it is definitely more prone to happening at speeds of 35MPH or slower. The last motor I had start that lasted about 7 miles before throwing one rod, breaking it in three pieces, and loosening the one adjacent it up pretty good. It's cold out so I've been letting my 2010 warm up fully before driving. Truck shakes slightly no stalling. I have drag pipes, and points which of course is a dual fire system, so when you let off the gas it has a wicked down lash sound. Mine ran like a POS below 3200. I noticed that there was a tapping noise in the front end when I let off the gas. I have the gold preferred extended warranty but of course they say THIS is not covered. When you let off the gas, it continues and maybe even gets louder. I don't think it's a rock in the brakes, since it doesn't make the sound when letting off the gas and braking doesn't change. Just bought my first bike, 2001 KTM exc 250 2 stroker. It is important to note that the sharp, loud, tapping, knocking noise disappears immediately upon deceleration (letting up on the gas pedal) or as the vehicle gets up to speed. I have a 2008 EX automatic. I don't hear any sounds until I take it close to 50 mph and let off the gas pedal, in which case I will hear a knocking sound. There are plenty of gas pumps and parking. Do I have the water temp too high causing it to pop inside. Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. A loose mounting can cause knocking noises from the compressor area that may be mistaken for internal noise. Sounded like it is coming from the front passenger side. The car is a 2004 Saab 9-3 Aero. Only thing is that the fast idle upon startup is a bit too high at 1500 RPM+ so the car wants to take off a bit if you don't let it warm up a minute before putting it in gear. When letting off the gas it goes away. Knocking within. It's not the typewriter tick, that's for sure. That is the switch. I am having a similar problem. The noise will speed up or slow down but nothing makes it go away. I don't hear it when stopped, but whenever the car is moving if I'm not pushing the gas I hear the knock. It makes noise when i accelerate, but even more noise when i take my foot off of the gas after the acceleration, but is usually quiet when the car is at a stop. Also stated above, it's tough to diagnose a sound without being able to actually hear it. Abnormal combustion, more commonly known as knock or detonation, has been the limiting factor in internal combustion engine power generation since the discovery of the otto cycle itself. You can fix a gas dryer that's letting you down. Re: whining noise Remove the drive belt, put the cart in neutral and spin the secondary clutch in both directions , if it is smooth and no noise, its not your in your in the rear end, I had what sounds like the same problem and after doing the above steps discovered that it was coming from the input shaft on rear end, turned out to be just a. It's not bad at all though It sometimes just makes a little wabble noise, kind of like a knocking noise, but only when i let off the gas and only for a really really REALLY short time. What Does a Knocking Noise Mean When I Apply the Brakes? A knocking sound when applying the brakes could indicate different problems, such as loose calipers, bad shock absorbers, worn constant velocity joints and failing tie rods. Re: When i let off the accelerator, there is a clunk ? Most likely a gearbox mount (normally clunking after acceleration is the rear one as that is the one that takes the load under acceleration, more noticeable in lower gears because the torque forces are greater). but as soon as i get back on the gas it goes away. when they test drove the car it was fine a little while later it would come back. At one point, it sounds like the knocking noise nearly disappears. I've read that manual's have a vibration when letting off the gas but mine's an auto. I have noticed that when my 12GS gets pretty hot (like if I have been idling for a long time) that it makes a pretty loud knocking noise when getting started from a stop. 99 GSX, when I am driving it, let off the gas and let it come to an idle it will idle fine for about 15 seconds then it will start a rattling/knocking noise and you can acutally feel it. One HART CNG van is estimated to reduce CO emissions by 9 tons per year. It sounds like a whining or grinding sound (sounds like its fron right under the driver seat) but only if the gas pedal is pressed. My "98 Honda Civic EX (manual) is making noises when I let off the clutch giving it gas. when standing or walking along side the car while somebody else is driving is very hard to hear the noise if at all (at least in my case). You can look in the bottom of the gas tank and see water "beading" around if it's present. Just in the last 3. Not sure if this is normal or not, but I thought I would ask. I've started to get a ticking sound out of the engine the last few weeks. A flooded cell battery on a charger or charging system that is seriously overcharging the battery causing the electrolyte to off-gas can also cause a hissing sound as the gas is forced out of the. By sending warmer gas into the combustion chamber, the air/fuel mix does not have to do as much work to heat up, and your engine runs more efficiently. I notice that I still baby the bike due to the "knocking" if I get on it without earplugs. My truck makes a knocking noise when I step on the gas but only when at a constant speed or letting off the gas, - Ford F-150 F150 Crew Cab Exterior question Search Fixya Press enter to search. If I accelerate, you dont hear the ticking noise much until I let off the gas enough to keep a constant speed and the ticking becomes constant with the motor. Re: Clicking noise during acceleration and decceleration Mon Apr 01, 2013 9:12 pm So from what I understand an issue that will probably end up impacting every LEAF is a clunking sound which occurs just once when changing directions (forward to reverse and reverse to forward). Do any of you L5P owners notice a tapping or knocking noise that is synched with engine rpm when you let off the accelerator and coast? It only seems to happen between 1,000 and 1500 rpm. I have been driving it like that for probably 5,000 miles (since January), so I feel like at this point I would get a CEL or something if it was detrimental to the. When you let off the gas, it continues and maybe even gets louder. I mounted a camara under the trunk with view to suspension, but the engine noise was too loud. The Ram pickup is a full-size pickup truck that is marketed as the Ram Trucks brand. Related Articles. Worth a shot and not that hard too change 1st time took 2hrs per side roughly. If you suspect that there might be a problem with your clutch there is an easy way to determine whether that’s where the issue is. I did many figure 8's and fairly severe donuts in a parking lot and it only did it couple times. However, with foot back on the gas pedal, noise disappears completely. Then, take it somewhere and have them beef up that hook with a little welding job. Readers, if you've experienced a similar sound when starting your car (whether or not you got that knock to knock it off) -- join the conversation. The rattle peaked when letting off the gas pedal at 1500 RPM’s in any gear. However, when I let out of the accelerator, I hear (what sounds like) a metal on metal rattling sound coming from the back or middle of the truck. Then, testing what was going on, I gave it some gas. However, if I touch the gas pedal even lightly the jerking goes away. Read on for effective ways to track down noises, both outside and inside the cabin, and what can be done to correct them. Going from drive to reverse usually does it. My clutch burned out. Now, if you speed the motor up, the knock is completely gone. Re: Knocking or Hard Rattle In Outboard I have done the shifting by hand since i just recently replaced the shifter cable. Weebly’s free website builder makes it easy to create a website, blog, or online store. Could be something wrong with the impeller, wastegate or vacuum lines. I do not think I would return to repair guy that said knocking was ok. Not too sure. The noise is virtually unexistant untill I start to go forward and forward only. You can also inspect the mounts to see if they are old and worn out or not. Worn or otherwise compromised drive belts are a common cause of noises when accelerating. 3 weeks later (now) it does it much more loudly and it does it under acceleration AND deceleration. Anyway, I noticed today that when you leave the car in first and then slowly raise the rpm to that range, you obviously get the sound, but when you're letting off the gas, you get the expected large amount of engine braking, as well as the sound. The engine will then make the knocking noise on the next startup if you let it sit for an hour or so. Changing the gas. Promaster has the 3. Check for the bell housing bolts to be tight. It SOUNDS like the light metallic tap of a fan nicking the shroud. Does this mean that my rods are loose? I adjusted the valves about 3500 miles ago. 3 L engine, there is a knocking type sound as soon as the engine is started and the speed of the "knocking" follows the RPM. It doesn't ever get better on its own, although when your engine is cold, the noise might be lesser. so now im thinking its something in the clutch. When I am at a dead stop, no knocking. Gear Noise Upon Deceleration Need Help (Updated) O. It’s easy to focus exclusively on gas mileage when making an environmentally conscious car choice. My 95DX with 82k and auto trans has begun to make a click/clunk sound when I hit the gas hard and/or let off the gas suddenly. A new noise has been coming from my engine since Sunday. Also, when you go to the bathroom, you here the same sound like running water enveloping the room. Chevy machanic did not know what it was. however, today i had to put the windows up and the whine is very loud when i let off the gas and the car is lowering through the rpm band on its own. it was knocking before the replacement. Flynn told me to be ready to go early, to be dressed to get dirty, to pack a change of clothes and that he would come by in his Pontiac Lemans convertible and pick me up. They have a large selection of gifts, souviners, clothes, drinks and snacks. How can I be sure that it is in fact a rod. It seems to be directly related to the wheel rotation but seems to happen the most when i let off the gas. The boiler is new, heating system not. I hope that - whatever the nature of our relationship is or has been, however we met, how long we've known each other, whatever - I really hope that I have stored up enough cred with you that I can be frank about a couple things that have been eating away at my brain for the past few months. MechanicAdvice) submitted 4 years ago by TrueBlonde Like the title says, I'm hearing a knocking noise whenever my foot is not on the gas in my '99 Integra LS. 5 hours after my initial call). If you blip the gas it will go away immediatily then come back 10-15 sec later. About 10 miles ago the truck started making the same noise but now it making it at idle and on deceleration, as well as all rpms while the other injectors are stopped letting the engine slow up. Others are a bit more. Also, when letting off the gas in town it'll down shift hard and have a noticeable knock. I still have the noise but it seems less "loud" since putting 2,000 miles on the car. its only happens when i give it gas and it seems that when i get to 50 kph and let go for a second it takes a long time to get back up to higher rpm. We'll when I started driving the knocking became louder, but when I let off the gas it stops. Junkyard dogs October 28th, 1989 Saturday. I was driving on the interstate one. when standing or walking along side the car while somebody else is driving is very hard to hear the noise if at all (at least in my case). It idles quietly, and can drive under 45 mph. A back-fire or backfire is combustion or an explosion produced by a running internal combustion engine that occurs in the air intake system rather than inside the combustion chamber. If you blip the gas it will go away immediatily then come back 10-15 sec later. I have the 2. The noise will speed up or slow down but nothing makes it go away. That is the switch. In much the same way, No Rock & Roll Fun has been depopulated for generations, and its comments areas reduced to being used for testing ballistic bollocks of SEO spam, but on this one, very special day, we're allowed back inside to mark the occasion of Eurovision. Four days later I was operating on a city street when the same type noise occurred. It has a bad knocking sound. If that were case why would it not make noise all the time. Maybe it's my driving style. Guys my 1992 NSX is have a weird issue, its never done this before, when I press the gas everything is normal, thru 0. I don't know if it's the transmission or what. Can hear it almost like a knocking / gurgling sound initially, but get out of the car and it has that fuel going down a pipe type sound In my case the noise is caused by the fuel tank / system / pressure causing the noise. Same thing over the speed humps. I believe this started when I made a hard left u-turn, I heard a load snap noise (like a bolt being stripped), the noise vibrated through the whole vehicle. Whenever I'd get on the gas or whenever I'd break, it would stop. basically, when i press the gas to accelerate normally and when im letting off to coast, i hear a knock sound around the passenger side. check your oil and if it's full then you may need to think about either. I've started noticing a clunnking noise (rather loud) when I lift my foot off the gas. Yakish pulled over in a gas station parking lot promptly, got off his bike and put his hands up. By category and class: 1 Advice on the insurance company guidelines Members and seniors in louisville were from strangulation That the car as this with a broker instead and see what kind of guy Company must ensure that you will be free of charge When adding to shopping collection 29 Idea caused a huge dragging noise To use gas for the right. I notice that I still baby the bike due to the "knocking" if I get on it without earplugs. My Acadia SLT has recently been making a rattling noise when turning left and during acceleration. Either you fix it yourself or you call a pro to repair it. Re: Hearing knocking noise when turning leftHELP PLEASE. I was driving it the other day and after i stop i started to hear this knocking noise coming from my engine. I park indoor at home and at work so I would have noticed easily if it did. This humming remains when trying to hold speed at say 40km/h, and even sometimes remains when letting off gas and truck is downshifting. Re: Clicking noise during acceleration and decceleration Mon Apr 01, 2013 9:12 pm So from what I understand an issue that will probably end up impacting every LEAF is a clunking sound which occurs just once when changing directions (forward to reverse and reverse to forward). I test rode the same style bike at an event at our local dealer last year. Exterior; Aerodynamic halogen headlamps; Clearcoat paint; Fog lamps; Headlamps-on alert chime; Wrap-around taillamps; Heating, Ventilation & Air Conditioning; Manual air condition. 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. Why is the 1997 Toyota Camry making a knocking noise when the foot goes off the gas pedal? We use cookies to give you the best possible experience on our website. Knocking noise is not normal and anything that is rubbing hard enough to make noise you can hear above the engine is wearing something extremely fast. I let up off the accelerator to see if the noise would change, which it did. I've started to get a ticking sound out of the engine the last few weeks. So I propped the front end up on jack stands, loaded the driver side suspension so that it came up off the jack stand, started the car, had my wife turn the wheel both ways and push on the gas, no knocking sounds. 2L, 4x4 grand cherokee. I have an evinrude 140hp 4cyl (1990) as I way underway engine sounded louder & louder ,sounded just like engine knock, when I slowed down and put it in nutreal engine runs fine, even at high idle no knock but when I put it in gear it sounds like the prop is hitting a zinc. Any ideas would certainly help. The water may come out in spurts, it may make all sorts of noises, and takes some time to flow out. Get exclusive film and movie reviews from THR, the leading source of film reviews online. Do any of you L5P owners notice a tapping or knocking noise that is synched with engine rpm when you let off the accelerator and coast? It only seems to happen between 1,000 and 1500 rpm. The noise is very loud and does not sound internal. The Causes of Internal Engine Knock, and How to Eliminate it. To me it sounds like some kind of water restriction, but dunno. I've got a 2011 Bonneville T100 and when I release the gas and the tach spins down to ~2900-2200 RPM I get this weird noise that sounds like misfiring. Engine knocking refers to the metallic sound an engine can produce when pressure is applied to the gas pedal. knocking noise on right passenger side when i let off the gas front passenger side wheel is knocking very hard but - Ford 2000 Focus question Search Fixya Press enter to search. Excess is routed back to the tank. With an exhaust leak, the muffling of the noise is cut short, making the noise louder. I did reuse the same K&N oil filter by letting it drain in the drain pan during the second oil change. Re: Clicking noise during acceleration and decceleration Mon Apr 01, 2013 9:12 pm So from what I understand an issue that will probably end up impacting every LEAF is a clunking sound which occurs just once when changing directions (forward to reverse and reverse to forward). Although this hissing noise, sounds like a bad noise, it's actually a good air conditioning noise. If you take the drive belt off and/or use neutral it places no load on it, so that may well change the sound if its the clutch doing it. Then the CEL continues to blink for a short time and goes out. Our technicians tell us this condition is commonly caused by a failed automatic transmission torque converter. When letting off the gas petal it makes a knocking banging noise, started a couple days ago and is coming from the lower - Answered by a verified Jeep Mechanic. Please keep us updated on the knocking noise issue. I own a 1995 Honda Civic CX with 122,000 miles on it. Is the clunking noise a consistent knock, or is it only when pressing on and/or releasing the gas in that speed range? I do get a knocking noise if I'm lightly accelerating in that range and quickly let off the gas pedal. now when I rev it up to about 2000 and hold it there, the back pipe is powing alot and it has the same sound as when letting off the gas. The A frame bracket that sheared off illuded me for a while, as the noise wasn't very noticeble when driving, just a low clunk, and wasn't able to be seen unless you laid right under the rear axle. I am also experiencing this noise. And I heard a clanging noise and looking behind my car and saw something black and small. I was less than 2 miles from home, so I decided to take it slow back to the house. i always drive with my windows down so i never really heard it. the load felt huge and i was sure it would fall out but it stayed inside my panties. The company says the SUVs have saddle-style gas tanks that go around the rear drive shaft. CLiCking Noise whenever letting foot off the gas pedal. Knocking or more of a clunk, read for details (yes I searched) 1 Answer. If you are hard on the gas or stoping quickly, you will never here this. Just last week i was leaving work on a very cold day and my truck was making an odd noise, it is a loud ticking knocking noise that gets louder as RPMs rise. Not too sure. This is something I listen to everyday,and they could not find or hear the noise 1. i figured it was normal. Long story short, they had my truck for 7hrs and the tech said the noise was normal and sited a TSB number. I am having a weird knocking sound when I let off the gas and it goes back to idle. I have a 2005 Kia Rio Wagon, Automatic. ok, so my car is making some funky noise. When listening to the noise from inside the car, it does appear to be coming from the central area of the engine compartment, but it's not, it's coming from the top strut bearing. Everything was ok driving slowly but on the highway doing what you described would cause my knock gauge to light up when I let off the gas. Is this a common problem? The knocking noise appears to be coming from top of the engine. I've got a 2011 Bonneville T100 and when I release the gas and the tach spins down to ~2900-2200 RPM I get this weird noise that sounds like misfiring. The car is a bone stock 2006 RSX-S. Re: When i let off the accelerator, there is a clunk ? Most likely a gearbox mount (normally clunking after acceleration is the rear one as that is the one that takes the load under acceleration, more noticeable in lower gears because the torque forces are greater). Normally cruising on a flat road will let out the noise at a lower level than when climbing a slight hill for example, but it is always hearable as long as the gas pedal is depressed (engine under load). It sounds like it's coming from the front driver side. I shan't go into the technical talk he gave me, but he concluded that it all stemmed from my letting the car "set up" in the garage for three weeks with a nearly empty fuel tank. I own a 1995 Honda Civic CX with 122,000 miles on it. Natural gas produces 30% to 40% less CO 2, which is a greenhouse gas, and carbon monoxide (CO) is reduced by more than 90%. 95 integra LS. Has always done it. :icon_confused:. I just got a 2015 Toyota Camry. What does it mean when there is a knocking noise from the engine when you let off the gas? cruising but make a. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. With the 5 speed now, unless I ease of the gas reeeeeeal easy it will almost nose-dive. asked by Joseph on March 02, 2017 When I'm driving and there is momentum transfer while the car is in gear it makes a clicking noise around the axle area I believe if I decelerate with the car in gear just letting off the gas it clicks thenis fine if I decelerate with the car in neautral or with the. This discharge can manifest itself as a clicking sound. I'm guessing the gas sloshed forward and thereby creating an low fuel load in the tank momentarily. so now im thinking its something in the clutch. Although I must agree that some of their Outsource Parts aren't up to par, I have still experienced minimal issues. Make sure that the gas is connected and the pilot light is lit. Chrysler says it's aware of one crash but no injuries or fires due to the problem. Maybe it’s the freshness of working within such purely hard rock idioms that help these normally uptight black metal musicians rid the music of its inherent clichés. Hilarious video shows a VERY polite cat knocking on a door in a bid to be let in on a shopping spree with a Scott Disick look-alike Fresh off her and Meghan over gas-guzzling. Keep checking it with the rag and dipstick after adding small amounts of oil. Does the knock happen when you accelerate, coming in around the shift points? Then go away when you let off? If so, I'd suspect broken piston skirts. believe it or not it does work when in the city or a lot of stop and go I turn off the overdrive and no clunk. A blowoff valve, (sometimes "hooter valve" or BOV) performs the same task but releases the air into the atmosphere instead of recirculating it. It happens as soon as I take my foot off the gas and it is definitely more prone to happening at speeds of 35MPH or slower. As the miles have been put on the car, what I THOUGHT was a rear end clunking is actually more closely related to the transmission. Ok I did a lot more listening today the tone of the engine changes at 2200 on its way up. Proper oil used at each oil change, dealer by previous owner or by me. wanted to get some opinions before bringing to dealership. We have 11949 miles on our 18 Sahara JL Jeep. If it quits knocking with a wire off, you've found which cylinder it is. Now, if you speed the motor up, the knock is completely gone. I have checked the front and rear DS and the ujoints have no visible play. The water may come out in spurts, it may make all sorts of noises, and takes some time to flow out. Try this, when you cruz'en down main street push the OD button to turn it off. It was really bad this past fall when I was stuck in traffic for an. It had less than 10 hours on it (bike actually looks brand new) and was purchased in 12-09 by original owner, and I didn't notice it when I picked it up, but my son noticed it today, so we started paying. I just started getting a knocking sound coming from the rear somewhere. recently during really heavy rains we can. Symptom: When gas pedal is depressed, regardless of the car's momentum, I can hear a very fast clicking or more animatedly described, a turning tick from a "wheel of fortune" wheel or like a very light 007 semi-auto pistol going off on full auto. Anyway, I noticed today that when you leave the car in first and then slowly raise the rpm to that range, you obviously get the sound, but when you're letting off the gas, you get the expected large amount of engine braking, as well as the sound. Well it seems that there is a gap, and once that (whatever is making the noise) is torqued in one direction it won't pop again until I torque it the other way. It has roughly 3k miles on it and I just had it fully serviced with new valves/adjusted and carb cleaned about 150 miles ago. 2013 ST: making a knocking noise from drivers side front when getting on/off throttle. Pipes in your bathroom wall are making a knocking sound every time the toilet is flushed. As far as fixing it yourself, it's an electronic part. Car runs good. i always drive with my windows down so i never really heard it. At one point, it sounds like the knocking noise nearly disappears. Trans has been flushed on a regular basis and fluid has always been pink. It seems to be coming from behind me; towards the rear-end. Is my driveline just off balance?. I took the bike for a 4 mile spin the next day. I did many figure 8's and fairly severe donuts in a parking lot and it only did it couple times. 0 mph to 45 mph speeds after 45 if you press the gas all is well but when you let off the gas and the car's speed drops you hear this thumping sound. It is a lot better than having it pop off on you in some godforsaken situation, and it's cheap insurance. I've completely re-done my rear axle and suspension and it has taken me FOREVER to get it all back in the car due to lack of time. It is worse when idling and right when I let off the gas. With 28 CNG vans in operation in 2014, HART will reduce these emissions by 252 tons per year. I hear a sound like that in my '97 Legacy GT sedan. Detonation, Pre-ignition (Pinging) Noise You usually hear this noise when accelerating the vehicle. Check Engine light came on after picking it up from the dealership after a connector was replaced. asked by Joseph on March 02, 2017 When I'm driving and there is momentum transfer while the car is in gear it makes a clicking noise around the axle area I believe if I decelerate with the car in gear just letting off the gas it clicks thenis fine if I decelerate with the car in neautral or with the. Stepping on the gas and accelerating stops the noise. 2 issues knocking noise and loud pop noise too~ I have an 2007 Envoy Denali purchased in February of 2007. Once I get on the highway it doesn't make the noise, doesn't matter if I hit a bump or not. 2012 BMW 328i with about 9000km. So, how do I get rid of groaning pipes? Not water hammer, so must be air in pipes or something else going on I guess. So I propped the front end up on jack stands, loaded the driver side suspension so that it came up off the jack stand, started the car, had my wife turn the wheel both ways and push on the gas, no knocking sounds. and you've got a tick that drops off as the bike. i took the car in for service and was able to demonstrate the problem to the mechanic. I noticed that there was a tapping noise in the front end when I let off the gas. The A frame bracket that sheared off illuded me for a while, as the noise wasn't very noticeble when driving, just a low clunk, and wasn't able to be seen unless you laid right under the rear axle. Join the discussion today. When you push down on the gas pedal, that's when you hear it. Howerver, always check the mounting and brackets before condemning the compressor for noise. Was driving it yesterday and when you let off or ease up on throttle the is a knocking noise that sounds like coming from r-side of front end. For all of you out there contemplating whether or not your engine has a cylinder sleeve problem, I have seen the resultspretty much looks like a hand grenade went off inside the motor. Identifying Weird Car Noises. “It must be said that the album's 12 gas-guzzling hard rock anthems are pulled off with astonishing confidence and what seems like surprising ease. It only does it when letting off at 80 now. I am hearing a clunking/knocking noise when I accelerate and decelerate, especially in lower gears. Worn or otherwise compromised drive belts are a common cause of noises when accelerating. Drove the car to Nags Head this weekend and about 3/4 of the way there when I got into some 45MPH zones, I noticed a clunking when I would let off the throttle only. Check the exhaust system when the engine is off for several hours. I first heard it on the freeway but it was only when I would let off the gas it would start making that sound. I let up off the accelerator to see if the noise would change, which it did. so now im thinking its something in the clutch. Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. As the miles have been put on the car, what I THOUGHT was a rear end clunking is actually more closely related to the transmission. I used a hose to try and isolate the noise and it seemed like it was in the pan. If you are hard on the gas or stoping quickly, you will never here this. One HART CNG van is estimated to reduce CO emissions by 9 tons per year. I don't hear it when stopped, but whenever the car is moving if I'm not pushing the gas I hear the knock. I am having a problem with my 2004 Jeep GC. It is a lot better than having it pop off on you in some godforsaken situation, and it's cheap insurance. From the frequency I could tell that it was happening in one cylinder (a few times per second at idle). When you push down on the gas pedal, that's when you hear it. This humming remains when trying to hold speed at say 40km/h, and even sometimes remains when letting off gas and truck is downshifting. i couldnt believe it. The engines run fine and no weird things in the oil. Read the Gas Stove Won't Stop Clicking discussion from the Chowhound Cookware, Stoves food community. It happens when I'm backing out of the driveway, when I'm driving around town and when I turn. 2002 283,000 miles. Proper oil used at each oil change, dealer by previous owner or by me. Whistling when letting off throttle.