Knocking Noise Under Deceleration

Levels 2 and 1 prioritise braking power and are intended for use on high-grip surfaces or racetracks. I suspect that most of you talk about that sound when you say that your bike has "pinging". It spins nice, even in gear, with no clicking or. It is sounds like the motor and I can't tell which side. Toyota has announced that there will be a recall on 270,000 Lexus (and one model Toyota) worldwide — from The New York Times:. When I first start the truck, the engine starts up quiet, and smooth as it rpm's rise, then as the engine idles down, you hear the knock, pause knock, knock, knock, then the knock comes once in a while, then quietens out, as the engine temp. Loosen it with a deep socket. seems to do it when im in drive and got my foot on the brake, like if im waiting at traffic lights. It happens between 1500-1600 rpm and sounds like it is under the floor of the cab somewhere. I have a 99 RX300 with just under 90k on her. Dodge FINALLY fixes the engine noise. Back wheels were turning kicking up gravel. This noise first pops up once you get to about 25mph. Connecting rod knock noise increases in volume with engine speed and is at its loudest on deceleration. 6L 3V engine may exhibit a ticking and/or knocking noise after reaching operating temperature, or a rattle upon starting. Under hard acceleration at higher rpm use of this technique is reduced/suspended and there will be more injection noise. 3 weeks later (now) it does it much more loudly and it does it under acceleration AND deceleration. One of the most common reasons is the car is low on oil. Sound like the same problem I had: Popping Noise When Turning/Going Over Bumps To summarize - is was a passenger seat support rubbing against a metal bracket. Random — The vibration/noise comes and goes with no obvious connection to engine rpm, vehicle speed or driving conditions. Exhaust was first guess against the floor board or firewall. Enthusiasts considering a lightweight flywheel are often warned of "lightweight flywheel noise", more correctly called "gear rattle" or "gear lash noise". The noise is "deep" and strong sounding, like it's coming from a control arm bushing or strut. its not all the time only when going over uneven roads or bumps even then it doesnt do it all the time. Abnormal Tire Noise Once tires are installed on a vehicle, there is much that can go wrong, leading to excessive noise. When you hear the noise Reach up under the dash feel to the right of the steering column. Zen It happens only occasionally, specifically when I start to brake, accelerate or sometimes when I let go of the gas. The other day I returned it to the dealer for a rattling/banging noise in the primary case. Noise when. I just got done replacing the passenger side and the knock sound is still in there. You may have noticed other sellers using a similar name offering similar products. Start studying Chapter 48 Engine Mechanical Problems I. I heard it was called the Deceleration Knock that these engines are known for but just wanted more opinions. Is it a rubbery thump, a knocking over bumps or a clatter? Does it sound like it is coming from under your feet? If the dealer just replaced sway bushings for the noise, I would let them drive it with you so you can point it out to them and get their opinion on what it is. Is it possible the sound may be coming from the transmission or part of the drive-line?. The noise level of the valve mechanism cannot be properly judged where the engine is below operating temperature when the hood is raise, or when the valve rocker arm covers are removed. I have a Knocking problem in the steering, you can feel it in the pedals as well. Rod knock should be audible loaded or unloaded, less so under load if the bearing clearance isn't too out of spec and hasn't spun. Joined: Mar 27, 2009. This car is a Toyota Corolla 1500cc, multipoint injection. The unlubricated, damaged rollers then produce a grinding or squeaking sound, as they operate on the scored cap and cross surfaces. Upon initial acceleration there is a single Knock/Clunk/Thud type sound that eminates from the front of the car. Probably something loose as fuck under the hood or a bad motor mount banging around when the engine moves. Knocking/Ticking at low RPMs. It sounds like it’s in the middle of the car but it isn’t always when I’m hitting the brake. The knock was worst at about 30mph on an uneven road. Honestly I have no experience on these engines, and would have searched it up before hand. Don't hesitate to visit Firestone Complete Auto Care at the first sign of engine problems. Knocking sound occurs from the engine compartment during acceleration. If the VCT is the culprit, the noise should greatly dissipate at higher RPMs. Harley Davidson Dyna Glide: Engine Noise Diagnostic Guide. The good news it's still under the power train warranty. Worn pinion bearings can cause whirring noises at all speeds, under deceleration and/or acceleration. Toyota Tacoma Wind (Reed/Buzz) Noise From Front Doors - Cross- Wind Conditions 197533 12/2/2016 2012-2014 Toyota Tacoma Shudder on Deceleration After a Cold Soak 184497 4/10/2014 2012-2014 Toyota Tacoma MIL "ON" DTC - P015A-D A/F Sensor (1GR-FE) 186155 8/27/2014 2012-2014 Toyota Tacoma Spark Knock Noise 186992 10/14/2014. This condition is typically always diagnosed as a bad ring and Pinion gear. Sounds like that's what you have alright. I *think* it's more localized around the passenger side, but hard to tell. It will disappear as the speed of the car gets close to "matching " the engine speed. That's why rod knock is usually much louder when decelerating. very slight on starting engine then ok then when revving 12000rpm the noise occurs then as you rev higher itstops. Andre - sorry to hijack the thread, regarding the knock, i have completed the ignition map table on gear 3 till high load areas, but when i do WOT, there tends to be knocking at gear 2nd and 4th. Bearings can make that noise (loud and scratchy), and it certainly stands to reason since those vibrations you're experiencing are harsh on the pinion bearings. The knocking would be really bad under deceleration, but quiet down when I started accelerating. Setting the ignition timing while monitoring engine power output with a dynamometer is one way to correctly set the ignition timing. the one that connects transmission/engine to the frame (under the car in the rear of the motor) ive seen a lot of those especially in speed3's that ive replaced the mounts on. It's more of a click/cracking sound that a clunk. I can feel the knocking force by my left foot. I'm trying to track down a clunking or knocking noise on my 2. I found that pushing and pulling on the driver's side wiper arm caused the same noise. It sounds like a heat shield rattling making a fluttering sound but only under acceleration. 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). Average failure mileage is 50,600 miles. i have also a knocking noise on my Fiesta st 2008 and have discovered that it is the handbrake cable underneath the car between the heat shield and body of under center of where your handbrake is. The harder I brake, the louder the noise. My 05 Chevy 2500HD is making a grinding noise when decelerating, as in going down a hill. Knocking, in my world, is a hard pounding sound of two metal parts hitting each other, and it will increase or decrease with accel or decel, usually. 6L 3V engine may exhibit a ticking and/or knocking noise after reaching operating temperature, or a rattle upon starting. The noise changed. A knocking noise when braking (or during less noticeable maneuvers) can be attributed to worn front suspension parts - especially control arm bushings. Next day they were able to replicate the noise and still couldn't figure out what is wrong. WATER PUMP NOISE. Thanks for the responses, guys. We do have a lift. I am also having a similar situation. Hello everyone, I'm just looking to see if anyone knows about this engine noise that I have. The 389 in my 57 Poncho started with a knocking wristpin after a top-end race with a 55 chevy. The sound comes in both, acceleration and deceleration (actualy i think it gets worse when your doing engine braking) so i dont think its "diesel knock". MG MGB Technical Knocking Sound @ Threshold RPM BBS discussion at MG-Cars. After adjusting the throttle cable to take out some slack, I put the tank, etc. This article is based on the 1971 Buick Shop Manual, but should be similar for all Buick V-8 hydraulic lifters. Sorry rgaza84 I dint mean to hijack your thread, I was going to post about it but saw you already did. The knocking sound is only apparent under light throttle, and appears to go away with heavier acceleration, or when the throttle is completely closed. Knocking from the engine compartment. Truck runs and idles great but knocks when decelerating. Took it in and it was replaced under warranty. But if it was a cylinder wouldnt it be knocking whether or not it was in gear?. The harder I brake, the louder the noise. A damaged or worn connecting rod bearing will produce knock under all speeds. 50°C mostly heard on engine deceleration. Attachments File Description M274 LS engine noise. WRX deceleration noise update I just had a phone conversation about the WRX deceleration noise (grinding when lifting off the throttle, it has been discussed extensively on the boards) with a service advisor at my dealer. take a photo of it, i want a good laugh. Exterior Features; Bodyside/Cab Step or Running Board: Option; Bumper Step Up: Standard; Front Air Dam: Standard; Metallic Paint: Standard; Power Sliding Side Van Door: N/A; Power. This could be while turning in either direction, accelerating, or decelerating. get it high enough so both wheels off ground get someone who can watch where the driveshaft connects to the rear end diff. - Deceleration noise persists even though shifting has improved. -- That being pasted, listening to yours sounds like a knock every other rotation of the engine. Smoke under deceleration means the valve guide seals are letting some oil go past them. Connecting rod knock noise increases in volume with engine speed and is at its loudest on deceleration. The sound only occurs after driving quickly, on the highway (around 65mph) or even sometimes just normally. Return the engine speed to idle and verify if the knock returns. A knocking noise in the front wheels can be a very serious problem. its short - maybe 4 or 5 solid knocks as the car moves from a stationary position. 2013 Ford Edge About a month ago the car started making a sound from the front, similar to the sound when you drive over a concrete bridge. We don't know which sounds worse—car guys singing show tunes in the shower or a howling differential. Knocking, in my world, is a hard pounding sound of two metal parts hitting each other, and it will increase or decrease with accel or decel, usually. Whatever the setup, advance increases with engine RPM and decreases as the engine goes under a load. Back wheels were turning kicking up gravel. I just picked up a 96’ ZJ for a project. " Riding it around, it feels great, but the one thing I noticed is that it makes a very prominent, deep knocking noise during deceleration. The carrier bearing in the front differntial where wearing out. Acceleration/cruise. 50°C mostly heard on engine deceleration. If the noise is a steady metallic rap, it may indicate a rod/rod bearing. If the VCT is the culprit, the noise should greatly dissipate at higher RPMs. During the early stages of wear, connecting rod noise may be confused with piston slap or loose wrist pins. Recently, the noise is louder. I was very happy with my new car until I noticed a slight clunk/knock sound when I accelerated or took my foot of the accelerator pedal during stop and go driving. I heard it was called the Deceleration Knock that these engines are known for but just wanted more opinions. I was hoping someone could help. Always make notes if noises happen under acceleration or deceleration, and note if they happen with the clutch in or out. Quite noticeable when raising revs slowly with window down while moving, can't hear it with windows up. Has it gradually worsened? A knocking noise usually is a piston rod. 50°C mostly heard on engine deceleration. 4 enjoy, and now when I brake at slow speeds (20-30mph) there is a knocking sound. Knocking from the engine compartment. Too much crankshaft end play can do this too. Ticking/knocking noise I have an 03 Road King that I've put around 30K miles on and it has just started making a ticking/knocking sound when decelerating and rolling to a stop. MP3 noise example. A "clacking" sound disappeared, but the rattle remains. 7 Hemi has a slight vibration in either pedal (brake/gas) when accelerating and braking. A low rumble or knocking noise could be caused by a bad rod bearing on the crankshaft. The symptoms are the same, upon acceleration the noise forward hesitation is produced. It was also hard to define where the noise was coming from since it echoed through the rear subframe and made it sound like it was just coming somewhere from the back of the car. When Knock, detonation, or pre-ignition occurs, the air/fuel mixture is ignited at an improper time in the cycle. Invariably though, it pays to be in tune with noises that appear in your Land Rover, to prevent things becoming more costly in a month or so. Toyota Camry No Sound From Audio System or Trunk Lid Noise 150806 6/2/2009 2009 Toyota Camry NOISE FROM AUXILIARY PORT WITH EXTERNAL DEVICE WITH NAVIGATION SYSTEM 143340 6/4/2008 2009 Toyota Camry Power Window Master Switch may Melt 191636 10/22/2015 2009 Toyota Camry RATTLE NOISE FROM EXHAUST CENTER PIPE 145523 10/24/2008. Don't hesitate to visit Firestone Complete Auto Care at the first sign of engine problems. Jump to Latest Follow Having an issue with the 08’ si, where under load it bogs and has a knocking noise. Knocking from the engine compartment. Have a whining noise near belts was making a knocking sound before and had pulley's adjusted whining noise stops when you turn and hold steering wheel what could. It's not the typewriter tick, that's for sure. A damaged or worn connecting rod bearing will produce knock under all speeds. About 3 weeks ago my LX began to make this clicking noise inside the car that appears to be coming from either the lower dash on the driver side or the steering column. This also creates the common "pinging" noise that is often described when knock is present. MG MGB Technical Knocking Sound @ Threshold RPM BBS discussion at MG-Cars. I sat in it and gave the pedal a few revs and it seemed to be a louder and quicker. My Rogue started doing this noise approx. Loosen it with a deep socket. The base model receives a host of detail upgrades to both manual transmission and Dual Clutch Transmission (DCT) options that enhance the riding and owning experience, while the new Adventure Sports version extends the platform even further into long-range off-road territory. A quick inspection and I can’t see anything obvious. When stationary, the sound doesn't always occur, however, if I repeatedly tap the accelerator pedal, it starts to make a rattling noise. If a clanking or clicking noise is heard, particularly upon turning and accelerating, a common cause is a worn CV (Constant Velocity) joint. When the engine temp is cold, like anything under 50 or 60 degrees at a cold start, the engine sounds like crap. It's just a matter of shimming your caliper out, that’s all, and would take about 30 minutes to repair. Could an FCA cause it?. It goes with wheel speed not engine speed. Probably something loose as fuck under the hood or a bad motor mount banging around when the engine moves. He had a look under and said the drive share seemed a little rattley going to the rear, he topped up the gear pik in the transfer box and now it seems a little better, I can get to 60-£70 before it starts knocking, it actually feels like the engine is going to drop out. Random — The vibration/noise comes and goes with no obvious connection to engine rpm, vehicle speed or driving conditions. Hopefully not internal noise, IE excessive piston slap, or timing chain slap, vvt failure. The image below is from some random heavily worn lower control arm bushings. When applying pressure - GMC 2003 Sierra 2500HD question. Car is 100% stock besides the active exhaust H-pipe installed *SHOP CHECKED FOR EXHAUST LEAKS AND MALFUNCTION IN EXHAUST FLAPS - those are both cleared*. 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. If the noise intensity is more than a lightly audible knock at hot idle under 1200 RPM at engine operating temperature, replace the cam phaser. The engine still operates smoothly and as soon as I accelerate again or continue decelerating the noise stops. It was also hard to define where the noise was coming from since it echoed through the rear subframe and made it sound like it was just coming somewhere from the back of the car. Attachments File Description M274 LS engine noise. 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. Here are a few common "noises" that may come from the rear axle that need immediate attention: • A "whirring" noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. Anywhere between about 25mph and 55mph there is a noticeable knock coming from the driveshaft/rearend every time I lift off the gas. When the engine heats up and expansion occurs, this clearance is reduced enough that the ticking noise from the piston slap subsides. 0l diesel with 130k on it noticed a knocking noise when first start it then now and then during drive. Could an FCA cause it?. Hissing or sizzling under the hood. 000 miles and I have been servicing it on a regular basis, oil and filter, air cleaner. Looking at diagrams, it seems like we could repair quite a bit from underneath. Broadcast Message 7055, SSM 19707. If the VCT is the culprit, the noise should greatly dissipate at higher RPMs. The noise is a lot less when the A/C is off. Getting under the vehicle would be the only way to diagnosis the problem to determine if it is one or the other. Typically the connection road bearing noise gets louder when the engine is accelerated. Seems to only be present under throttle, during deceleration the sound disappears. "Deceleration fuel cut off" is a factory feature on many vehicles/PCMs. Howling under acceleration at various speeds, however, indicates that the gears are already worn out or are out of alignment or depth with each. Clunk from motor when going slowing down and accelerating + whining noise at 65+mph Submitted by ElectricZo on September 19, 2013 It feels like play between some gears or driveshaft. Why Would a Car Make a Ticking Noise When the Accelerator Is Pushed? There are many reasons why a car makes a ticking sound when the accelerator is pushed. The noise is only noticeable when the car is cold (not exposed to excess sun, ex. But when I start it up cold it has a knock in the engine. During the early stages of wear, connecting rod noise may be confused with piston slap or loose wrist pins. Under what conditions do you hear the noise? acceleration, idle, deceleration,????? What is a 24v aurora 5000?. Hello, recently I bought a Volvo 2008 truck with Cummins ISX 400ST engine. vehicle in the raised position with jack stands at the (3) Place transmission in neutral. ) 22 Vibration concerns (engine) Vibration from under hood or driveline (See NO. I have a 2012 and just passed 14,500 miles. One common trigger for major auto repairs is transmission problems. E46 330i rattle under acceleration. Braking knock. Strange Knocking - Fixed! Shoot me! To test what was causing it I jacked the wheel that was making the noise off the ground, gave it a tug to check for loose bearings (not loose) then turned it over and it squeaked at the point where the clip rubbed against the rubber bush. it is more severe when shifting. Recently, the night after a 350mi ride, I noticed a strange knocking sound coming out of the front end of the bike. When I first start the truck, the engine starts up quiet, and smooth as it rpm's rise, then as the engine idles down, you hear the knock, pause knock, knock, knock, then the knock comes once in a while, then quietens out, as the engine temp. All temps, oil pressure, power, smoke, etc stayed normalthe noise was the only thing new or out of the ordinary. If this happens to you, have your truck towed to the nearest qualified repair facility for repairs. 2018 Ford F-150 5. Zen It happens only occasionally, specifically when I start to brake, accelerate or sometimes when I let go of the gas. , power down when climbing hills) 13. The "ghoon ghoon ghoon" sound can be heard when you are coasting along ( the vehicle is moving without the accelerator {'race paddle'} being pressed), and the speed of the car is near or below the minimum speed for that gear (eg. Under hard acceleration at higher rpm use of this technique is reduced/suspended and there will be more injection noise. In addition, at higher road speeds (60+ mph) there is no knocking sound. Andre - sorry to hijack the thread, regarding the knock, i have completed the ignition map table on gear 3 till high load areas, but when i do WOT, there tends to be knocking at gear 2nd and 4th. When I accelerate the is no noise at all, as well on idle or PTO. Why my car makes metal knocking sound every time I accelerate the speed, and it gone when I release acceleration pedal? It happens at speed of 25 mph and up. The dealer confirmed the noise and said that it is probably the compensator nut. In this case, you should not use the car until the knocking engine noise has been fully and properly tested, diagnosed and repaired. Engine knock under heavy load and at high temperature. Please help if you can. engine symptom troubleshooting BHE010300103W01 • Confirm trouble symptom using the following diagnostic index, then go to the applicable troubleshooting chart. When I got home I let the truck idle and crawled underneath. Right after replacing the clutch and flywheel I changed the gearbox oil as preventive maintenance. Cant believe I have a problem with my Rav already. I couldn't find anything under the dash so I looked under the hood. I had the same problem with my denali. What kinds of problems would cause the car to make a noise when accelerating? There are a lot of things that can cause a noise when accelerating. When the clunk happens, it seems to be coming from either beneath the floorboard or from the rear of the car. This is usually accompanied by a loud bang and a hammering noise that beats in rhythm with the engine. I chased the same thing for a long time trying to track down the noise and it ended up being the fan support bearing. 7 knocking noise (strange) 4. When Knock, detonation, or pre-ignition occurs, the air/fuel mixture is ignited at an improper time in the cycle. 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 jacked the car back up and noticed that the axle (the right rear that was just replaced) had slipped out of its splines on the final drive side. I have just under 200 miles on my '12 Vision. Hi, I searched and didn’t find much in regard to spark knock and detonation. If you can look under your car and figure out where the fluid is coming from, it will help figure out what the problem is. I'm trying to track down a clunking or knocking noise on my 2. on and it was slow when starting and also. While test driving I did hear one knock but thought it was a pothole or something. It's a cyclic noise that is porportional to the speed of the car. 6 D engine Quashqai 2016 made a noise at low speeds on acceleration/ deceleration in 1st / 2nd gear similar the sound u get when a worn drive shaft ball joint knocks on full lock. Knocking noise while coasting/decelerating/braking on 99' Integra Like the title says, I'm hearing a knocking noise whenever my foot is not on the gas in my '99 Integra LS. TICKING AND / OR KNOCKING NOISE / STARTUPTSB 06-19-8 RATTLE FROM ENGINE—4. Mine's going in 9-3 to get looked at. Other worn vehicle parts can mimic the noise or feel of faulty transmission parts, so it becomes important how to identify noises. If this happens to you, have your truck towed to the nearest qualified repair facility for repairs. Is it a rubbery thump, a knocking over bumps or a clatter? Does it sound like it is coming from under your feet? If the dealer just replaced sway bushings for the noise, I would let them drive it with you so you can point it out to them and get their opinion on what it is. A knocking noise when braking (or during less noticeable maneuvers) can be attributed to worn front suspension parts - especially control arm bushings. Once i got them out though I could see one cup had no bearings left at all. It recently developed a loud knocking noise whenever I apply the brakes. Loud vibrating noise from under car? Clunking noise under car/loud noise when decelerating? More questions. No time to take the car in for service. Something may be loose or worn. It sometimes continues when sitting still but never really lasts long. EXCESSIVE CRANK SHAFT END PLAY. tranny grinding sound when decelerating. -- That being pasted, listening to yours sounds like a knock every other rotation of the engine. One of the most common reasons is the car is low on oil. If it is this one try switching fuel tanks and just turn the key to run but don't start the engine. Wayne Toy once had a squeak on left turns, with no squeak but a mild vibration on harder turns, which turned out to be a broken right engine mount isolator; it took him half an hour to. There are a number of reasons that a car will make extra noise, all of which are the symptom of a bigger underlying issue. (Bike sounds a little noisier at idle and riding than it did yesterday but that could just be my imagination. The pump is really loud when the pump is out of fuel and will have a muffled sound when pulling fuel. I bought my 2007 ES350 back in December, and now I started to notice rattling noises coming from both front doors when going over bumps on the road at 20-40 mph. Now it's present nearly all the time above 10 mph. Knock occurs because the pressure and temperature in the cylinder are high enough when combustion is occurring that the unburned fuel/air mixture spontaneously ignites. Clunking when braking. A clunk, whine, or howl can signal a worn-out pinion gear, bad bearings, or a. It's a cyclic noise that is porportional to the speed of the car. it has 137. SYMPTOMS OF INCORRECT IGNITION TIMING Symptoms of incorrect ignition timing are poor fuel economy, sluggish acceleration, hard starting, backfiring, or "pinging" or "spark knock". This started a couple of weeks ago and the ticking did not seam so bad it is now getting louder specially when I give it gas. Last Updated: 18 Feb 2007, by Winter #1935. PS an engine of that age should have the head gaskets redone. net if it knocks between acceleration and deceleration but not under load I would. at 6,000 km and now at 9,000km the noise is getting worst (rattle or grinding noise at slow speed or on deceleration). 22 VIBRATION CONCERN (ENGINE). put car in neutral. If it's a deeper "knocking" sound, does the sound ONLY happen at idle and deceleration (but go away under load)? Test by placing it in D and holding the brake while lightly presing the throttle (or putting it in gear and lightly applying the e-brake while accelerating). I found that pushing and pulling on the driver's side wiper arm caused the same noise. I hope you can help me, thanks. Four Common Car Noises, Their Causes, and How to Fix Them making a noise like drums in the area under the dash. I took the serp belt off and found the pulley on the Tensioner was bad, so I replaced it. When I am idling, the engine is not making a knocking sound, but rather a "chug chug chug" like a train, but it sounds distinctly different from knocking. I think it is coming from the driver's side, but it I could be wrong. I honestly started to notice it right after I had the oil changed in the front and rear gear boxes and also had two new rear tires installed. when it reachs normal temp might dissapear. The following are causes of connecting rod bearing noise:. Knocking noise while coasting/decelerating/braking on 99' Integra Like the title says, I'm hearing a knocking noise whenever my foot is not on the gas in my '99 Integra LS. Please try again later. A damaged or worn connecting rod bearing will produce knock under all speeds. I have a Knocking problem in the steering, you can feel it in the pedals as well. This feature is not available right now. my 1968 Camaro automatic with TH400 and 10 bolt rear end makes a hard knocking noise during acceleration and deceleration. It doesn't knock, but it doesn't sound very good for such a new engine. net if it knocks between acceleration and deceleration but not under load I would. In my case the knock is definatly drive shaft related as you can feel it and recreate it in the drive shaft the guibo is good it is just take up of slack in a drive train the car drives flawless no vibration no noise from the box or the from the bearings. back on and go for a quick Saturday ride. Re: Knocking-rattling under engine braking. I pulled over, and checked under the hood and everything seemed to be alright and the engine sounded fine when idling (it was dark so was not able to do. Now it's present nearly all the time above 10 mph. The Five Overlooked Car Maintenance Items How Preventative Maintenance Can Help You Avoid Catastrophic Repair Costs. It is pretty fast and makes you think the front strut might be bad. It is a knocking/ticking noise that increases as I accelerate and doesn't happen when I rev the engine in neutral. I can't tell you the exact RPMs because my truck doesn't have an RPM gauge. I insist that that sound indeed comes from the valve-train and is not caused by fuel detonation! I am sure that is the case on my bike, because I can still hear that sound under deceleration (i. I just bought a fairly used Toyota Corolla 2010 model and when I took it for a test drive, I heard noise when I accelerate which then smoothens out as I drive on till I brake again and try to accelerate, this noise seems to be coming from under the hood on the passenger side, I bought the car regardless – thinking it could be exhaust issues. Start studying Chapter 48 Engine Mechanical Problems I. The same noise, but at a lower intensity, occurs when decelerating under the same conditions. Reply either gentle or hard acceleration it often makes a rattling noise from underneath, like a tin can rattling against another. It's an equal opportunity knock!. The good news it's still under the power train warranty. It is only one knock each time. Noise when. Joined: Mar 27, 2009. Spin it by hand it makes noise and feels rough it is bad. It only goes away when the clutch is pushed in. It is possible that one of your axles broke while you were driving. It spins nice, even in gear, with no clicking or. Was ideling 10 minutes, running forward and backwars, but the noise is still there. Have a passenger ride with you to increase likeliness of determining which side the noise is emitting from. by accelerating or decelerating. I took the serp belt off and found the pulley on the Tensioner was bad, so I replaced it. EXCESSIVE CRANK SHAFT END PLAY. It does what it suggest, cuts off fuel during deceleration. In addition, at higher road speeds (60+ mph) there is no knocking sound. Again, they call it a tapping not knocking noise. Related Articles. I think there was one person that reported a tapping/knocking soundturns out it was a midget under the dash with a hammerlol I don't recall anyone posting about such a sound happening on deceleration. Changed that out and a LOT of what I thought was injector noise disappeared. ‘Rod knocking’ sounds could mean that one part deep inside the engine has worn out. It dose not happen every time we accelerate, maybe 3 or 4 during the week and the noise is short lived. I know about that. The drivers side was smoother and the shuttering much less pronounced. Now the motor is solid going up or down in rpm. This sounds exactly like main bearing noise to me, a loud knocking under acceleration, but quiet when the engine is not under load. Using a feeler gauge to check for the proper clearance can tell you right away if that's the cause of the knocking and the black smoke. If I coast the noise again is not there till gas is applied. The carrier bearing in the front differntial where wearing out. Water hammer was exploited before there was even a word for it; in 1772, Englishman John Whitehurst built a hydraulic ram for a home in Cheshire, England. Ideas?!?! Need some help. A friend of mine had a bad motor mount that only made noise under acceleration.

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