Harley Knocking Sound At Idle

The symptom is more pronounced when the engine is at operating temperature. Barnett Harley-Davidson - World's Most Liked Harley-Davidson Motorcycles - El Paso, Texas Motorcycle Dealership, hundreds of harleys in stock - new harleys in stock. When I have a knocking noise from the. The sound disappears with even the slightest increase in revs and takes a second or so to re-appear when returning to idle, as if the engines vibrations set off the. Got a 2018 vstrom 1000 xt. This started doing this very suddenly. I have a 2011 roadglide ultra that has had an engine knock from day one. 0 litre TD4 last year, when after a long drive (Harrrogate to Norwich and Back) I noticed a knocking noise/rattle in the engine bay. More of a tick than a knock. So, to make sure we're talking about the same thing, it's a light knocking noise, not the normal injector or engine noise. I have 2003 Harley Fat-Boy with an 88 CI balanced engine it has a slight knocking noise at low idle sounds like it coming from the lower left side of engine I had the comp nut and inside primary inspected no problem found trying to decide if I need to look into further or what it could be. When you let off the gas, it continues and maybe even gets louder. "When a motorcycle is at operating temperature and in neutral, a rattling sound may be heard on the right side coming from the area of the transmission side cover. Engine Knocking HELP!! I purchased my '05 MCS in Nov of '04 and since then it has developed an engine knocking noise over the last 3 weeks or so and it seems to be getting worse as the time goes on. Give it a little gas and sound goes away. Noisea VCT knock, the noise should disappear). If it's just at idle and decreases with engine revs, then it could be something as simple as a worn drive belt. 7L N/A, has about 80,000 miles, most of which was used for towing a boat or getting construction parts or other heavy loads. The noise also only appears when it is warmed (engine running for about 3 - 5 minutes after cold start). What causes that? How does a rebuilt axle cause a knocking sound at idle? There's a thread on it here with various hypothesis about what causes it. Sound Effects on Amazon Music. We often encounter engines that have a cold-start knock or ticking noise. I don't think it's a major engine issue because you have good oil pressure. The more i listen to it, the more it sounds like a lifter knock. Have you freed your sound today? Freesound - Sounds downloaded by foley1234. Ticking sound at Idle C-240 I would take it to the dealer and mention that I hear this sound every now and then at idle. Knock is still there. Since that time about 75 miles of local riding with no noise. I've done a little digging on the webs and my diagnosis is its Suzuki's famously bad cct that is on its way out, but i wanted to get a second opinion !. Audi A3 2005 2. Stream ad-free or purchase CD's and MP3s now on Amazon. We have measured a jittering fuel pressure in the fuel rail during that bad idle. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. but holds excellent oil pressure. Set engine speed to over 1200 RPM (if noise is Injector noise (ticking) is considered normal. Discussion. The 2002 Chevrolet Silverado has 6 problems reported for tapping noise at idle. Service, parts, cost & recommendations from YourMechanic. My 2006 vibe is a 1. The sound only occurs when the engine is idling, but it does it in all the gears, including Park. This truck is for our ranch as a store runner, I have a lot of experience with powerstrokes, duramax's and V8's but have never had a small vortec so I don't know how it should sound or feel. I bet you if you keep your hood up let it idle like that and hear the noise, then you give it some throttle with your head out the window you will hear a different noise kinda like a buzzzz but very deep and more hollow. The clacking noise you have described on start up is most likely rod knock from low oil. It rattles when the engine runs a little more on idle, and stops when it calms down. Most 2006 models have. Yesterday, while doing some "moderate" work with the tractor (primarily loader use and smoothing-out some piles of loose dirt), a bad knocking sound developed from the engine area. It sounds like a rock being knocked against a hard surface. Turn heads and command attention. Re: Knocking sound only in neutral idle V8 engines don't normally drop 200 rpm when put into gear, 50-75 rpm is more typical. I recently installed an s & s tc3 oil pump camplate and 509 chain drive cams lifters and pushrods all new bearings and followed the directions exactly bike runs great but it has a slight knock at idle when hot. Noisea VCT knock, the noise should disappear). Give it a little gas and sound goes away. The 2002 Chevrolet Silverado has 6 problems reported for tapping noise at idle. I have Focus 2017 1. This sounds more like a mechanical engine knock than a fuel/spark knock. knock and vibe goes away at higher rpm????? any other ideas before I start looking for a lower end?. I have a not too loud knocking noise coming from my Vectra C z18xe engine, the noise is only apparent during idle and does not get louder with revving. The engine was silent from a cold start and only became noisy when it was warm. This morning I went out to warm the car up and I heard it again. If I put a rag over the exhaust the sound almost goes away. I had a friend check the codes for me and it came up PO340 and PO345. It's been going on a year or so and a roof service, done both by MB and then by me, has not fixed it, nor have any of the roof rattle threads detailed on the forum. I have found knocking sound at idle if the engine has operating temperature. STI Idle, Knocking Sound I've noticed that in my '07 STi, if it's cold out, the engine sounds a little bit rough (as expected), and you can hear a "knocking" type noise from inside the car. Rev engine or while driving, no noise. On a scale of 1-10 she runs tip top at 1 and 2 as well as 5-10. by Kristian #562 (20/10/01) Please read the Disclaimer before attempting any work in this FAQ. From what I understand the knocking noise at idle that these engines make is from the piston. Edit: using good oil and 91 octane. My thoughts about engine rpm and how lugging your motor too often can eventually cause problems for your bike. 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. Zetec engine and five speed box. DIAGNOSE - ENGINE PINGS OR KNOCKS ON ACCELERATION. Check out Harley Davidson Motorcycle Start, Idle and Pull Away at Fast Speed Sound Effect by Dr. It knocks only when I ease the gas on and starts a bit after it. Sounds like you might have a loose tappet. The more i listen to it, the more it sounds like a lifter knock. Free Sound Effect Collection, Relaxing & Background Music, Loops. Harley Davidson Motorcycle Start, Idle and Pull Away at Slow Speed, a song by Sound FX on Spotify We and our partners use cookies to personalize your experience, to show you ads based on your interests, and for measurement and analytics purposes. Re: knocking sound at idle (Thorpeb2) 08-27-2009 09:47 AM #7 Worth taking rocker cover off and seeing if theres anything amiss cam chain etc, then turn engine over and see if theres anything wrong and that all tappets move up and down as they should, if all looks well, the sound will be from a rod bearing. The engine runs very smoothly and there is no check engine light or pending codes. In idle this noise was especially prevalent. Often you can quiet a small noise with dinosaur oil, but it doesn't seem like that's what is going on here. How I solved my noisey valve train on my '92 Fatboy 1340 EVO engine. If I didnt know what a rod knock sounds like I may mistake it for one but it is in the trans as I've had it on the lift and listened to it. I can only hear the knocking if I am outside of the car, if I am in the car I can't hear it at all. To verify the sound is neutral rattle, pull in the clutch lever and hold it for 10 to 15 seconds. Harley-Davidson Fuel Injection basics It is a sad day in Hogville. I can hear the noise better when you walk away from the truck just a few feet. Rod knock comes from a bad bearing in your connecting rod. Both when the engine is cold and after warm up there is a very noticeable noise coming from the crankshaft pulley head of the head. I have about 68k on it, mostly 30 mile freeway commutes. As the engine temperature increases, the engine idle should kick down automatically. Maybe because of the noise of the motor, wind, etc. It is similar to a diesel knock but higher in pitch, more metallic and 'hollow-er'. And the noise came back. With experience from previous Harleys, I didn't believe him but drove away knowing I had one year warranty on the bike. Distinguishing between the assorted rattles, squeals, knocks and ticks is somewhat of an art form. A "knocking" sound is the most typical engine noise indicating a mechanical problem that can be fixed if diagnosed correctly and early. How I solved my noisey valve train on my '92 Fatboy 1340 EVO engine. The reason for the sound has to do with the way the engine is designed. wierd knocking sound 7. It goes away above 2000 rpm. 60 miles my bike began to vibrate 5ht gear sounds like a hammer knocking on a metal frame and the power ed big time i immediatly contacted my harley. Be it upon starting the vehicle or driving it , there is a knocking sound in the engine. Owner says it burns oil and only knocks above idle. There can be three reasons for You Ac to be making the noises in the indoor unit, but the knocking is caused by * Icing of the evaporator coils. For those of you who haven't noticed or are stuck back in the 80's, a large number of the bikes coming from Milwaukee have fuel injection installed. So i got under there and bumped car over checking all bolts on fly wheel and torque converter, everything checks out. 1987 - 1996 F150 & Larger F-Series Trucks - Knocking Sound at idle? - When my truck is sitting at a light or at idle, the engine produces a knocking sound. I've noticed that it always seems to have a lifter noise from just under the tank. The main bearings can become worn from age or mileage. It is a hollow sound but sounds like metal to metal. Timing light will flash each time ignition spark occurs. It starts out slow and gets faster and faster until it stops. What is that dreadful noise? ( is it the transmission? the engine mounts? the piston grinding away at something god forbid? ) I'm familiar with the knocking caused by air being too hot and/or the fuel mixture being too lean, but to the best of my knowledge that happens under power and usually not with the engine is simply idling. same noise my clutch makes. I have a not too loud knocking noise coming from my Vectra C z18xe engine, the noise is only apparent during idle and does not get louder with revving. been riding it for 2 seasons with that rattle now. It seems that the warmer the engine is the louder the knock. It can happen cold, warm, hot. Hi guys, have anyone with similar truck experience a tic tic noise or knocking noise on cold start up of the engine, and possibly know the fix or cause of it? mechanic told me its not the engine, and might be the power steering pump, but I changed the power steering pump to a band new one and sti. Some noise can come from a worn camshaft. You may have to register before you can post: click the register link above to proceed. Have a 2005 Lasabre 3. can be heard as a light tapping noise through the wheel well and is considered normal. 2007 Harley-Davidson LHR Road King. If it were a rocker arm, it wouldnt be a knock sound, more a loud tick, and it would be all the time no matter if in gear or park, or the rpms for it would have to be a lifter for it to go away if anything other then a idle, and Im not sure or not if you have those in that motor, and again it would be a tick, not a knock for it opens the valve. Suffice it to say that enough people report this odd vibration when stopped in drive after having a parts store axle put in the front (not so much a knocking sound as a vibration though). The engine runs very smoothly and there is no check engine light or pending codes. SYMPTOM SUMMARY The engine "pings" or knocks on acceleration. The longer you go without fixing this problem, the louder those sounds are going to get. Throttle up and it goes away, also out of the water on the ears, there is no knock at idle. The more i listen to it, the more it sounds like a lifter knock. When riding the bike in warm weather and with the EITMS system enabled the bike makes a loud knocking noise when hot. It's just a annoying sound which I want to get fixed. This weekend after a short run I was at idle, in neutral and FELT and heard a loud knocking like a slamming noise. Raptor engine knocking noise at idle- Throttle body servo This is the 2nd time I have posted this issue. Harley Idle-Rev-Go free sample sounds downloads, download hip hop sound fx's, movie sound bites, film sound effects, downloadable sounds, audio clips sound effects, game show sound fx, movie sound effects, sound effects amps music, downloadable sounds effects, royalty free sound effects download, comedy wav sounds, sound effects imovie, aiff. "Looks like ya finished her off ‘fer good this time Harl’. its your bushing. 8l, auto transmission. Classic: Harley Davidson. Free Sound Effect Collection, Relaxing & Background Music, Loops. I've had this noise inspected by 4 different harley dealers with the last two telling me its normal. It seems to be the loudest when at idle and when I rev the engine it goes away briefly. That's no high pressure pump noise and it's not normal. Harley-Davidson released its new engine, the Milwaukee-Eight, and gave Baggers Magazine, an exclusive first look of its 2017 Touring family motor. Any ideas?. I have a 2005 Ford Escape 2. I’ll try my best to explain this clearly without writing a 10,000 word essay. that's what took the knock at idle noise out of my ninja 600. Funny you should bring that rattle or knocking sound up. I have a loud knocking noise coming from the engine. Harley's design engineers focused a lot of time and effort on finding the right amount of vibration in the M-E to appeal to both the hard-core, traditionalist rider and the rider who looks at the engine jumping around in the frame at idle and thinks it can't be comfortable or smooth at speed. Noise goes away if you run the engine at a higher rpm. That sound right? Mine goes away at anything above idle, like 1000-1200 rpm and it's gone. Have a 2005 Lasabre 3. the bike at idle has a very bad knocking sound and does this in first and second , but trying to get in the back yard after a test ride , 3rd didnt hook up and the knocking noise went away and the bike idles and revs out smoothly and clean , but roll back 10cm and i can hear grinding like the gear is trying to engage ,. There was no real rhythm to sound. 10 Key Differences Between Harley's Milwaukee-8 & Twin Cam. If it were a rocker arm, it wouldnt be a knock sound, more a loud tick, and it would be all the time no matter if in gear or park, or the rpms for it would have to be a lifter for it to go away if anything other then a idle, and Im not sure or not if you have those in that motor, and again it would be a tick, not a knock for it opens the valve. It's all stock. As the bearing wears out it will allow movement and that play will sound like tapping or clunking depending on how bad it is. I recently have a rattling noise coming from the top of the engine at the back towards the firewall. Contains the latest news about the band, upcoming concerts, releases and a webshop selling merchandise. This led to the oil pressure relief valve, not it :disappoin. I recently installed an s & s tc3 oil pump camplate and 509 chain drive cams lifters and pushrods all new bearings and followed the directions exactly bike runs great but it has a slight knock at idle when hot. Trust me, you will know when something doesn't sound right. A new knock sensor for each cylinder enables more-precise timing control. Harley the Cockatoo Keeps House Lively With Knocking Sounds Storyful • 31 July 2019 In this video, Harley can be seen strutting around her home and banging a cup on the wooden floors. I've checked the chain to make sure it wasn't rubbing anything, but tbh, it really sounds like it's coming from the engine block. After the car warms up, I'd expect this noise to go away, but at idle when it's warm it still makes this noise. As soon as I bump it up to just over idle, say 1000 RPMs or more, it goes away and sounds and runs smooth. E90 320i Engine Knock at Idle. 5: Detonation ("Spark Knock") Detonation, often called pinging, is nothing less than a series of small explosions that take place within an engine's combustion chambers. Have this knocking sound. The clacking noise you have described on start up is most likely rod knock from low oil. I have a weird knocking noise at idle. It is not a fastener, it is an adjustment needle, really). I would get your balance rates checked. I had a friend check the codes for me and it came up PO340 and PO345. It seems that the warmer the engine is the louder the knock. Thought I read someone had a similar problem but could not find the th tread. I have a 09, Limited, that has a distinct engine knock sound at idle. At higher rpms the. Harley Davidson Dyna Glide: Engine Noise Diagnostic Guide. 0Liter type 4 engine. The Harley V-twin engine is characteristically noisy. At idle the oil pressure is lower and if your engine is old or worn out, engine parts will bang together. only on idle. 600 RPM is the target idle speed. Unsure as to what else it could be? Thanks. Please contact us with any questions you may have. I have a honda pilot 2006 model, 100018 miles, developed a knock sounds like a light rod knock coming from the back side of the top end of the engine, was told probably the timing belt hydraulic tensioner. Your oil pressure sounds right by the gauge. This truck is for our ranch as a store runner, I have a lot of experience with powerstrokes, duramax's and V8's but have never had a small vortec so I don't know how it should sound or feel. Get Harley davidson Sounds from Soundsnap, the Leading Sound Library for Unlimited SFX Downloads. Suffice it to say that enough people report this odd vibration when stopped in drive after having a parts store axle put in the front (not so much a knocking sound as a vibration though). * * When the ice buildup on evaporator coils happens , the compressor stops. The noise is most easily heard through the forward part of the exhaust system, but can be faintly heard with the hood open from the top. This can be felt through the whole boat like something was hitting the transom. Throttle up and it goes away, also out of the water on the ears, there is no knock at idle. I've had the pistons, rings and barrels replaced due them being out of round. Main-bearing noise is caused by worn main bearings that are oversized or loose on the crankshaft, or lack oil pressure. Harley’s design engineers focused a lot of time and effort on finding the right amount of vibration in the M-E to appeal to both the hard-core, traditionalist rider and the rider who looks at the engine jumping around in the frame at idle and thinks it can’t be comfortable or smooth at speed. I thought that noise was from when the engine RPM passes through 650-700, it was making that rattling noise for a moment. I would call Honda Customer Service, tell them that the dealer is blowing you off and you want a case number assigned to resolve this problem. Noise has been occurring since timing belt replacement 1K ago. There can be three reasons for You Ac to be making the noises in the indoor unit, but the knocking is caused by * Icing of the evaporator coils. i put a stethoscope on the cam cover souds like its in thereany help would be greatbike only has 15000 on itnever made a sound before cam install. I already mentioned that the highest idle speed is very slightly advanced from correct. Why is there a knocking noise in your Harley Davidson? Unless the motor has very high mileage and has been lugged regularly (causing connecting rod bearing failure), the most common cause of. Effects of engine knocking range from inconsequential to completely destructive. I have a 09, Limited, that has a distinct engine knock sound at idle. Zetec engine and five speed box. I love my rover but HATE HATE this damn knocking noise. Clearly seems to be an oiling issue like top end is not getting lubrication,I would think if it was timing it would not come and go. its just those little o rings being worn out most likely. Sounds like you have the same feature I do, called "neutral rattle". Royalty free stock sound clip for personal, commercial, production use Motorcycle Harley Davidson Idle Loop Engine Perspective. Altho a hint to the TYPE of knocking noise will help narrow it down. The knock is only present when car is up to temperature and when it's only idle. Edit: using good oil and 91 octane. The engine runs very smoothly and there is no check engine light or pending codes. It is typically heard upon acceleration and is often the result of an irregular combustion process. It's only at an idle and seems to happen when the truck is point up hill or down hill. Rough idle and knocking noise from bottom of motor. Have a 2005 Lasabre 3. Only way I can describe it is a disengage/re-engage in gear causes a shudder or rattle and slowly rolling in reverse mine would really make the noise. But when it heats up, such as after a run for ten minutes down the highway at 55 to 65 miles per hour, then the knocking is very loud, BUT only when the engine rpm comes down to idling. the noise does not happen at idle. The noise is the oil pan resonating, but the feel of it is worse at the steering pump. I recently installed an s & s tc3 oil pump camplate and 509 chain drive cams lifters and pushrods all new bearings and followed the directions exactly bike runs great but it has a slight knock at idle when hot. The noise is more pronounced if the idle speed drops below 900rpm. Car has developed an irregular, knocking noise coming from left side of engine (timing belt area) but only occurs at warm idle. On world models, idle speed is 950-1050 RPM. Barnett Harley-Davidson - World's Most Liked Harley-Davidson Motorcycles - El Paso, Texas Motorcycle Dealership, hundreds of harleys in stock - new harleys in stock. Often you can quiet a small noise with dinosaur oil, but it doesn't seem like that's what is going on here. After research, I was convinced it was the flex plate. only on idle. usually causes heavier then normal shifting. Just trade it in for a Harley and install drag pipes. Average repair cost is $50 at 65,750 miles. There's only one carb. same noise my clutch makes. My 2006 vibe is a 1. 0 litre TD4 last year, when after a long drive (Harrrogate to Norwich and Back) I noticed a knocking noise/rattle in the engine bay. thats what i do. 30 mins drive home, did fine. If your engine ticks along with engine RPM and the ticking sounds slower, say once every engine revolution it could indicate that you’ve got rod knock. Another reason for engine knocking is an inadequate amount of lubrication in the engine, particularly around the upper cylinder head. I examined the blade clutch and noticed some rubbing between two of the parts (see photos). It's just a annoying sound which I want to get fixed. Insofar as the emissions results, if there were a problem, the check engine light should be on. It's also a tapping noise. This begins to convey the Harley mystique. About 3 blocks from the shop it all of a sudden made a loud clunk chuk noise and I lost 3456 gears. On a scale of 1-10 she runs tip top at 1 and 2 as well as 5-10. Report This by Manage My Life. Usually a sign of needing an oil change. This sound could be replicated as well while the car was parked and idling and I would rev it. Now find that I have a loud knocking noise from the rear of the engine or maybe the gearbox. I have been experiencing knocking sound from the enginebay all time i have owned my 3200. The noise is the oil pan resonating, but the feel of it is worse at the steering pump. You may have to register before you can post: click the register link above to proceed. Got a 2018 vstrom 1000 xt. After the car warms up, I'd expect this noise to go away, but at idle when it's warm it still makes this noise. I have a tap not a knock I have a tap that sounds like it is coming from the top would it be the cam or the valves it hasn't lost power or changed idle position what is the best way to find what it is. full oil temp??if its worse at idle. All Harley and metric riders are welcome. What is that dreadful noise? ( is it the transmission? the engine mounts? the piston grinding away at something god forbid? ) I'm familiar with the knocking caused by air being too hot and/or the fuel mixture being too lean, but to the best of my knowledge that happens under power and usually not with the engine is simply idling. At idle the oil pressure is lower and if your engine is old or worn out, engine parts will bang together. The noise can not be heard on the case (top or bottom). It can be extremely destructive, breaking pistons, rod bearings and anything else from the pistons down that a large hammer could damage. At higher rpms the oil pressure goes up and helps eliminate this problem. of cold stalling and rough idle sounds like. I've tried to let it idle once it's to temp in the garage and lay under it and I cant find it. If I rev the engine with the clutch in, such as taking off away from a stop, the noise is much louder and almost sounds to me like an engine that is. I just pulled the belt off it and it was still knocking so it is definietly something in the engine, its not rod knock for sure its. I have a 2011 with a 6 speed, 130K on it now and i just started noticing at times I have a light knocking sound in the trans area at idle in park. Sometimes the noise can be frighteningly loud and sound ominous--only to be engine belt noise. 0 litre TD4 last year, when after a long drive (Harrrogate to Norwich and Back) I noticed a knocking noise/rattle in the engine bay. Bike runs great. Contains the latest news about the band, upcoming concerts, releases and a webshop selling merchandise. Is your knocking occurring at idle or above? Does it knock only if the engine is hot or cold(or both)? Compare your engine noise with another F-150 or Super Duty engine with a build date of 4/18/2005 or later. Noise goes away if you run the engine at a higher rpm. When I arrived at my house with my new 06 Hayabusa I noticed at idle there was a knocking noise. Have a 2002 SL500 that has recently started to make a slight knocking sound at idle after the car has been running. Best Answer: We need more detailed info on WHERE it sounds like the knock is coming fromBUT, vaguely, from your description of being mainly at idle and insconsistent and goes away with throttle,. Bike still under warranty and dealer is suggesting carbon build up in head, wants to tear down engine. the sound appears to be louder on the bottom of the engine. i thought it was a rod, but several people have told me that a rod would continue knocking through high rpms. And the noise came back. There was no real rhythm to sound. Fired the car up and it sounds perfect at idle. The guy I bought the car from a year ago said it did that the entire time he owned it. Since i bought my GTI it's had a loud knocking noise at idle and really did sound like an old diesel van. A quick steady tap may indicate lifters or cam lobe, while a clatter may be loose/worn rocker arms. Rough idle and knocking noise from bottom of motor. But,it don't knock at idle and when I tack the RPMs up quick it doesn't knock. It could be many things that cause a tapping noise. Free Sound Effect Collection, Relaxing & Background Music, Loops. When I arrived at my house with my new 06 Hayabusa I noticed at idle there was a knocking noise. Recently adjusted valves, carbs, oil and filter change but the engine knocking continues at idle. Harley calls it a sport model, motorcycle magazines call it a sport-cruiser and I call it a big standard. What you may be suffering from is the now infamous phenomenon known as Piston Slap. Harley Davidson motorcycle - engine idling, rev, close. 07 CX7 serious knocking noise under acceleration I bought the car brand new in 2007 and since then despite regular 4000 mile oil changes with full synthetic and following the recommended service guide, it has gone through 3 turbos and a brand new factory engine, A/C compressor and transfer case. When it put the bike in gear the knocking get louder, like a car engine with bad rod bearing or main bearings. Often you can quiet a small noise with dinosaur oil, but it doesn't seem like that's what is going on here. This car is a Toyota Corolla 1500cc, multipoint injection. If you just start it and let the engine warm up you don't get the noise. I am hearing a low end deep toned knock at idle. The dealers tells me this is normal. If I didnt know what a rod knock sounds like I may mistake it for one but it is in the trans as I've had it on the lift and listened to it. And then at warm idle. turn the idle mixture screw in all the way until is seats (be gentle do not tighten the screw down. As soon as I push the gas the rattling goes away. Good luck !. LEARN MORE With a TRIO™ equipped Harley-Davidson you can go HOG wild—with better cornering performance and safety too. The main bearings can become worn from age or mileage. Harley Knocking Sound At Idle. The noise is usually more noticeable when tenperature is below 10 degrees C (50 degrees F) or if the vehicle has not been used for several days. I start car and get under there and it sounds as if its inside the torque converter. Sounds produced from the clutch, when the clutch is initially ENGAGED, are generally due to friction disc problems, such as a worn clutch disc facing, which causes a metal-to-metal grinding sound. A5s are know for an annoying, intermittent knocking noise in the cabin, near the glove box. The car also vibrates while idling. The usual cause of engine ping is over advanced. One of my motors just started making a strange rhythmic knocking sound that comes and goes. Set engine speed to over 1200 RPM (if noise is Injector noise (ticking) is considered normal. Nothing serious at all. A rod knock will only sound worse (louder) as the engine heats up. Funny you should bring that rattle or knocking sound up. VALVE TRAIN If the noise intensity is more than a lightly audible Lash adjusters can make a ticking / tapping noise knock at hot idle under 1200 RPM at engine. It's a whining noise very similar to a fule pump. How I solved my noisey valve train on my '92 Fatboy 1340 EVO engine. If it starts and idles good, but loses that good idle as it. Not comfortable with that procedure. The noise is more pronounced if the idle speed drops below 900rpm. Does anyone know if the oil pump gears can rattle and knock at low idle. This means I do not suspect a problem with a rod or rod bearing. The reason for the sound has to do with the way the engine is designed. More of a tick than a knock. What causes that? How does a rebuilt axle cause a knocking sound at idle? There's a thread on it here with various hypothesis about what causes it.