Loud Engine Noise Idle

























































I raised the car fairly high to install some carbon fiber bits and am now hearing a loud vibration sound in the cabin on idle. The noise seemed to be coming from the front top engine side. (a)  The exhaust of every internal combustion engine used on any vessel shall be effectively muffled by equipment so constructed and used as to muffle the noise of the exhaust in a reasonable manner. it sounds like a clicking noise kind of. While the engine is one of the best Ford has ever engineered, based on warranty repair numbers, it does require care and proper maintenance, like all engines. "Grinding" noise from front of engine bay during idle. Use of a block heater when the engine is idling. If you are looking for a solution, that will not only get rid of that awful lifter noise in your engine but also improve the performance of your car as well, look no further than Liquid Moly Hydraulic Lifter Additive. At first I thought it was coming from the engine, but when I lifted the bonnet I couldn't hear it. If the noise still persists, then the problem lies somewhere in the drivetrain or transmission. ) the whine/buzz is quite loud. It only happens at idle and seems to happen after engine is warm. The noise is still there. the noise is loud and obnoxious at idle when under load. When I'm idling I can hear a ticking noise coming from the engine -- and it's simply annoying. Really Loud Chattering/Knocking Noise 2009+ Lancer It sounds like its coming from the top right side of the engine. I cleaned up the camshaft, auto-decomp, oiled generously everything and assembled engine top for the last time. I had the code P0300 about two weeks ago, random engine misfire, and had it reset. Engine noise at idle noticed is the really loud whirring for ~20-30 seconds or so on a cold start, like an additional pump or fan is running or something. Noise is caused by the friction wheel of the belt tensioner. 4 I had a rattle/vibration noise coming from somewhere around the top engine/intake area and it turned out to be bad bearings in the alternator. Heya guys, Recently I've noticed a VERY LOUD humming noise from the rear of car. Almost like a rattleing noise. When I accelerate or am at speed all is well and the engine hums beautifully. 9) Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. If the noise lasts for more than a minute and completely disappears or dimishes after the engine is warm, the most likely cause is an exhaust manifold leak. I noticed it starts when the car is idling for a while. 7L I5 engine at 104k miles. You must have a legit. Its a tapping/ticking noise in rythm with revs up to about 2000rpm then the noise would disappear and reappear when its rests at idle. Take it to a different shop if the mechanic thinks that noise is normal. A quick way to check would be to remove your ancillaries belt and run the engine. To find the noise, I lifted my 825 with an auto lift, loosened the two gold bolts about 1/4", and had someone rev the engine while I pushed up on these bolts. If on the other hand, it is an older vehicle, this is the result of improper ignition timing and too low of an idle speed. Debugging the tapping required removing the head twice and going through the head with a fine tooth comb to determine the problem. What you are hearing is the injectors and is totally normal. If you have access to the lift, check the noises from below. It almost sounds like a quite loud cricket continually chirping. i am new and im sorry if i am doing this the wrong way. I had an old in-line 6 (first engine in the boat) and that had a significant gudgeon knock, and it disappeared as soon as the engine was off idle. Customers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window. The noise is usually more noticeable when the engine is warm. The alternator was still working fine, but when I took it off, the front belt pully would move up and down about 1/4 inch. This humming sound almost sounds like a motor of some sort. Squealing noise at idle. Loud Engine Noise problem of the 2016 Jeep Renegade 2 Failure Date: 07/02/2018 My 2016 Jeep Renegade fan assembly continues to lock up and make loud noises I had to get it replaced once this will be my second time replacing the fan. You can hear the sound at the very beginning, around 2:05, and then around 2:25 when I hover the gas pedal around 1100 RPMs. I would describe it as a semi-high pitched rhythmic whine coming from the engine while the car is idling in either D or R. When I push it closed the noise seems to stop so I think it may be noise and air escaping through this gap. T1N Talk General Discussions related to T1N Sprinters. I get a loud fast kind of gurgling noise from the engine at startup when the engine is completely cooled down. With the lack of information you've (haven't) provided, there is only one thing which I can think of which might be causing the noise you are describing, and that is if the main bearing in the front of the transmission is going out. I’ve seen this before on other cars…. It is loud enough to hear in the car, but especially outside. Probable Cause: The rocker shaft bridge has excessive clearance, which causes the rocker shaft to rotate and make noise. the ticking noise only does at idle once the engine is warm up and go away when you press on the gas. I am getting a knocking noise at idle cold and warm. The cause is often excessive valve clearance or a defective hydraulic valve lifter. 2007 toyota tacoma 4x4 4. The best way I could discribe is that it sounds like a diesel knock just not as bad. 7) Start engine and let it idle. This engine rattling noise happens at all speeds and gear ranges, but it quiets down slightly when transmission changes gear at the high point and the rattling begins again on the next gear onward. Prior to the Challenger I had a Charger with the 5. If you have access to the lift, check the noises from below. At first I thought it was coming from the engine, but when I lifted the bonnet I couldn't hear it. Loud Clattering Noise / Low Oil Pressure at Idle on '87 944S The oil pressure gauge was really low, 1 to 2. After about only 20 hours running time I noticed a whirring and grinding noise from the engine, but only at idle. during idle. As many of us have described, get a long metal rod or a hose and try to isolate where the noise may be coming from. I did notice the mower pulling a little harder to. I've had my transmission replaced at 6 thousand miles due to loud whine sound. Sometimes there is a loud ticking noice coming from the engine. 4 I had a rattle/vibration noise coming from somewhere around the top engine/intake area and it turned out to be bad bearings in the alternator. This is not the cause of the noise. I am just wondering if other people in here with the 5. It sounds like you have air in your power steering system. Randomly it can take about 10 seconds of cranking before it fires up. When I push it closed the noise seems to stop so I think it may be noise and air escaping through this gap. Delaying a needed car exhaust repair can make it cost more. Engine noise has increased. 0 SOHC engine commonly found in the 2000-2004 LX models, it. I just changed the oil, kept driving, put on over 130,000 miles while I owned it, junked it at 230,000 miles because of an accident. ANALYSIS This type of noise is usually caused by malfunctioning valve lifters or an exhaust manifold leak. Well I'm new to the 6. Hello all, my car's engine seems to be normal. 2 Ecotec The pressure will vary with engine temp and RPM but it should never go below 5PSI. Using a mechanic's stethoscope to locate the noise would pinpoint the source. As many of us have described, get a long metal rod or a hose and try to isolate where the noise may be coming from. It made the noise, very briefly as it started, then went away completely. As you say, the noise usually goes with a little throttle or when depressing the clutch. There is a loud whining noise coming from the engine. The noise seems to be coming from the port side of the engine towards the transom. to describe the noise it almost sounds like my car has a diesel engine, This doesn't happen all the time, and the noise is coming from the front passenger side of the vehicle, the car also has a slightly uneven idle(but not a full misfire), which I am hoping OEM spark plugs with fix. If a noise disappears at 1,000 rpm or higher, replace the water pump. I thought it may be the alternator but I changed it out yesterday and that didn't help any. The injectors are fairly loud on our engines. SYMPTOM SUMMARY The engine idles too high. I've had my transmission replaced at 6 thousand miles due to loud whine sound. I rebuilt the motor not long ago. 4 triton we recently changed the oil from valvoline max life to ams- oil after doing that my dad decided to wash the motor because it was dirty I drove it home and when I stopped at idle a loud knocking noise came and the engine started to shake. Mounts helped, the alignment procedure is very important BTW. i have a 1998 nissan 200sx se, and for a little while now ive noticed that when the car's idling the engine sounds loud the same when driving also. This noise was already there before the belts were replaced. I first noticed it when I was driving back home from work; eventually it seemed like the car lost some power and had some delay between pressing the gas pedal and actually moving. I have a 1998 BMW 528i with 180,00 miles. Took it to my shop. 0Liter type 4 engine. the ticking noise only does at idle once the engine is warm up and go away when you press on the gas. Yeah everything is updated just seems to be teething issues with the drivers. The noise is still there. Loud whining sound at idle after a fairly short run It runs great! However after the last couple of runs of only 10/15 miles I hear a high pitched whine when the engine is idling (don't think it was there before). Posted on Apr 09, 2010. The injectors are fairly loud on our engines. Prior to the Challenger I had a Charger with the 5. On your next oil changed, take your Dart over to your dealer and put it beside another one with the 2. You could not hear it except at idle or low rpms. Every morning whenever I start my engine (cold start), there this rattling noise that is very loud (sounds like a construction lorry). The Ford Explorer uses an idle speed control valve that allows air to flow thru the idle air passage inside the intake manifold. The engine sounds like it is going to come apart when started and during acceleration. Me thinks it's a 4 stroke newbie (no offense kodiakkool) hearing vavles and cams moving around inside the motor, and I'm always right :. Average failure mileage is 65,000 miles. When I remove the engine cover the tapping noise appears to be coming from the valve covers. 1999 Alhambra 1. turns off lights, dome lights, etc. The noise sounds at its worst when stood by the drivers side front wheel. As the noise continues at higher revs than idle when the oil. Now they got it in the shop but I don't know what it could possibly be. Engine noise sounds like diesel at idle. On 6/23, we were about an hour out of Albuquerque when there was suddenly a loud noise coming from the engine. It made the noise, very briefly as it started, then went away completely. The noise that I hear is quite a bit louder (audible even with the hood closed), and is a consistent single tick per engine revolution. Thanks Jason. By "noisy" I assume you are referring to the engine noise and particularly when the car is idling. If you hear a deep grinding engine noise, this may not be your engine, but your brakes. The Ford Explorer uses an idle speed control valve that allows air to flow thru the idle air passage inside the intake manifold. I'm going to also replace my wires and plugs as well but that clunky noise is getting on my last nerve. The car noise escalates from the engine and it has a very loud humming / drone / vibration noise. I have a problem with my 98 accord where my engine idle is pretty loud. Just a shaken engine which go if i push on the acceleration just a bit to up the rpm. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. About the only noises that change sound in an engine with temp. ----- Post added at 01:36 PM ----- Previous post was at 01:35 PM -----Oh, and Eddy, the sound, is that sound normal for these cars with CVT?. Replied by stiv625 on topic New engine mounts CRAZZZZZZZY vibrations at idle! I had an 02 Neon SXT with some idle and vibration issues. The newer N20 engine no longer use the vacuum actuated waste gate, they use a electronically controlled one which helps with the noise (not sure on why just is). Sounds very similar to this: 2002 Grand Marquis with random humming noise from engine compartment - YouTube. 1 The Team Producer/Designer: Henrik Forsman Lead Designer: Theodor Gerhamn Junior Designer: Andreas Rodin Lead Artist: Simon Fredell. When I start the car after letting it sit for a few minutes there is a very loud rattling noise from the engine. Fri afternoon a loud ticking/clacking noise began to take place at idle. Sounds like the timing chain if the engine is on idle there is no load on the chain, when you rev the engine it loads the tension on the chain transferring the slack in the chain away from the toothed pulleys eventually the mechanism will fail, however if you are just driving local it could last for many miles, you have to weigh up is the cost. So far I've checked the following:. The fact is there is some noise to the HV engine that some like in the Camaro and some hate in a XTS. It makes noise under the hood, but the noise you hear is usually predictable and relatively quiet. The other causes are the AC compressor clutch, idler pulley, or belt tensioner. ticking noise at idle after an engine oil change. The dealer performed an oil consumption report last may. As high-pressure exhaust escapes from a crack in the manifold or a leak in the gasket it will sound like ticking or clicking especially at idle or low engine RPMs. Sent from my Galaxy Nexus using Tapatalk. I have no loss of boost power, Cant find any pipe leaks, cars not over smoking and no knocking ticking or any cam wear noise. Everyone wants a nice sounding cam in their hot rod with a “racey” idle. I have a 2005 town and country and it was modified into a wheelchair van. 2001 FORD F150 LARIAT 4WD-5. T1N Talk General Discussions related to T1N Sprinters. The noise that I hear is quite a bit louder (audible even with the hood closed), and is a consistent single tick per engine revolution. the noise is loud and obnoxious at idle when under load. The injectors are fairly loud on our engines. My car will make a LOUD humming sound on deceleration, and at idle (only if ithe idle is higher then 800 rpm). You can hear it liek really far away and i hear other accords and they are silent as fuk. The newer N20 engine no longer use the vacuum actuated waste gate, they use a electronically controlled one which helps with the noise (not sure on why just is). The clutch being engaged or disengaged has zero effect on the noise. If your car makes noise when accelerating or turning, don't ignore it. Average failure mileage is 65,000 miles. While it was running, there was a very loud clanking noise, like something was loose. To check for this condition remove the flywheel inspection plate or cover. When the engine is warm if you go to the rear of the truck by the exaust pipe, you will hear it idle at different speeds that's the injection switching back and forth between injectors and port injection. It's pretty loud. The noise sounds like a tapping or rattling sound that begins when the engine is started and the car is not moving. the normal engine "cluk" sound but five times as loud. I have a 2011 LTZ and I have noticed that when I have the air conditioner on and I am not moving, brake applied or in park, there is an incredibly loud noise coming from the engine compartment. The noise that I hear is quite a bit louder (audible even with the hood closed), and is a consistent single tick per engine revolution. I insisted we should determine exactly what was making the noise. Neutral rollover noise will disappear when the transmission is engaged in gear. It disappears with engine revs or oil filler cap/dipstick removals at idle. I only found out that this symptom is common with the engine from this website. If the noise does continue, check with a good mechanic for correct diagnosis. I am getting a knocking noise at idle cold and warm. The engine sounds like it is going to come apart when started and during acceleration. Engine noise at idle; Results 1 to 20 of 20 Thread: Mine just be the normal clutch chatter which others have said is a bit loud on a mk7. It does not sound like bearings. I have a P250 and never noticed the fan noise until today. I've had my transmission replaced at 6 thousand miles due to loud whine sound. Persisting engine noises that are present while the engine is idle can include: Try adjusting your valves. Wiki User 06/18/2007. By Keef D, and leave the bike to idle before I set off whilst putting on helmet etc, This is REALLY loud and sounds like metal on metal. Anybody had this problem? I am scared that Jaguar will not take this problem seriously enough to fix it. 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. This condition may be caused by an internal problem with the Idle Air Control valve (IAC). The noise was not there on the IPace from my test drive. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some - 1999-2005 Pontiac Grand Am. I have an 07 A4 2. The best way I could discribe is that it sounds like a diesel knock just not as bad. If the engine has a carburetor instead of fuel injection it probably has a mechanical fuel pump mounted to the engine. It started last year - though not overly loud, the engine noise gets louder at higher RPMs - as you rev the engine at idle, you can really hear it. each camshaft chain for the 2. Prior to the Challenger I had a Charger with the 5. Is there any way to repair it? I called the dealer and they said there is a left and right timing belt cover. Maybe the noise and the power shortage are not related. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. When I remove the engine cover the tapping noise appears to be coming from the valve covers. Loud Idle, not rough loud engine 4 Answers. mercedessource Tech help - Diesel Purge can help you isolate the noise Internal engine noises can be very difficult to diagnose. So could somebody tell me what it might. Your engine is a finely tuned machine. It sounds like the engine is revving and will go about 15 seconds and then about a minute of back to normal, and then 15 seconds of the revving noise. Mark LT vehicles equipped with a 5. Indmar said that since it was such a loud clicking noise, they would replace it. When things aren't right, you know it. I am getting a knocking noise at idle cold and warm. If you have your heart set on having an outboard engine that cannot be heard at idle, do not get the E-TEC. It appears to be coming from the bellhousing or rear of engine. Squealing noise at idle. It does not do that when in idle. After about only 20 hours running time I noticed a whirring and grinding noise from the engine, but only at idle. Neutral rollover noise will disappear when the transmission is engaged in gear. It was OK but topped it up. I raised the car fairly high to install some carbon fiber bits and am now hearing a loud vibration sound in the cabin on idle. The IC will always have oil present, it comes from the crank case breather as a mist, carries through the turbo and some of it condenses in the IC. Not a Dodge shop, byt have doing business with him for years. I sprayed lube oil at the pulley and start the engine, noise is gone. 7p/l and now this noise has come back. At first I had suspected something in the valve train, but oddly enough this noise does not even sound metallic to me. I think the key is that the noise intensifies when decelerating. DIAGNOSE – ENGINE IDLES TOO HIGH. "He had delusions of adequacy. its done nearly 300,000ks. I thought my bearings/lower engine was just going to seize up on me at some point. All belts timing and serpentine) have recently been replaced. Well I'm new to the 6. Engine started to make loud ticking noise As described in the title, my 4-stroke 88cc engine starts to make a very loud ticking/ clicking noise at, say 2000+ RPM's. 0 engine noise + now won't idle and must be @ 2000rpm to keep running September 28th, 2015, 10:09 PM We owned the boat about approx 3mos (01 Stingray 190LS w/ a 3. The noise last for 2 or 3 seconds, and it only does it in the morning or after the car has been sitting a while. As the noise continues at higher revs than idle when the oil. While the engine is one of the best Ford has ever engineered, based on warranty repair numbers, it does require care and proper maintenance, like all engines. Both engines have a growl to them most due to the intake at high RPM. They are $100 each. Now, while idling/warming up the engine occasionally a tapping/rattling noise comes from the engine. The newer N20 engine no longer use the vacuum actuated waste gate, they use a electronically controlled one which helps with the noise (not sure on why just is). My PC runs fine, and it's not loud at all when I play games. I am hearing a noise on idle mainly on cold starts or when i leave the car sitting for 4 hours of more. A vacuum leak on a fuel injected engine will cause high idle. it makes noise like a ticking sound kind of loud but not that loud when I drive and when it's in idle but every time I do a oil change with oil treatment lifter noise stops after 200 miles or so it comes back or when I go 65 on the freeway I have a 2016 Dodge Charger Se and I am hearing a fluttering. The noise goes away when I accelerate and when I switch to park while engine is still running Another issue I have with my car is there's white smoke coming out while driving and it only happens occassionally at least. You can keep an eye out for any check engine lights or reduced performance but the engine noise at idle does sound fairly common for the 2. It goes away when revving. On mine, one of the torque converter bolts backed out, thus hitting the flywheel. The Symptom: Engine hesitates, and a popping sound comes from the engine. The alternator was still working fine, but when I took it off, the front belt pully would move up and down about 1/4 inch. It is not the power steering. So, to make sure we're talking about the same thing, it's a light knocking noise, not the normal injector or engine noise. All belts timing and serpentine) have recently been replaced. This issue has happened to me 5 or so times in the last month. When my DMF went from bad to worse, the entire engine would shake at idle from the DMF having become out of balance, causing some other metal parts somewhere in there to clank together as well. I sense that the engine oil has settled over a period of time not running. Lexus Rx450H Loud Buzzing Noise At Idle. However, now I do notice a seemingly loud intermittent rattling noise while the truck is at idle / possibly very low speeds. dejongmc wrote:Sometimes there is a loud ticking noice coming from the engine. Dont run the engine too long as there will be no water pump for circulation. As the noise continues at higher revs than idle when the oil. On your next oil changed, take your Dart over to your dealer and put it beside another one with the 2. Average failure mileage is 65,000 miles. This tick also isn't dangerous for your engine, but should be fixed as soon as possible to keep exhaust gases where they should be. I have a 2005 town and country and it was modified into a wheelchair van. The noise is at the idler pulley for the AC belt ( tensioner ). I pulled off the serpentine belt, and started the engine. This tick also isn’t dangerous for your engine, but should be fixed as soon as possible to keep exhaust gases where they should be. A: This is a common problem acknowledged by Honda, and the noise you hear is a faulty Variable Valve Timing actuator, which is a part inside the engine. Prior to shutting off the engine after extended idling (6 hrs) it is important to bring the engine to operating temperature (minimum of 140 degrees) to remove any carbon build up on the valves. I'm going to also replace my wires and plugs as well but that clunky noise is getting on my last nerve. The problem is; “race cars” that have those nasty sounding cams are completely different than cars that are driven on the street. Dont run the engine too long as there will be no water pump for circulation. it goes up in down with engine rpm and at about 3,000rpm it seems to go away. If your car makes noise when accelerating or turning, don't ignore it. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. If you hear knocking or ticking from either cylinder head, go to the Repair Procedure. If the light is long, the noise also goes away when the idle RPM changes (the idle RPM in my car always changes after a while if I wait at a long light; this is normal). I have a problem with my 98 accord where my engine idle is pretty loud. As soon as. Average failure mileage is 65,000 miles. after a while, the fan or something giving a fan noise starts coming up from my engine compartment, so loud until i sit inside my car with windows close can also hear the "vheeeeeeng" sound from the fan. The bike has about 28k on the clock. Its not a normal idling either. Loud Idle, not rough loud engine 4 Answers. When I looked the water pump was leaking. So I tried it again and it came on, but had a really rough idle and wanted to shut off from a lack of power or something. Why does my engine make a noise when my vehicle idles? My equinox runs great except engine makes a strage noise when the vehicle idles at stoplights and such. You could not hear it except at idle or low rpms. Everyone wants a nice sounding cam in their hot rod with a “racey” idle. 0L with 120,000 miles. when u hear from outside its like an aeroplane engine. it is not from the cold either, it was 80 degrees here yesterday and still made the noise. It does not make noise etc on low speed or idle. I pulled off the serpentine belt, and started the engine. It isn't loud enough to hear in the cab with any noise like radio, but as soon as I roll down the window, minimize any in-cab noise, or stand outside it is apparent. Ford Fusion, Ford Fusion repair, engine rattling sound, engine rattling noise, ford fusion engine problems, 2007 ford fusion, easy fix, Ford Automotive, why is my engine rattling, engine crackling. This cycle has been going on for about. It sounds like the engine is revving and will go about 15 seconds and then about a minute of back to normal, and then 15 seconds of the revving noise. Loud whining noise when idle / Increase in RPM. Note: This is a Honda C35 engine, the. I have 2014 Silverado 1500. Re: Engine noise When its on park and idle knocking its not noticeable its when Im driving and its does get louder. turns off lights, dome lights, etc. If the noise you hear is a fast tap or clatter near the top of the engine, it could be valve noise which would require you to have some - 1999-2005 Pontiac Grand Am. 4L 3V engine c. The exhaust of every internal combustion engine used on any motorboat shall be effectively muffled by equipment so constructed andused to muffle the noise of the exhaust in a reasonable manner. Re: Question about CRF450 top end noise Woody- I don't think it's the chain- he said the bike makes this sound at an idle. I don't know if we have the same noise problem but that is what I did on my CRV. 9 TDI (110 BHp) Manual I have a weird fault that is driving me mad. 4 I had a rattle/vibration noise coming from somewhere around the top engine/intake area and it turned out to be bad bearings in the alternator. I have Check Engine Light on with P0171 and P0174 and intermittent loud whistling noise at idle. Anyways, i had every noise you'll ever read about on these forums and now they're either 100% gone or very close. Grinding, ticking, clucking, you name it…it was there. When mine engages, the engine goes down to 4-500 then back to idle all within a few seconds but you can hear the whirring of the compressor. Mercruiser 3. The dealer performed an oil consumption report last may. When I push it closed the noise seems to stop so I think it may be noise and air escaping through this gap. The noise can't be heard inside the cabin and can only heard outside. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. 8 aha or atq v6 30 valve engine. Why is My Engine So Loud? If you notice your engine is suddenly louder than normal it could be caused by a number of issues, not all of them bad. When will eventually go out for about 10-15 min when they engine get a bit warm. I had the code P0300 about two weeks ago, random engine misfire, and had it reset. the truck was sitting in my driveway from the night before and when i went to start the engine, it made a loud popping noise and engine shutdown. To find the noise, I lifted my 825 with an auto lift, loosened the two gold bolts about 1/4", and had someone rev the engine while I pushed up on these bolts. Due to the frequency of the power pulses, slowing down the engine slightly more at idle by turning on the A/C and loading up the alternator with headlights and other electrical draw may increase the amount of residual rattle. Pay attention to the sound your car is making, and where it is coming from. I'm going to also replace my wires and plugs as well but that clunky noise is getting on my last nerve. The metal in the oil depending on the level and size of the metal flakes could be a alarm. The noise is at the idler pulley for the AC belt ( tensioner ). However, if there is a downside, it's the possibility of a rattle sound that may be evident at idle/low rpm. While the design is for the spark plug to ignite the fuel, compression issues cause it to burn before the plug has a chance to spark. Re: Question about CRF450 top end noise Woody- I don't think it's the chain- he said the bike makes this sound at an idle. Loud tapping noise in my new T5 !!!! I would try an engine flush and drain oil when nice and hot. I have found that if I disengage the clutch the noise goes away. 7 engine and it was the same way.









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