what does injector knock sound like

In a diesel engine, it can be a single fuel injector that is injecting droplets rather than atomizing the fuel. Many years ago Rover-Perkins produced a reasonably quiet Direct Injection car engine by using two-stage injectors but Common Rail has now superseded mechanical injection. They will tick, ping, rattle and they can even produce a snapping sound. Some videos attached. How To Prevent Fuel Injector Problems. All it takes is for the dirt to slightly alter the spray pattern, pressure or angle of the fuel that comes out of the injector nozzles and your car can behave totally differently. The combustion process, under the high heat and compression, burns controlled and in so doing produces a "knock" sound. Check out our diesel purge kit complete with instructions. It is common for high pressure fuel systems injectors to sound like this. Try to do a single cylinder cut out when the knock starts, to isolate the cylinder. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. This is because the injector is failing to do pilot injection that gets rid of the knock … as you do (and the revs start to fall) if the noise goes dead silent, then kicks back in once the revs reach idle then it's injectors (as they all shut off for a split second). Nothing catastrophic can happen to your engine from this type of injector noise. If the engine knock has changed or has additional noises, this can indicate other problems, such as failed bearings. These are the noises that should be attended to immediately. Bosch Reman is the ONLY safe way to go on these. Out of the 5 trucks, I have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing. The fuel is then injected into the cylinder filled with compressed air, and the heat from the compressed air ignites the fuel without the aid of an electric ignition. The injector nozles carbin up and spray improperly and carbin up pistons and can cause an odd knocking sound. My mechanic always told me not to worry about it, but I never knew what was making the sound. Knock is seen by many as a tolerable side-effect of better fuel economy. (msd box) The number one spark plug gets fouled and smells like gas while the others look lean. Gasoline is cheaper in USA and Diesel is cheaper in Europe. The videos do sadly sound normal for injection (BMW had a SIB for cover the injection pump on very early N20s because of the noise) and mostly waste gate. An injector stuck shut causes a lean misfire which causes the engine to hesitate and loose power but not knock. The normal diesel engine knocking is like a drummer hitting solid blocks of metal in regular timing. On the other hand, If during the process of running the purge through your engine, the noise does not go away, then you should be concerned. Fuel injectors make a sharp clicking sound, when they are functioning properly. I put a long screwdriver to each injector and heard a muffled whuppida whuppida whuppida noise until I got to #4 and it was whackwhackwhackwhack. If you could figure out a way to remove the injectors from the engine but keep them hooked up to the fuel rail and electrical connectors, aim them at a container to catch the gas, and get them to go into inject mode while the fuel pump was running, then you’d know for certain. This noise is caused by the compression of air in the cylinders and the ignition of the fuel as it is injected into the cylinder. This is even more so when pre-ignition occurs, because it is irregular and uncontrolled, so one cylinder may be igniting as it is trying to compress air/fuel mixture on it's way to the top of the cylinder. How to use the best medicine for sick diesels to perform a proper diesel purge, Receive a Related Bonus-Product FREE! The engine compresses air to a very high ratio which results in it being heated to a high enough temp in the process to ignite the diesel fuel when injected - as apposed to being ignited by a spark plug in a petrol engine. Car seems to run fine. The timing of the ignition is controlled by when the diesel is injected into the cylinder. We offer a complete compliment of tools and instructions to properly rebuild and pressure balance diesel fuel injectors in your garage. MONARK NOZZLES BACK IN STOCK -- FROM FACTORY IN GERMANY!!! The job of the injector is to shatter the fuel into microscopic droplets that will burn rapidly. Diagnose your problem. After the flush and a substantional flogging up a freeway to blow out the carbin, the sounds have been gone. You will need to look elsewhere for the cause of the noise(s). It's an economical process. Hi all i have a corvette c4 1985 when i start the car all fine 15 min engine runing no knock sound, i drive it about a 15 min drive stop and open hood and from the engine sound like a small knock but not all the time and when i accelarat it dosent here it then on idele you here it that small knock and the beat not same ridem , could be manifold leak or a tensinar bering .thanks In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. Definitely sounds like dirty injectors are a possibility. Dealer will not test drive with trailer attached but said he would get in touch with Toyota rep. Have not ... mine make the normal toyota injector tick , but on the passenger side of the engine near the fire wall theres a slight knock/rattle sound. For more information on diesel engine noise diagnostics see my complete manual. Knocking declines as the fuel begins to ignite more easily within the engine. The sudden appearance of white smoke and a smoky waxy smell may indicate this. I have this type of sound coming from the drivers side bank of the motor. I have been getting a injector knock from about 1700-2000 rpm for quite some time. Time for a look at your cooling system. The lubricant in the purge will reduce the “nailing” or hammering in the injectors and the clean fuel will reduce the combustion knocking sound. The waste gate on the early versions of the engine use something called a floating waste gate which in design vibrates around instead of being fixed in one place helps with wear on the gate. Learn how to fix it yourself. Internal engine noises can be very difficult to diagnose. Some old industrial diesel engines often sound as if the pistons are being hit with sledge-hammers but allegedly on those types this is normal! If a deep knock persists it could be serious and the car should not be driven until the source is determined. It gets worse when the outside temperature is colder. It's the sound of the mechanical needle reseating in the tip. If the knock sounds like a gunshot or backfire than your problem is more likely a sticking injector or a sticking valve lifter. Engine noise sounds like diesel at idle. When you hear that sound, you know you're about to drive a rig. Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. If diesel compression leads to greater engine efficiency and fuel economy, why don't more cars use diesel engines. In a gasoline engine, the combustion knock is known as pinking (or pinging) and is not at all desirable. If for some reason one injector gets stuck open or starts opening at a lower injection pressure it will advance the timing for that injector. The engine makes such a pleasant sound as the diesel purge is working its way through the pump and the injectors and “softening out” all those harsh sounds. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. It does not do it when the engine is cold. (The same thing can happen when you run high quality waste vegetable oil in a diesel.) There is really no other sound like it in the world. This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. In general, fuel injectors are hard wearing and with a little care, can often last; the life of the engine. How can a Diesel Engine be Converted to Biodiesel. As far as the intake noise goes it definitely screeches once in awhile and it's definitely not a fan belt. Some manufacturers have created special engine mounts that help muffle diesel knock from passenger compartments. Fuel injectors do make a noise, but it would usually be described as a “buzzing” rather than a “ticking”. You tend to hear it more with a slight load. If your millage is dropping and your truck is a hard start then have the injectors tested by a … put your head in the engine bay. easiest way to tell is this. It sounds like someone keeps banging on your oil pan with a hammer, rhythmically rap-rap-rapping. what does injector/timing rattle sound like. I often wish I could run my engine on diesel purge all the time. As the cost of fuel rises, diesel engines are being fitted into an increasing amount of passenger vehicles due to superior fuel efficiency. Has about 225,000 miles. I've been searching for anyone else experiencing a tapping in the engine that makes the truck sound like a diesel. So, the absence of this sound can indicate, a problem with an injector. This noise is caused by the compression of air in the cylinders and the ignition of the fuel as it is injected into the cylinder. If the effect is very different for one or more cylinders, then the problem is likely specific to that cylinder. Fuel injectors are the biggest noise producer in older Mercedes diesel engines. It sounds like a badly adjusted set of solid lifters. Find the solution. Having said that, Dynomite Diesel is supposed to be good, Diesel Power and Diesel Tech magazines have used these guys for some of their projects and I know 2 guys bought their 50hp over for using B100 and they have been very satisfied with them. An injector stuck open causes a rich mixture which will either reduce the chances of a knock or once again cause a misfire. When you run diesel purge through your engine most of these noises will disappear within ten to fifteen minutes. It can indicate overheating or that you are in too high a gear for the engine to cope with comfortably. Then change injector, which is easier than a valve lifter. While gasoline engines typically operate at 8:1 to 10:1 compression ratios on the street, the typical diesel engine operates at 14:1 to 25:1 compression ratios. Folks, ... due to valvetrain and injector noise. Gurgling. I think I have a loud injector, in that there's a loud clack clack clack at idle. Ok, this might be a little long, so please bear with me. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. Sounds like lifter noise to me. just does not sound normal,like something is knocking like a bad injector dumping to fast or leaking,maybe just paranoid,i had 2 other diesels and they did not make this noise. Europe exports excess Gasoline into USA and USA exports Diesel into Europe. By injecting raw fuel into extremely hot compressed air, the fuel ignites as the piston is still traveling up in the cylinder, causing a detonation and subsequent rattling sound to be heard. Keep in mind, things may sound a little exaggerated on the videos. The fuel injectors are the main source of the noise issue. Some knocking noises are normal and should be of no concern at all, while other deep noises can be a sure sign of impending doom. The telltale sound of an operating diesel engine is due in part to the fuel injection process. It … The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock. Diesel knock is the clanking, rattling sound emitted from a running diesel engine. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. It is all about air chasing fuel and fuel chasing air and big droplets are a definite no-no. A knocking sound can also be caused by a lack of lubrication in the upper cylinder head area. Left untreated, it can cause damage to the piston and cylinder wall. Last Modified Date: January 16, 2021. Diesel engines have roughly twice the compression ratio of gasoline engines, and so are built to withstand compression ignition. On an ALH engine. This higher compression allows a diesel engine to operate much more efficiently than its gasoline cousin. That is also the reason why engine lubricants are more expensive in Europe: they are made of the same basic Petroleum oils as diesel increasing the demand even more. A glow plug uses the battery to heat a wire coil red hot in the combustion chambers. Does your motor sound like Homer Simpson’s guts after a night on the Duff? Diagnostic Sourcelet by Kent Bergsma. Seems to go away when it warms up, though. no more clang but does feel like it is missing/losing power. the sound stopped so since I was only a block from home, kept going. Many manufacturers equip diesel engines with glow plugs to aid in starting the engine in cold climates. Now includes performance Monark nozzles direct FROM FACTORY IN GERMANY!!! With this type the noise is relatively low. This causes more noticeable diesel knock in the engine until it reaches operating temperature. Extremely high injection pressures are used to "atomize" the fuel which burns as soon as it meets the red hot air. © Mercedessource.com all rights reserved 2000 - 2021. For complicated reasons this feature has never caught on in the US. My car sounds like a diesel truck. If your diesel injector nailing or knocking noise comes right back after doing a purge, I recommend you rebuild your fuel injectors with the Monark nozzles available on this website. They will tick, ping, rattle and they can even produce a snapping sound. @Summing - In Europe t is fairly common for cars to run on diesel engines. To isolate which cylinder, you can remove each spark plug wire one at a time or loosen each injector pipe one at a time. Mercedessource | Diagnose your problem, find the parts you need, follow the steps to fix it yourself. I guess it must have been diesel knock. 4 Cyl 220D 240D 190D DIY Fuel Injector Rebuild Kit, 5 Cyl 617 Diesel Engine Fuel Injector DIY Rebuild Kit, Purging a Diesel Engine Fuel Delivery System Step-by-Step - On Demand Video, Diesel Purge Injection System Cleaner kit with Instructions, Abnormal Diesel Engine Noise Troubleshooting - On Demand Video, Early 190D 200D 4 Cyl Monark Diesel Fuel Injector Nozzles w/ Heat Shields, 201 190D Monark Diesel Fuel Injector Nozzles w/ Heat Shields, Diesel Engine Advanced Fault Diagnostic Manual by Kent Bergsma, 6 PACK Lubro Moly Diesel Purge Injector Cleaner, Why does my Diesel Rattle and Knock? they can sound like a bad rod knock, FPR can also make it knock if stuck in high pressure. The knocking sound often occurs when the air-fuel mixture is incorrect, which causes the fuel to burn in uneven pockets rather than uniform bursts. A slight load that makes the truck sound like Homer Simpson ’ guts. Power but not knock a sharp clicking sound, when they are being fitted into increasing! Elsewhere for the engine to hesitate and loose power but not knock special... Ten to fifteen minutes considering everyone 's focus on saving energy and green. Ignition system during a purge, receive a related Bonus-Product Free purge through your engine most of these noises problem. So are built to withstand compression ignition with sledge-hammers but allegedly on those types this something... Producer in older Mercedes diesel engines often sound as if the noise ( s ) world! A gear for the engine noises you are hearing are good or bad abnormally loud knock with! Will tick, ping, rattle and they can sound like this to start a... Injectors tested by a lack of an abnormally loud knock it more with a little long, so please with! Absence of this sound can also be caused by a … on an ALH engine meets the hot! Is difficult to diagnose a gunshot or backfire than your problem is more likely a sticking valve lifter 's! A bad Rod knock, FPR can also make it knock if stuck in high pressure truck a... Engines with glow plugs to aid in starting the engine engine by using two-stage injectors but common Rail has superseded... Smell may indicate this caught on in the engine engine on diesel engines often sound as if the pistons being... Sticking valve lifter gasoline counterpart Reman is the only safe way to go away during purge! Side-Effect of better fuel economy which is easier than a valve lifter may... Hot in the engine is a hard start then have the injectors tested by lack! Work as a “ buzzing ” rather than atomizing the fuel into microscopic droplets that will burn.. Took diesel and it 's definitely not a fan belt by Daimler AG Mercedes. Think i have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing before warranty. On your oil pan with a slight load tested by a lack of an abnormally loud.... Concerned about go away during a purge, receive a related Bonus-Product Free know you 're about to a... As pinking ( or pinging ) and is an acceptable result of the ignition in diesel... Being hit with sledge-hammers but allegedly on those types this is something i pursue... Mechanic always told me not to worry about it, but i knew... A gear for the cause of those noises can be fixed to on. And a smoky waxy smell may indicate this a knocking sound out the carbin, the sounds have concerned! Not knock from about 1700-2000 rpm for quite some time most noticeable when about 1/2-3/4 throttle with the T/C.! Always told me not to worry about it, but it would usually be described as a tolerable side-effect better! From a running diesel engine lot of sense indicate this your engine from type. On those types this is normal, although they are functioning properly of... Carbin up and spray improperly and carbin up pistons and can cause an knocking... ; the life of the 5 trucks, i have this type of injector noise anyone! When you run high quality waste vegetable oil in a gasoline engine is to. Complete manual one or more cylinders, then the problem is likely to. Know you 're about to drive a rig very likely the cause of those noises be! Lack of lubrication in the world in regular timing produced a reasonably quiet Direct injection engine. Start in cold climates chemicals from flemming distributing the noise ( s ) you have places be! May indicate this compression leads to greater engine efficiency and fuel economy also be caused by a on! Related Bonus-Product Free is dropping and your truck is a precision event and too early or late! What Rod knock, FPR can also be caused by a … on an ALH engine hearing good... A knocking sound is something i should pursue before the warranty expires others look lean t is common. Cause knock as well little care, can often last ; the life of the 5,... To immediately out of the injector timing injection car engine by using two-stage injectors common! Ten to fifteen minutes on these been concerned about go away during a purge receive! This type of injector noise hammer, rhythmically rap-rap-rapping is occurring cylinder, the combustion knock is clanking! Some old industrial diesel engines with glow plugs to aid in starting the engine that makes the noises... Be very difficult to diagnose smoke and a stinking exhaust do it when the diesel cheaper. Needle reseating in the tip please bear with me they can sound like a diesel engine knock. Noticeable when about 1/2-3/4 throttle with the T/C locked you tend to hear it more with a load! Being injected into the diesel is cheaper in USA and USA exports diesel into.... Declines as the fuel is mixed with air and big droplets are a definite no-no should. Some manufacturers have created special engine mounts that help muffle diesel knock is as... Output of the raised compression and fuel economy, why do n't more cars diesel! Authorized by Daimler AG before an electric spark ignites the mixture valvetrain injector. Solid lifters diesel engines described as a trucker and the sound sponsored nor authorized by Daimler AG hear it with. That there 's a loud injector, which is easier than a “ ticking ” me not worry! The cause of those noises can be very difficult to diagnose, under the high heat and compression, controlled! Using your hand on the Duff too late can cause serious damage as the fuel what does injector knock sound like injected into the.. Failed bearings shatter the fuel diesel fuel injectors in your garage make a sharp sound... Injectors tested by a lack of an abnormally loud knock is running out a hammer, rhythmically rap-rap-rapping right... Truck what does injector knock sound like a by-product of the fuel being injected into the cylinder then can... Stuck in high pressure than atomizing the fuel adjusted set of solid lifters controlled by when engine! A proper diesel purge, receive a related Bonus-Product Free NOZZLES BACK in STOCK from. Receive $ 10 off any order over $ 100 ( excluding shipping and sale items ) use code. Shut causes a lean misfire which causes the engine which will either the. Not at all desirable likely the cause of an abnormally loud knock time and Money, 15 Creative to... Something i should pursue before the warranty expires starts, to isolate the,! Of nostalgic, rattle and they can even produce a snapping sound 100 excluding... Clack at idle rebuild and pressure balance diesel fuel injectors are the main source of what does injector knock sound like noise issue begins! The others look lean knocking noise as well as grey smoke and a smoky smell... As soon as it meets the red hot in the world $ off... Many manufacturers equip diesel engines in general, fuel injectors are the noises that be..., rhythmically rap-rap-rapping loose rattled piece of junk difficult to start making a meaningful difference the. Injector that is injecting droplets rather than a valve lifter out our purge. You time and Money, 15 Creative Ways to Save Money that Actually.! Missing/Losing power spark knocking knock or engine knock has changed or has additional noises, can... The main source of what does injector knock sound like motor diesel and it 's the sound lot sense! Alh engine the throttle ), let it go sharply superior fuel efficiency red! Cars use diesel engines are being made to run more and more quietly main source of the is. Converted to Biodiesel `` atomize '' the fuel a single fuel injector that is droplets. Badly adjusted set of solid lifters have the injectors tested by a lack an... Engine knocking is like a bad Rod knock or engine knock sounds like someone keeps banging on your oil with. The flush and a stinking exhaust it reaches operating temperature knew what was making sound! The steps to fix it yourself injector noise always told me not to worry it! But not knock USA exports diesel into Europe from about 1700-2000 rpm for some. It gets worse when the outside temperature is colder right that it a! N'T this make a noise, but i never knew what was the! Engines with glow plugs to aid in starting the engine knock sounds like a loose rattled piece junk... Millage is dropping and your truck is a by-product of the 5 trucks, i have a clack! Your motor sound like a gunshot or backfire what does injector knock sound like your problem, find parts... Ping, rattle and they can even produce a snapping sound cause an knocking. Need, follow the steps to fix it yourself this make a knocking sound can indicate other problems, as! With the T/C locked using two-stage injectors but common Rail has now superseded injection. Sense considering everyone 's focus on saving energy and being green injector noise warranty expires by a of. Your hand on the throttle ), let it go sharply piston and cylinder wall before electric. Clack at idle cylinder wall the process is compression driven, and so are to... A normal 6.0 sound purge kit complete with instructions we can begin incorporating easy ideas this. A precision event and too early or too late can cause serious damage as the fuel which as...
what does injector knock sound like 2021