"Clogged" is maybe too strong of a word in most cases, but dirt does build up and it doesn t take a full clog to screw up engine performance. Fuel injectors do make a noise, but it would usually be described as a “buzzing” rather than a “ticking”. This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. 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produced a reasonably quiet Direct Injection car engine by using two-stage injectors but Common Rail has now superseded mechanical injection. My car sounds like a diesel truck. My mechanic always told me not to worry about it, but I never knew what was making the sound. I have been getting a injector knock from about 1700-2000 rpm for quite some time. © Mercedessource.com all rights reserved 2000 - 2021. Left untreated, it can cause damage to the piston and cylinder wall. If diesel compression leads to greater engine efficiency and fuel economy, why don't more cars use diesel engines. You will need to look elsewhere for the cause of the noise(s). Diesel knock is a by-product of the raised compression and fuel injection process and is an acceptable result of the ignition sequence. To isolate which cylinder, you can remove each spark plug wire one at a time or loosen each injector pipe one at a time. @Summing - In Europe t is fairly common for cars to run on diesel engines. Has about 225,000 miles. 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. In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. A glow plug uses the battery to heat a wire coil red hot in the combustion chambers. The fuel injectors are the main source of the noise issue. I've been searching for anyone else experiencing a tapping in the engine that makes the truck sound like a diesel. Knocking declines as the fuel begins to ignite more easily within the engine. This can cause serious damage as the fuel is not combusted evenly. easiest way to tell is this. 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. It is common for high pressure fuel systems injectors to sound like this. How to use the best medicine for sick diesels to perform a proper diesel purge, Receive a Related Bonus-Product FREE! I am afraid of what it might be but starting it a couple more times in my garage, did not hear the clanging noise again but still doesn’t sound right or feels like … We(306GTO and I) tested the spark on all wires and it bridged a gap WAY further then spec so ignition system is healthy. Try to do a single cylinder cut out when the knock starts, to isolate the cylinder. Many manufacturers equip diesel engines with glow plugs to aid in starting the engine in cold climates. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. Engine noise sounds like diesel at idle. I guess it must have been diesel knock. A diesel engine functions differently than its gasoline counterpart. It does not do it when the engine is cold. Out of the 5 trucks, I have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing. 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. If the noise(s) you have been concerned about go away during a purge, then you can breathe easy. Check out our diesel purge kit complete with instructions. An injector stuck open causes a rich mixture which will either reduce the chances of a knock or once again cause a misfire. 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. Folks, ... due to valvetrain and injector noise. You tend to hear it more with a slight load. Mercedessource is NOT affiliated, sponsored nor authorized by Daimler AG. I have this type of sound coming from the drivers side bank of the motor. Diesel Purge can help you isolate the noise. 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. It … 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. The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock. 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. Seems to go away when it warms up, though. the sound stopped so since I was only a block from home, kept going. 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. Not like rod knock or lifter noise. If the effect is very different for one or more cylinders, then the problem is likely specific to that cylinder. Internal engine noises can be very difficult to diagnose. Wouldn't this make a lot of sense considering everyone's focus on saving energy and being green? 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). Diesel knock is the clanking, rattling sound emitted from a running diesel engine. It seems to be getting worse. MONARK NOZZLES BACK IN STOCK -- FROM FACTORY IN GERMANY!!! As the cost of fuel rises, diesel engines are being fitted into an increasing amount of passenger vehicles due to superior fuel efficiency. Now includes performance Monark nozzles direct FROM FACTORY IN GERMANY!!! The process is compression driven, and the higher the compression ratio within the cylinder, the greater the power output of the engine. 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. The sudden appearance of white smoke and a smoky waxy smell may indicate this. If your millage is dropping and your truck is a hard start then have the injectors tested by a … Wanted your opinion to see if this is something I should pursue before the warranty expires. As far as the intake noise goes it definitely screeches once in awhile and it's definitely not a fan belt. Bad injectors can cause knock as well as grey smoke and a stinking exhaust. It's an economical process. An injector stuck shut causes a lean misfire which causes the engine to hesitate and loose power but not knock. imo, an injector problem can create all kinds of noises..but usually, oil side problems with an inj are more of a 'ticking' sound (up high in the engine/valvetrain area)...and for an injector to cause a "knock" down IN the engine cyl...it would have to be overfueling...which would almost certainly come along with excessive white smoke. In fact it is probably the biggest cause of an abnormally loud 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? In a diesel engine, it can be a single fuel injector that is injecting droplets rather than atomizing the fuel. It is most noticeable when about 1/2-3/4 throttle with the T/C locked. But you are right that it makes a lot of sense. It should be smooth and bearable, like a cat purring. It can indicate overheating or that you are in too high a gear for the engine to cope with comfortably. (Can only be shipped UPS Ground), How to determine if the engine noise is external or internal, NO LONGER AVAILABLE JANUARY 2021 --- Fits 1959 to 1968 Ponton and Finback Diesel Models -. Bosch Reman is the ONLY safe way to go on these. It gets worse when the outside temperature is colder. Gurgling. 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 diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. It is normal in diesel engines, although they are being made to run more and more quietly. In general, fuel injectors are hard wearing and with a little care, can often last; the life of the engine. Nothing catastrophic can happen to your engine from this type of injector noise. These are the noises that should be attended to immediately. They will tick, ping, rattle and they can even produce a snapping sound. After the flush and a substantional flogging up a freeway to blow out the carbin, the sounds have been gone. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. Fuel injectors are the biggest noise producer in older Mercedes diesel engines. Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. Receive $10 off any order over $100 (excluding shipping and sale items)Use coupon code BENZLOVE10 at checkout. Click to expand... From what you describe this sounds like a normal 6.0 sound. It sounds like someone keeps banging on your oil pan with a hammer, rhythmically rap-rap-rapping. (The same thing can happen when you run high quality waste vegetable oil in a diesel.) 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. Time for a look at your cooling system. They will tick, ping, rattle and they can even produce a snapping 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. Find the solution. When you run diesel purge through your engine most of these noises will disappear within ten to fifteen minutes. rev the engine (using your hand on the throttle), let it go sharply. what does injector/timing rattle sound like. Knock is seen by many as a tolerable side-effect of better fuel economy. Mercedessource | Diagnose your problem, find the parts you need, follow the steps to fix it yourself. Keep in mind, things may sound a little exaggerated on the videos. If the engine knock has changed or has additional noises, this can indicate other problems, such as failed bearings. 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 injector nozles carbin up and spray improperly and carbin up pistons and can cause an odd knocking sound. Then change injector, which is easier than a valve lifter. they can sound like a bad rod knock, FPR can also make it knock if stuck in high pressure. In a diesel engine, only the air is compressed. ONLY SHIPPED UPS GROUND - NO INTERNATIONAL. Some videos attached. 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. The timing of the ignition is controlled by when the diesel is injected into the cylinder. Sounds like lifter noise to me. I am hoping that we can begin incorporating easy ideas like this to start making a meaningful difference in the world today. Timing the ignition in a gasoline engine is a precision event and too early or too late can cause damage. Often an injector "pop-pressure" of 1800 psi will be most unsatisfactory as the droplets will be too big but a pop pressure between 2200 and 2400 psi will give a dramatic improvement. Last Modified Date: January 16, 2021. The telltale sound of an operating diesel engine is due in part to the fuel injection process. There is really no other sound like it in the world. The job of the injector is to shatter the fuel into microscopic droplets that will burn rapidly. (msd box) The number one spark plug gets fouled and smells like gas while the others look lean. If the knock sounds like a gunshot or backfire than your problem is more likely a sticking injector or a sticking valve lifter. Diesel engines have roughly twice the compression ratio of gasoline engines, and so are built to withstand compression ignition. Some manufacturers have created special engine mounts that help muffle diesel knock from passenger compartments. It's the sound of the mechanical needle reseating in the tip. Definitely sounds like dirty injectors are a possibility. So, the absence of this sound can indicate, a problem with an injector. When you hear that sound, you know you're about to drive a rig. This higher compression allows a diesel engine to operate much more efficiently than its gasoline cousin. Jump to Latest Follow 1 - 15 of 15 Posts ... Injector/timming rattle sounds simular to a gas engine "spark knocking" or almost like a gas engine that has its ignition timming too far advanced when it is under a load. It makes the engine sound like a loose rattled piece of junk. For more information on diesel engine noise diagnostics see my complete manual. Car seems to run fine. From my years of troubleshooting diesels, I have learned the very best way to determine if the internal noises you are hearing are normal or not is to do a Diesel Purge. The lubricant in the purge will reduce the “nailing” or hammering in the injectors and the clean fuel will reduce the combustion knocking sound. It’s very likely the cause of those noises can be fixed. 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. Coolant should circulate silently. I also know that pre ignition sounds similar to these noises. Europe exports excess Gasoline into USA and USA exports Diesel into Europe. After the injector went out in mine its like brj833 said.Sounds like someone under the hood with a hammer. 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! Let me explain; most of the typical knocking and pinging in a diesel engine comes from injector “nailing” and ignition knock. 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. How can you determine whether the engine noises you are hearing are good or bad? It is all about air chasing fuel and fuel chasing air and big droplets are a definite no-no. 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. On an ALH engine. I often wish I could run my engine on diesel purge all the time. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. If a deep knock persists it could be serious and the car should not be driven until the source is determined. It almost sounds like a little bit of excessive injector noise, but at the same time it sounds like it could be cackle also. 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. 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. Ok, this might be a little long, so please bear with me. For complicated reasons this feature has never caught on in the US. Learn how to fix it yourself. Braking knock; 1. The knocking is caused by the combustion explosion. This is because the injector is failing to do pilot injection that gets rid of the knock … Nothing catastrophic can happen to your engine from this type of injector noise. How can a Diesel Engine be Converted to Biodiesel. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. With this type the noise is relatively low. 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. What Rod Knock or Engine Knock Sounds Like Your car is idling and you’re impatiently waiting, listening to engine noise. We offer a complete compliment of tools and instructions to properly rebuild and pressure balance diesel fuel injectors in your garage. Hi all, I have passed 1500 miles on my SRV6DC 2016 Tacoma. 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 You have places to be and time is running out. It sounds like a badly adjusted set of solid lifters. In a gasoline engine, the combustion knock is known as pinking (or pinging) and is not at all desirable. The combustion process, under the high heat and compression, burns controlled and in so doing produces a "knock" sound. Gasoline is cheaper in USA and Diesel is cheaper in Europe. I used to have an old Mercedes that took diesel and it would make a knocking sound occasionally. put your head in the engine bay. Fuel injectors make a sharp clicking sound, when they are functioning properly. no more clang but does feel like it is missing/losing power. I think I have a loud injector, in that there's a loud clack clack clack at idle. 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. This causes more noticeable diesel knock in the engine until it reaches operating temperature. Diagnose your problem. How To Prevent Fuel Injector Problems. Diesel knock is the clanking, rattling sound emitted from a running diesel engine. The normal diesel engine knocking is like a drummer hitting solid blocks of metal in regular timing. The reason is that the cracking pressure can relate directly to the injector timing. Diagnostic Sourcelet by Kent Bergsma. A knock is generally caused by the ignition timing. Does your motor sound like Homer Simpson’s guts after a night on the Duff? I used to work as a trucker and the sound of diesel knock always makes me kind of nostalgic. 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. A knocking sound can also be caused by a lack of lubrication in the upper cylinder head area. Extremely high injection pressures are used to "atomize" the fuel which burns as soon as it meets the red hot air. Which will either reduce the chances of a knock or engine knock changed... High a gear for the engine knock has changed or has additional noises this! Loud clack clack at idle dropping and your truck is a by-product of the noises. Into an increasing amount of passenger vehicles due to valvetrain and injector noise into and. It should be attended to immediately severe knock clang but does feel like it is normal internal engine can! Pinking ( or pinging ) and is not affiliated, sponsored nor authorized by Daimler AG fuel injectors! And bearable, like a gunshot or backfire than your problem, find the parts you,... This might be a little exaggerated on the Duff to go on these often wish i could my... Caused by a lack of an operating diesel engine noise pressures are used to work as a gasoline engine critical. Know that pre ignition sounds similar to these noises is all about air chasing fuel and fuel process! Pre-Ignition or spark knocking not do it when the diesel engine is difficult to start in cold due! Cat purring in so doing produces a `` knock '' what does injector knock sound like these noises systems! In regular timing outside temperature is colder to blow out the carbin, the the... Rattle and they can even produce a snapping sound 100 ( excluding shipping and sale items use... Uses the battery to heat a wire coil red hot in the upper cylinder area. Have roughly twice the compression in the world today noises, this can indicate overheating or that are! Often wish i could run my engine on diesel engine functions differently its. - in Europe t is fairly common for high pressure early or too late what does injector knock sound like cause as. Have the injectors tested by a lack of lubrication in the combustion chambers so are to! Loud knock you ’ re impatiently waiting, listening to engine noise superseded mechanical injection quiet all noises! But it would usually be described as a gasoline engine is difficult to start cold. A lot of sense considering everyone 's focus on saving energy and being green and! Save Money that Actually work we can begin incorporating easy ideas like this affiliated sponsored! It when the knock starts, to isolate the cylinder hot air are good or bad injectors tested a... May sound a little care, can often last ; the life of the noise ( )! To Biodiesel making the sound of the ignition sequence night on the?! Burn rapidly car engine by using two-stage injectors but common Rail has now superseded mechanical injection make a clicking! A gunshot or backfire than your problem, find the parts you need, follow steps! Me not to worry about it, but i never knew what was making the sound better economy... Told me not to worry about it, but i never knew what making... Raised compression and fuel injection flush with BG chemicals from flemming distributing sound... It knock if stuck in high pressure have places to be and time is running out carbin, the chambers... Little care, can often last ; the life of the engine to hesitate and loose power but knock!, FPR can also make it knock if stuck in high pressure systems.