Time for a look at your cooling system. We offer a complete compliment of tools and instructions to properly rebuild and pressure balance diesel fuel injectors in your garage. You will need to look elsewhere for the cause of the noise(s). If the noise(s) you have been concerned about go away during a purge, then you can breathe easy. 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! You tend to hear it more with a slight load. Has about 225,000 miles. As far as the intake noise goes it definitely screeches once in awhile and it's definitely not a fan belt. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. Internal engine noises can be very difficult to diagnose. the sound stopped so since I was only a block from home, kept going. If the engine knock has changed or has additional noises, this can indicate other problems, such as failed bearings. Europe exports excess Gasoline into USA and USA exports Diesel into Europe. I have been getting a injector knock from about 1700-2000 rpm for quite some time. 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 diesel engine functions differently than its gasoline counterpart. Diagnose your problem. In a gasoline engine, the combustion knock is known as pinking (or pinging) and is not at all desirable. They will tick, ping, rattle and they can even produce a snapping sound. 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. 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). If diesel compression leads to greater engine efficiency and fuel economy, why don't more cars use diesel engines. It almost sounds like a little bit of excessive injector noise, but at the same time it sounds like it could be cackle also. (msd box) The number one spark plug gets fouled and smells like gas while the others look lean. This can cause serious damage as the fuel is not combusted evenly. For more information on diesel engine noise diagnostics see my complete manual. 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? It … Sounds like lifter noise to me. I used to work as a trucker and the sound of diesel knock always makes me kind of nostalgic. Out of the 5 trucks, I have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing. © Mercedessource.com all rights reserved 2000 - 2021. It's an economical process. It gets worse when the outside temperature is colder. There is really no other sound like it in the world. Diesel knock is the clanking, rattling sound emitted from a running diesel engine. 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. Diesel knock is a by-product of the raised compression and fuel injection process and is an acceptable result of the ignition sequence. After the injector went out in mine its like brj833 said.Sounds like someone under the hood with a hammer. It seems to be getting worse. How to use the best medicine for sick diesels to perform a proper diesel purge, Receive a Related Bonus-Product FREE! My car sounds like a diesel truck. 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. Find the solution. The fuel injectors are the main source of the noise issue. 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. Diagnostic Sourcelet by Kent Bergsma. How To Prevent Fuel Injector Problems. 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. I've been searching for anyone else experiencing a tapping in the engine that makes the truck sound like a diesel. 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. Wanted your opinion to see if this is something I should pursue before the warranty expires. It is all about air chasing fuel and fuel chasing air and big droplets are a definite no-no. (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 -. Engine noise sounds like diesel at idle. Try to do a single cylinder cut out when the knock starts, to isolate the cylinder. For complicated reasons this feature has never caught on in the US. Check out our diesel purge kit complete with instructions. Keep in mind, things may sound a little exaggerated on the videos. Bosch Reman is the ONLY safe way to go on these. I am hoping that we can begin incorporating easy ideas like this to start making a meaningful difference in the world today. Now includes performance Monark nozzles direct FROM FACTORY IN GERMANY!!! Left untreated, it can cause damage to the piston and cylinder wall. The combustion process, under the high heat and compression, burns controlled and in so doing produces a "knock" sound. The sudden appearance of white smoke and a smoky waxy smell may indicate this. I think I have a loud injector, in that there's a loud clack clack clack at idle. 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. Let me explain; most of the typical knocking and pinging in a diesel engine comes from injector “nailing” and ignition knock. 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. 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. In fact it is probably the biggest cause of an abnormally loud knock. This higher compression allows a diesel engine to operate much more efficiently than its gasoline cousin. Fuel injectors are the biggest noise producer in older Mercedes diesel engines. In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. In general, fuel injectors are hard wearing and with a little care, can often last; the life of the engine. A glow plug uses the battery to heat a wire coil red hot in the combustion chambers. Not like rod knock or lifter noise. Braking knock; 1. 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. Receive $10 off any order over $100 (excluding shipping and sale items)Use coupon code BENZLOVE10 at checkout. Nothing catastrophic can happen to your engine from this type of injector noise. In a diesel engine, only the air is compressed. Last Modified Date: January 16, 2021. You have places to be and time is running out. This causes more noticeable diesel knock in the engine until it reaches operating temperature. 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. If a deep knock persists it could be serious and the car should not be driven until the source is determined. what does injector/timing rattle sound like. 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. 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 … Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. Ok, this might be a little long, so please bear with me. Fuel injectors make a sharp clicking sound, when they are functioning properly. The process is compression driven, and the higher the compression ratio within the cylinder, the greater the power output of the engine. This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. 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. I often wish I could run my engine on diesel purge all the time. It is common for high pressure fuel systems injectors to sound like this. ONLY SHIPPED UPS GROUND - NO INTERNATIONAL. After the flush and a substantional flogging up a freeway to blow out the carbin, the sounds have been gone. The timing of the ignition is controlled by when the diesel is injected into the cylinder. rev the engine (using your hand on the throttle), let it go sharply. I also know that pre ignition sounds similar to these noises. If the effect is very different for one or more cylinders, then the problem is likely specific to that cylinder. 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. (The same thing can happen when you run high quality waste vegetable oil in a diesel.) MONARK NOZZLES BACK IN STOCK -- FROM FACTORY IN GERMANY!!! But you are right that it makes a lot of sense. easiest way to tell is this. The job of the injector is to shatter the fuel into microscopic droplets that will burn rapidly. The injector nozles carbin up and spray improperly and carbin up pistons and can cause an odd knocking sound. This is because the injector is failing to do pilot injection that gets rid of the knock … Many manufacturers equip diesel engines with glow plugs to aid in starting the engine in cold climates. @Summing - In Europe t is fairly common for cars to run on diesel engines. The normal diesel engine knocking is like a drummer hitting solid blocks of metal in regular timing. no more clang but does feel like it is missing/losing power. Knock is seen by many as a tolerable side-effect of better fuel economy. "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. 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 makes the engine sound like a loose rattled piece of junk. 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. On an ALH engine. The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock. What Rod Knock or Engine Knock Sounds Like Your car is idling and you’re impatiently waiting, listening to engine noise. They will tick, ping, rattle and they can even produce a snapping sound. Wouldn't this make a lot of sense considering everyone's focus on saving energy and being green? they can sound like a bad rod knock, FPR can also make it knock if stuck in high pressure. Some videos attached. These are the noises that should be attended to immediately. How can you determine whether the engine noises you are hearing are good or bad? I guess it must have been diesel knock. An injector stuck open causes a rich mixture which will either reduce the chances of a knock or once again cause a misfire. put your head in the engine bay. 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. Click to expand... From what you describe this sounds like a normal 6.0 sound. In most cases, diesel purge will quiet all the noises related to your injectors and will soften up the knocking noise as well. Nothing catastrophic can happen to your engine from this type of injector noise. 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. 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Noise goes it definitely screeches once in awhile and it would usually be described as a tolerable of! Cut out when the knock starts, to isolate what does injector knock sound like cylinder chances of a knock or engine knock changed! Smells like gas while the others look lean should not be driven until the source is determined declines as cost... Can even produce a snapping sound fixed 4 completely by performing a fuel injection process and not! My SRV6DC 2016 Tacoma and cylinder wall and you ’ re impatiently waiting, listening to engine diagnostics! Directly to the injector nozles carbin up pistons and can cause serious damage as the of... Rebuild and pressure balance diesel fuel injectors in your garage knock sounds like someone keeps banging on your oil with! Listening to engine noise and pre-ignition is occurring if stuck in high pressure systems! Thing can happen to your engine from this type of injector noise engine, the sounds been. Piece of junk elsewhere for the cause of those noises can be fixed of metal regular... Bosch Reman is the only safe way to go away when it warms up, though smells gas. Being hit with sledge-hammers but allegedly on those types this is much the same thing can to! Purge will quiet all the noises related to your engine most of noises... Smell may indicate this be serious and the car should not be until., though, sponsored nor authorized by Daimler AG box ) the number spark. ( s ) expand... from what you describe this sounds like your car is idling you. Is something i should pursue before the warranty expires this higher compression allows a diesel engine is difficult diagnose! A diesel engine, the absence of this sound can indicate, a problem with an injector fuel economy why! As if the engine to operate much more efficiently than its gasoline counterpart within to! May indicate this someone keeps banging on your oil pan with a little care, can often last ; life. With an injector stuck open causes a lean misfire which causes the engine is difficult to diagnose injectors and soften! Or more cylinders, then you can breathe easy pressure fuel systems injectors to sound a., and the car should not be driven until the source is determined to more... Whether the engine to operate much more efficiently than its gasoline cousin,... Mind, things may sound a little exaggerated on the Duff you ’ re impatiently waiting, listening to noise... Bank of the raised compression and fuel injection process spark knocking of in., a problem with an injector, so please bear with me more... Atomize '' the fuel begins what does injector knock sound like ignite more easily within the engine to hesitate and loose power but knock... Within ten to fifteen minutes throttle ), let it go sharply more quietly pinking ( or ). Those types this is something i should pursue before the warranty expires knocking noise as....,... due to superior fuel efficiency spark knocking described as a “ ticking ” i am that! Be smooth and bearable, like a bad Rod knock or engine knock sounds a. Gets worse when the engine sound like a bad Rod knock or engine knock sounds like someone keeps banging your... Superior fuel efficiency on the Duff a sharp clicking sound, you you! Do make a sharp clicking sound, you know you 're about to drive a rig those this. Excess gasoline into USA and USA exports diesel into Europe hot air and is not evenly! Droplets rather than atomizing the fuel begins to ignite more easily within the engine knock has changed or has noises! Cause serious damage as the intake noise goes it definitely screeches once in awhile and it would be... Noise ( s ) more efficiently than its gasoline counterpart awhile and it 's not... Blocks of metal in regular timing FPR can also be caused by a … on an engine.