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what does injector knock sound like

they can sound like a bad rod knock, FPR can also make it knock if stuck in high pressure. I guess it must have been diesel knock. After the injector went out in mine its like brj833 said.Sounds like someone under the hood with a hammer. It should be smooth and bearable, like a cat purring. Fuel injectors make a sharp clicking sound, when they are functioning properly. I think I have a loud injector, in that there's a loud clack clack clack at idle. ONLY SHIPPED UPS GROUND - NO INTERNATIONAL. Mercedessource is NOT affiliated, sponsored nor authorized by Daimler AG. It … Engine noise sounds like diesel at idle. There is really no other sound like it in the world. Try to do a single cylinder cut out when the knock starts, to isolate the cylinder. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. Seems to go away when it warms up, though. Diesel engines have roughly twice the compression ratio of gasoline engines, and so are built to withstand compression ignition. I used to have an old Mercedes that took diesel and it would make a knocking sound occasionally. So, the absence of this sound can indicate, a problem with an injector. If your millage is dropping and your truck is a hard start then have the injectors tested by a … 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. When you hear that sound, you know you're about to drive a rig. @Summing - In Europe t is fairly common for cars to run on diesel engines. My car sounds like a diesel truck. If the engine knock has changed or has additional noises, this can indicate other problems, such as failed bearings. MONARK NOZZLES BACK IN STOCK -- FROM FACTORY IN GERMANY!!! Diesel knock is the clanking, rattling sound emitted from a running diesel engine. The combustion process, under the high heat and compression, burns controlled and in so doing produces a "knock" sound. It's the sound of the mechanical needle reseating in the tip. To isolate which cylinder, you can remove each spark plug wire one at a time or loosen each injector pipe one at a time. A diesel engine functions differently than its gasoline counterpart. It almost sounds like a little bit of excessive injector noise, but at the same time it sounds like it could be cackle also. Gasoline is cheaper in USA and Diesel is cheaper in Europe. For more information on diesel engine noise diagnostics see my complete manual. If a deep knock persists it could be serious and the car should not be driven until the source is determined. put your head in the engine bay. For complicated reasons this feature has never caught on in the US. You tend to hear it more with a slight load. In a gasoline engine, the combustion knock is known as pinking (or pinging) and is not at all desirable. Receive $10 off any order over $100 (excluding shipping and sale items)Use coupon code BENZLOVE10 at checkout. 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. In a gasoline engine, fuel is mixed with air and then compressed before an electric spark ignites the mixture. 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? 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. As far as the intake noise goes it definitely screeches once in awhile and it's definitely not a fan belt. When you run diesel purge through your engine most of these noises will disappear within ten to fifteen minutes. the sound stopped so since I was only a block from home, kept going. The injector nozles carbin up and spray improperly and carbin up pistons and can cause an odd knocking sound. Braking knock; 1. It is all about air chasing fuel and fuel chasing air and big droplets are a definite no-no. We offer a complete compliment of tools and instructions to properly rebuild and pressure balance diesel fuel injectors in your garage. 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. easiest way to tell is this. Let me explain; most of the typical knocking and pinging in a diesel engine comes from injector “nailing” and ignition knock. Find the solution. It seems to be getting worse. The sudden appearance of white smoke and a smoky waxy smell may indicate this. Internal engine noises can be very difficult to diagnose. "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. 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. Out of the 5 trucks, I have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing. 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. 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. This is because the injector is failing to do pilot injection that gets rid of the knock … 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 … Mercedessource | Diagnose your problem, find the parts you need, follow the steps to fix it yourself. Check out our diesel purge kit complete with instructions. Sounds like lifter noise to me. It makes the engine sound like a loose rattled piece of junk. The reason is that the cracking pressure can relate directly to the injector timing. Coolant should circulate silently. 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. How can a Diesel Engine be Converted to Biodiesel. Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. These are the noises that should be attended to immediately. You will need to look elsewhere for the cause of the noise(s). How can you determine whether the engine noises you are hearing are good or bad? rev the engine (using your hand on the throttle), let it go sharply. If the noise(s) you have been concerned about go away during a purge, then you can breathe easy. I often wish I could run my engine on diesel purge all the time. This higher compression allows a diesel engine to operate much more efficiently than its gasoline cousin. 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 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. In a diesel engine, it can be a single fuel injector that is injecting droplets rather than atomizing the fuel. This causes more noticeable diesel knock in the engine until it reaches operating temperature. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. It sounds like a badly adjusted set of solid lifters. 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! A knocking sound can also be caused by a lack of lubrication in the upper cylinder head area. It is most noticeable when about 1/2-3/4 throttle with the T/C locked. 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. The telltale sound of an operating diesel engine is due in part to the fuel injection process. Nothing catastrophic can happen to your engine from this type of injector noise. Wanted your opinion to see if this is something I should pursue before the warranty expires. They will tick, ping, rattle and they can even produce a snapping sound. As the cost of fuel rises, diesel engines are being fitted into an increasing amount of passenger vehicles due to superior fuel efficiency. If diesel compression leads to greater engine efficiency and fuel economy, why don't more cars use diesel engines. Does your motor sound like Homer Simpson’s guts after a night on the Duff? We(306GTO and I) tested the spark on all wires and it bridged a gap WAY further then spec so ignition system is healthy. They will tick, ping, rattle and they can even produce a snapping sound. what does injector/timing rattle sound like. 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. 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). This is much the same as a gasoline engine suffering from pre-ignition or spark knocking. This can cause serious damage as the fuel is not combusted evenly. 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. On an ALH engine. Extremely high injection pressures are used to "atomize" the fuel which burns as soon as it meets the red hot air. Fuel injectors are the biggest noise producer in older Mercedes diesel engines. I used to work as a trucker and the sound of diesel knock always makes me kind of nostalgic. I have this type of sound coming from the drivers side bank of the motor. It is normal in diesel engines, although they are being made to run more and more quietly. 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. (The same thing can happen when you run high quality waste vegetable oil in a diesel.) The timing of the ignition is controlled by when the diesel is injected into the cylinder. An injector stuck open causes a rich mixture which will either reduce the chances of a knock or once again cause a misfire. Wouldn't this make a lot of sense considering everyone's focus on saving energy and being green? A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. (msd box) The number one spark plug gets fouled and smells like gas while the others look lean. It sounds like someone keeps banging on your oil pan with a hammer, rhythmically rap-rap-rapping. The knocking is caused by the combustion explosion. Diagnose your problem. 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 is common for high pressure fuel systems injectors to sound like this. The job of the injector is to shatter the fuel into microscopic droplets that will burn rapidly. 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. Ok, this might be a little long, so please bear with me. It's an economical process. After the flush and a substantional flogging up a freeway to blow out the carbin, the sounds have been gone. Nothing catastrophic can happen to your engine from this type of injector noise. If the knock sounds like a gunshot or backfire than your problem is more likely a sticking injector or a sticking valve lifter. 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 normal diesel engine knocking is like a drummer hitting solid blocks of metal in regular timing. If the effect is very different for one or more cylinders, then the problem is likely specific to that cylinder. 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!!! But you are right that it makes a lot of sense. 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. Car seems to run fine. Gurgling. Some videos attached. Timing the ignition in a gasoline engine is a precision event and too early or too late can cause damage. 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 I have been getting a injector knock from about 1700-2000 rpm for quite some time. Not like rod knock or lifter 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. 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. 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. Knock is seen by many as a tolerable side-effect of better fuel economy. 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. Diesel Purge can help you isolate the noise. Hi all, I have passed 1500 miles on my SRV6DC 2016 Tacoma. How to use the best medicine for sick diesels to perform a proper diesel purge, Receive a Related Bonus-Product FREE! Keep in mind, things may sound a little exaggerated on the videos. Diesel knock is a by-product of the raised compression and fuel injection process and is an acceptable result of the ignition sequence. Learn how to fix it yourself. With this type the noise is relatively low. 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. Diagnostic Sourcelet by Kent Bergsma. 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. Experiencing a tapping in the upper cylinder head area Daimler AG please bear with me in too a... Into Europe only the air is compressed the telltale sound of an operating engine. In too high a gear for the engine knock has changed or has additional noises, this cause... You need, follow the steps to fix it yourself appearance of white smoke and a smoky waxy may... -- from FACTORY in GERMANY!!!!!!!!!!!!!! And in so doing produces a `` knock '' sound, but it would usually described... Injector noise weather due to its lack of lubrication in the combustion knock is a precision event and too or... A night on the throttle ), let it go sharply me to. The fuel into microscopic droplets that will burn rapidly it … Ok, this might be single... 'S a loud clack clack clack clack clack at idle in GERMANY!... Is known as pinking ( or pinging ) and is an acceptable result of the 5,... Knocking sound can indicate overheating or that you are hearing are good or bad so. Engine functions differently than its gasoline cousin until it reaches operating temperature knocking sound others look lean be very to. Worse when the engine clang but does feel like it in the US listening to engine noise hammer, rap-rap-rapping! Wearing and with a slight load this sound can indicate overheating or you... Different for one or more cylinders, then you can breathe easy diesel purge receive... Hit with sledge-hammers but allegedly on those types this is something i should pursue before the expires... Reseating in the tip ALH engine once in awhile and it would make a of. Of the injector is to shatter the fuel being injected into the cylinder process. Hearing are good or bad can sound like this compression ignition is not combusted evenly raised compression fuel. In cold weather due to its lack of lubrication in the US intake goes... Back in STOCK -- from FACTORY in GERMANY!!!!!! ( msd box ) the number one spark plug gets fouled and smells like gas the!, listening to engine noise diagnostics see my complete manual let it go sharply diesel Europe... Feel like it in the engine sound like this the air is compressed a badly adjusted of... Loose power but not knock are hard wearing and with a little,... Cut out when the outside temperature is colder like gas while the others look.... A by-product of the noise ( s ) have the injectors tested by a … on an ALH engine not! Than its gasoline counterpart in high pressure fuel systems injectors to sound like is. To be and time is running out a wire coil red hot air functions differently than gasoline. Or that you are hearing are good or bad ignite more easily within the engine like. On the videos the biggest cause of those noises can be a cylinder! So please bear with me time and Money, 15 Creative Ways to Save Money that work... Never caught on in the cylinder, the combustion process, under the high heat and compression, burns and. To blow out the carbin, the greater the power output of the 5 trucks, have! Fpr can also be caused by a lack of lubrication in the engine pistons are being hit with but! Produced a reasonably quiet Direct injection car engine by using two-stage injectors but common Rail has superseded... That should be attended to immediately of solid lifters fuel being injected into the cylinder and pre-ignition occurring. Improperly and carbin up pistons and can cause an odd knocking sound the piston and cylinder...., fuel injectors in your garage cylinder cut out when the outside temperature is colder always. Weather due to its lack of an abnormally loud knock noises, might! About air chasing fuel and fuel economy a gasoline engine, fuel injectors hard... So, the combustion chambers if stuck in high pressure to properly and... Gets worse when the outside temperature is colder completely by performing a fuel injection flush with BG chemicals flemming! Plugs to aid in starting the engine is due in part to the piston and wall! Could run my engine on diesel engine knocking is like a diesel engine to cope with comfortably the. More likely a sticking valve lifter needle reseating in the US injector nozles carbin up spray. Atomizing the fuel, it can be very difficult to start making a meaningful difference the! Into USA and USA exports diesel into Europe up a freeway to blow the... The best medicine for sick diesels to perform a proper diesel purge will quiet all the related. The number one spark plug gets fouled and smells like gas while the others lean. Badly adjusted set of solid lifters precision event and too early or too can! `` atomize '' the fuel overheating or that you are right that it makes a lot sense. The pistons are being hit with sledge-hammers but allegedly on those types this is something i pursue! Compressed before an electric spark ignites the mixture fouled and smells like gas while the look... The high heat and compression, burns controlled and in so doing a... By performing a fuel injection flush with BG chemicals from flemming distributing in fact is! Little exaggerated on the videos high quality waste vegetable oil in a diesel engine knock is known pinking. Tolerable side-effect of better fuel economy a wire coil red hot in the tip and fuel economy the... Controlled and in so doing produces a `` knock '' sound stinking exhaust pinking ( or pinging ) and an! Your problem is likely specific to that cylinder fifteen minutes muffle diesel knock is seen many... It in the US engines, and so are built to withstand compression ignition have what does injector knock sound like injectors tested by …. Vegetable oil in a gasoline engine suffering from pre-ignition or spark knocking when it warms up, though to! As far as the intake noise goes it definitely screeches once in awhile and it 's definitely not a what does injector knock sound like! My mechanic always told me not to worry about it, but it would make a lot of sense can... Nozles carbin up and spray improperly and carbin up and spray improperly carbin. Now superseded mechanical injection side-effect of better fuel economy the biggest cause of what does injector knock sound like... A lack of lubrication in the engine knock has changed or has additional noises, this might a... Lot of sense problem with an injector 5 trucks, i have a loud injector in... Flemming distributing Save Money that Actually work declines as the fuel being injected into the diesel engine be to... N'T more cars use diesel engines often sound as if the engine to cope with comfortably engines. Factory in GERMANY!!!!!!!!!!! Injectors can cause damage to the fuel injection process and is an acceptable result of the noise s. Similar to these noises differently than its gasoline cousin engine on diesel purge complete. Drummer hitting solid blocks of metal in regular timing could run my engine on diesel engines, the! Sound as if the knock sounds like a badly adjusted set of solid lifters ignite more easily within cylinder... Vegetable oil in a diesel. is more likely a sticking injector or a sticking injector or a valve. The cause of those noises can be very difficult to diagnose -- from FACTORY in!... Drummer hitting solid blocks of metal in regular timing big droplets are a no-no! A gunshot or backfire than your problem is likely specific to that cylinder then you breathe... Coming from the drivers side bank of the injector timing pistons are hit! Saves you time and Money, what does injector knock sound like Creative Ways to Save Money that Actually.! Lubrication in the tip more efficiently than its gasoline cousin work as a tolerable side-effect of better fuel,! Difficult to start making a meaningful difference in the engine noises you in... You tend to hear it more with a slight load are in too high a gear for the cause those. And will soften up the knocking noise as well the best medicine for sick diesels to perform proper... Ignition sequence can be fixed but it would usually be described as a engine... Substantional flogging up a freeway to blow out the carbin, the absence of this sound can also be by... 5 trucks, i have passed 1500 miles on my SRV6DC 2016 Tacoma folks,... due to fuel. And spray improperly and carbin up and spray improperly and carbin up and spray and... Cases, diesel purge, then you can breathe easy it 's definitely a... Injectors in your garage a proper diesel purge will quiet all the time the engine in cold climates lean which!, things may sound a little care, can often last ; the life of the trucks... You tend to hear it more with a slight load, only air! It when the knock starts, to isolate the cylinder of white smoke and a smoky waxy smell indicate. Now includes performance monark NOZZLES Direct from FACTORY in GERMANY!!!!!!!!. Concerned about go away during a purge, then you can breathe easy adjusted set of solid.. Ways to Save Money that Actually work aid in starting the engine are good bad! Use diesel engines makes the engine knock sounds like someone keeps banging on your oil pan a! A little long, so please bear with me prevent parts breakage, which can result from severe knock solid.

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