What Rod Knock or Engine Knock Sounds Like Your car is idling and you’re impatiently waiting, listening to engine noise. An injector stuck open causes a rich mixture which will either reduce the chances of a knock or once again cause a misfire. 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. How can you determine whether the engine noises you are hearing are good or bad? It is normal in diesel engines, although they are being made to run more and more quietly. Coolant should circulate silently. Internal engine noises can be very difficult to diagnose. (The same thing can happen when you run high quality waste vegetable oil in a diesel.) My mechanic always told me not to worry about it, but I never knew what was making the sound. Folks, ... due to valvetrain and injector noise. Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. 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. Gurgling. The injector nozles carbin up and spray improperly and carbin up pistons and can cause an odd knocking sound. Ok, this might be a little long, so please bear with me. I guess it must have been diesel knock. Knocking declines as the fuel begins to ignite more easily within the engine. To isolate which cylinder, you can remove each spark plug wire one at a time or loosen each injector pipe one at a time. If a deep knock persists it could be serious and the car should not be driven until the source is determined. 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. It should be smooth and bearable, like a cat purring. It’s very likely the cause of those noises can be fixed. A glow plug uses the battery to heat a wire coil red hot in the combustion chambers. put your head in the engine bay. Not like rod knock or lifter noise. This causes more noticeable diesel knock in the engine until it reaches operating temperature. If the effect is very different for one or more cylinders, then the problem is likely specific to that cylinder. 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 … 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. Left untreated, it can cause damage to the piston and cylinder wall. It can indicate overheating or that you are in too high a gear for the engine to cope with comfortably. 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 far as the intake noise goes it definitely screeches once in awhile and it's definitely not a fan belt. Then change injector, which is easier than a valve lifter. Seems to go away when it warms up, though. There is really no other sound like it in the world. I have this type of sound coming from the drivers side bank of the motor. This is because the injector is failing to do pilot injection that gets rid of the knock … It's an economical process. In a gasoline engine, the combustion knock is known as pinking (or pinging) and is not at all desirable. The lubricant in the purge will reduce the “nailing” or hammering in the injectors and the clean fuel will reduce the combustion knocking sound. Some videos attached. A diesel engine is difficult to start in cold weather due to its lack of an electronic ignition system. Check out our diesel purge kit complete with instructions. Time for a look at your cooling system. Does your motor sound like Homer Simpson’s guts after a night on the Duff? Diagnostic Sourcelet by Kent Bergsma. 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 used to have an old Mercedes that took diesel and it would make a knocking sound occasionally. 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. 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. We offer a complete compliment of tools and instructions to properly rebuild and pressure balance diesel fuel injectors in your garage. We(306GTO and I) tested the spark on all wires and it bridged a gap WAY further then spec so ignition system is healthy. If your millage is dropping and your truck is a hard start then have the injectors tested by a … A knock is generally caused by the ignition timing. This higher compression allows a diesel engine to operate much more efficiently than its gasoline cousin. You have places to be and time is running out. 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. 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. If diesel compression leads to greater engine efficiency and fuel economy, why don't more cars use diesel engines. 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. It's the sound of the mechanical needle reseating in the tip. The process is compression driven, and the higher the compression ratio within the cylinder, the greater the power output of the engine. Let me explain; most of the typical knocking and pinging in a diesel engine comes from injector “nailing” and ignition knock. Fuel injectors are the biggest noise producer in older Mercedes diesel engines. I am hoping that we can begin incorporating easy ideas like this to start making a meaningful difference in the world today. It is all about air chasing fuel and fuel chasing air and big droplets are a definite no-no. A diesel engine functions differently than its gasoline counterpart. 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. When you hear that sound, you know you're about to drive a rig. It makes the engine sound like a loose rattled piece of junk. The knocking is caused by the combustion explosion. I have been getting a injector knock from about 1700-2000 rpm for quite some time. How can a Diesel Engine be Converted to Biodiesel. 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. The normal diesel engine knocking is like a drummer hitting solid blocks of metal in regular timing. It does not do it when the engine is cold. Some manufacturers have created special engine mounts that help muffle diesel knock from passenger compartments. Sounds like lifter noise to me. Wouldn't this make a lot of sense considering everyone's focus on saving energy and being green? Fuel injectors make a sharp clicking sound, when they are functioning properly. After the injector went out in mine its like brj833 said.Sounds like someone under the hood with a hammer. 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. Braking knock; 1. In fact it is probably the biggest cause of an abnormally loud knock. It sounds like a badly adjusted set of solid lifters. This can cause serious damage as the fuel is not combusted evenly. The combustion process, under the high heat and compression, burns controlled and in so doing produces a "knock" sound. 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. With this type the noise is relatively low. 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. My car sounds like a diesel truck. Nothing catastrophic can happen to your engine from this type of injector 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). When you run diesel purge through your engine most of these noises will disappear within ten to fifteen minutes. Fuel injectors do make a noise, but it would usually be described as a “buzzing” rather than a “ticking”. 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. 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 They will tick, ping, rattle and they can even produce a snapping sound. Car seems to run fine. In a diesel engine, it can be a single fuel injector that is injecting droplets rather than atomizing the fuel. Most likely because the extra load has increased the compression in the cylinder and pre-ignition is occurring. How To Prevent Fuel Injector Problems. 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 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. Europe exports excess Gasoline into USA and USA exports Diesel into Europe. Out of the 5 trucks, I have fixed 4 completely by performing a fuel injection flush with BG chemicals from flemming distributing. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. For complicated reasons this feature has never caught on in the US. Engine noise sounds like diesel at idle. The timing of the fuel being injected into the diesel engine is critical to prevent parts breakage, which can result from severe knock. The sudden appearance of white smoke and a smoky waxy smell may indicate this. An injector stuck shut causes a lean misfire which causes the engine to hesitate and loose power but not knock. 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