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Diesel engine..it sounds like a cold start engine all the time its running. loud knock. Company is saying its okay....it has to do with fuel system..can they be right

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It can also be a bad injector.

Posted on May 19, 2017

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  • Cars & Trucks Master
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Spark knock is an indication of over advanced injection timing. It can result in piston damage. Check the ODBII scan for a coolant temp. sensor problem. It may be staying in open loop (ECU Cold Start mode). Presence of 180 degree coolant signal to ECU will trigger closed loop mode. (normal run mode, Lean fuel map).

Posted on May 19, 2017

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2 Answers

Have a Isuzu 4hg1, assembled the engine and started it. I run it for two kilometers n hear the knocking sound n believe its a fuel knock. How can I fix the abnormal sound?


at idle only, when,does it knock.... wow.
no car stated, sure a huge truck,, 4.57 Liters small.lol
what truck? my guess NPR huge.
is the TURBU -T 4HG1-T?????
Applications include the 2000 Isuzu NPR350A
what year.?
what country?
we know its a diesel"H"
but old ones all knock, (detonate)with mech,injectors, (for sure at idle !!!)

on a new trucks not(with common rail,? direct injection and smart EFI controls)knock ends.

see the old engine
has 9degree injector pump timing
do that? got that?
the new NPR trucks sell this same engine
with Direct injections,knock?
,my guess. a leaking injector DID. if new truck>?
direct injected, is it?
or EFI brain stuck on limphome ,mode ,scan it?

see why not staying year, is IMPOSSIBLE:
the engines in 2000 are NOT same as now,
totally different efi fuel systems.1024092b-cf5d-4452-8e68-40060a48c7e5.jpg

Feb 17, 2017 | Isuzu Cars & Trucks

1 Answer

I have a mitsubishi delicia 2.8 diesel that has a knock on start up but goes away after a bit (about 30 seconds) sounds ok when been running,worse when starting up from cold.thanks


There are many things that can cause an engine to "knock" on startup. For diesel engines, an injector that is leaking and dripping fuel into the cylinder after engine shut down, can definately cause this. However, injector balance tests, as well as other tests should be performed to identify the exact cause of your problem. If it is an injector, the cylinder balance test will tell you which one.

May 19, 2012 | Mitsubishi Cars & Trucks

1 Answer

My girlfriend filled my tank with diesel and now the car will not start or run. Obviously. What would be the easiest way to fix this problem? I have a 2007 ford five hundred.


Remove as much diesel fuel as possible from the gas tank and refill it with gasoline. You may have to crank the car to purge the diesel fuel out of the fuel lines. After that, it should start and run okay. There should be no damage to the engine from the diesel fuel.

Fill it up with the highest octane fuel, use gas treatment and fuel injection system cleaner, and drive the diesel out of the system. The car will not like it, the engine may knock and stutter and generally not want to cooperate. After a few tanks of good gas and gas treatment and engine cleaner you may consider replacing the fuel filter. If this solution worked, it would be the cheapest.

Apr 12, 2010 | 2007 Ford Five Hundred Limited Sedan

2 Answers

07 Ford Diesel has trouble cold starting. Problem has recently gotten worse. Any suggestions or other with this problem?


just had to have the fuel injectors replaced, we thought it was the glow plugs but it wasnt. when it starts does the engine sound like its knocking real loud and have less power when you try to go???

Feb 16, 2010 | 2007 Ford F-250 Super Duty Lariat

1 Answer

Knocking-Tapping noise


hi, is this tapping loud, they are normally clattery, especialy if fitted with a lucas or cav fuel pump.
an injector has lots of smoke and thumps in most cases.
get back to me

Aug 18, 2009 | 1987 Peugeot Liberte

1 Answer

1998 Audi A4 Quattro Engine Noise


the timing is too far advanced at the time of the noise, the "diesel knock" is detonation

or this could be from using fuel with a low octane rating, try premium or octane booster.

or may have carbon build up in the conbustion chamber causing fuel to ingnite while entering cylinder

Jun 24, 2009 | 2005 Audi A6

2 Answers

Knock in engine


it can also be an injector. injectors tend to supply more diesel after long service. To check if this is the problem: let the motor idle whilst it knocks. start from the front of the motor- loosen no1 injector fuel line- the motor will start idling roughly as fuel supply to no1 piston is starved. If the knock persists, tighten the fuel line and move to no2 injector and repeat the process. the knock will gradually go away if one of the injectors' fuel lines are loosened and the injector is faulty. If you get 1 or more injectors with these symptoms, remove and replace the injector. If the problem persists, it can either be that one of the diesel pump plungers are worn and supplies too much fuel or a big end bearing is faulty.
RegarsCarel de BeerSouth Africa

Apr 06, 2009 | 1991 Toyota Celica

2 Answers

Isuzu 2001 diesel engine won't start


cant start deisel 3.0 lilter sounds like there is no fuel getting to the engine

Jan 19, 2009 | 2001 Isuzu Trooper

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