Knoking sound when accelerate, idle is good
Most likely the valves do to worn valve springs
Not sure what you mean by opening the engine.
The combustion process of a diesel is not the smooth burn and increase in pressure of a petrol engine but is virtually an explosion causing a sudden rise in cylinder pressure. This is the source of the typical diesel knock and is more pronounced in some engines and some injection systems, especially when accelerating. It can be scary for those unfamiliar.
Electronic control tends to soften the noise.
Knocking might be the result of a mechanical problem (piston, connecting rod bearings, etc.) but if these things have been eliminated other causes of excess knocking can be excessive injection timing advance, dribbling injectors, bad spray patterns...
that is the problem excessive injection timing advance
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SOURCE: 4d56 engine knoking noise
I see that the engine is a Mitsibushi and suppose to be quite common. There are rebuilds and used engines on EbayUK.com.
Do a Browser search and you will find Repair manuals and possibly a Blog about this series.
Most of the knocks in an engine fall into several catagories. Lean fuel ratios and the failing of a knock sensor and poor fuel. The other catagory is excessive clearance in bearings in the crankshaft, camshaft, or rods.
You can buy an octane booster to add to the gas fuel, be careful if it is a Diesel. There are additives to raise the Cetane rating of Diesels too. If the noise leaves with the additives, you may have a bad "Knock" sensor or bad fuel.
Check your fuel pressure. If the pressure is weak, then the fuel charge is thin and then a "Knock" sensor can not adjust the problem away.
Over advanced timing. If the timing is too far advanced the engine can "Knock". You have to look at all mechanical components that affect timing.
There are varying intensities of a noise which leds to a diagnosis. It is something that has to be experienced and talking about it can not adequately express it. Try the few solutions I mentioned.
There is a website, Aboutautomobiles.com,which has a history of consumer complaints and resolutions by year, make, and model. You might find a clue there.
I hope my solution helps.
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Hi julius
What is the make, model and year of the car or truck?
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