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Misfires and rough idle.

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Skapligt:
Hello!

I thought I should try this forum since nothing else helps and Im out of ideas.
Sorry for questionable english but Im from Sweden.

SOOOO

I bought a Golf GTI 2 weeks ago, knowing it ran very bad.

Started cleaning plugs which helped but still lots of misfires.

Changed plugs, no improvement
Changed 2 injectors which were bad. The other 2 works fine
Changed coils, no improvement
Changed PCV, no improvement
Cleaned valves from carbon, no improvement

Some things I have noticed.
If I take out oil stick with engine idle it goes rough and when I put it back in it runs good for a while. Then rough again. Same with oil cap for filling.
Pretty much water/oil? in exhaust. Puddle behind car after some idleing.

I have VCDS and have checked alot with it. But not really sure what is good and what is problematic.

Compression test was good.

What is the next step for me?

I have searched alot of forums and tried it all but nothing seems to help.

Thanks in advance.

PorkPieBandit:
Have you tried unplugging the MAF and seeing how it runs? If it runs better unplugged could be that needs replacing.

mjmallia:
When was the cam belt done? timing chain done? Cam adjuster oil pressure rings checked?

Skapligt:

--- Quote from: PorkPieBandit on October 15, 2024, 12:55:47 pm ---Have you tried unplugging the MAF and seeing how it runs? If it runs better unplugged could be that needs replacing.

--- End quote ---

Yeah tried that also. No difference :(



--- Quote from: mjmallia on October 15, 2024, 01:58:01 pm ---When was the cam belt done? timing chain done? Cam adjuster oil pressure rings checked?

--- End quote ---

I will check the rings. But would that just affect idle? It only misfires on idle now. And now most on cylinder 4. A couple of days ago it was cylinder 3 that was worst.

mjmallia:
Yes, it would make it sound lumpy and the chain would most prob rattle

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