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Misfires and rough idle.

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mjmallia:
Have you carbon cleaned the intake valves....they clog up and create misfires like I had once......lots of info on that one.

Skapligt:

--- Quote from: mjmallia on October 16, 2024, 08:52:38 am ---Yes, it would make it sound lumpy and the chain would most prob rattle

--- End quote ---

No rattle at all. No problems driving. Just problems at idle.


--- Quote from: mjmallia on October 16, 2024, 08:53:45 am ---Have you carbon cleaned the intake valves....they clog up and create misfires like I had once......lots of info on that one.

--- End quote ---

Yes I have cleaned it. It was not too bad with carbon.

Im out of ideas soon :(

mjmallia:
A boost leak will also give a very lumpy idle.

Smoke test it and check the hoses. I had a leak from the oil filler neck extension that gave me a lumpy idle.

 The bond had gone so had to remove it and mount the oil cap direct to the cam cover.......an easy check

Also the hoses off the PCV become very brittle and crack.....those were leaking for me also, soon after a carbon clean due to their removal.

Skapligt:

--- Quote from: mjmallia on October 16, 2024, 09:26:42 pm ---A boost leak will also give a very lumpy idle.

Smoke test it and check the hoses. I had a leak from the oil filler neck extension that gave me a lumpy idle.

 The bond had gone so had to remove it and mount the oil cap direct to the cam cover.......an easy check

Also the hoses off the PCV become very brittle and crack.....those were leaking for me also, soon after a carbon clean due to their removal.

--- End quote ---

I´ll have to do a smoke test. Any tips for that. How to do it properly?
I´ve sprayed all over the engine to look for leaks but nothing.

Did this give you misfires or just a rough idle?

PCV hoses are new.

mjmallia:
A very lumpy idle.

Are you sure they are misfires, as in you are counting them on VCDS

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