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Knock trim while no threshold is exceeded

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Hi there,


Maybe you have some insight in this. I see knock trim while the noise is not exceeding the threshold. In the attached example you see that cyl 5 does exceed the threshold but all cylinders show a trim. You guy's have some insight on this?


An other question, while im at it: on a warm start(ECT:90C) the engine is running lean for a short period of time(2 mins) which is normal. Is there any way to compensate for this?


Thanks a lot!


Kind regards


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If that's a PCLink log then it is possible that knock occured on all cylinders but the log wasn't fast enough to capture it.

Have a look at the post start enrichment settings if the engine is lean for a time after startup.

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