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MINI MINI Cooper, MINI Cooper S: 2007 and later Rough Idle, not HPFP related

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Registered: 01/04/17
Rough Idle, not HPFP related
Posted: Jan 4, 2017 7:03 PM
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I had faulty HPFP on my MINI Cooper S 2008 (R56, N14 engine). It's solved for few months, but now having another issue. At cold starts my car is having very rough idle. It's getting a bit better when warmed, but still not perfect. Timing is jumping from negative 5 up to 12 degrees. Coils, sparks, head cover replaced, intake valves cleaned. No effect at all.

This is the video with EXACTLY same behavior: https://www.youtube.com/watch?v=VaLdB_9avRk

I can capture my video if needed.

PS. Chain and tensioner are NOT yet replaced (I got the kit but need to narrow the issue down first).
No error codes apart from random misfires across all cylinders, which makes sense on those negative to positive angles. Compression is above 160 all around.

Also, post catalytic CO2 is showing constant 0.0000134 volts, which doesn't make sense, but couldn't fix it so far. Perhaps wiring issue, but want first to know if it's related or not (not sure co2 sensor can affect the mixture from cold starts).

No adaptation done before/after valves cleaning.

Thanks in advance, any help is highly appreciated.

Edited by: RTete on Jan 4, 2017 7:04 PM

Edited by: RTete on Jan 4, 2017 7:05 PM

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