08 335xi, still under cpo, stock hardware, 92k miles.
Upon cold start and putting into gear mild shudder/roughness is felt. I have inpa lpfp is reading around 5000 hpa hpfp 50000 hpa, fuel trims around +3/4%. Zero codes stored, drivability and power delivery are perfect just off idle and when warm disappear completely.
Am I dealing with an injector issue? Plugs are 3k old there is no misfire so what do I do? Bring it in leave overnight and have them start it in the morning to experience the cammed v8 effect at low rpm? I suppose it could be carboned up valves but its smooth as glass above idle and idle is fine once operating temperature is met.
Seems pretty much impossible to troubleshoot short of pulling plugs overnight and checking bores for fuel dilution. Any tests/data I can reference in inpa to go in the right direction?
Car did get 4 new jects under recall in 2011 before I bought it as well as a rear turbo and hpfp. Aside from dodgy cold start behavior that just began it runs perfectly including idle once at operating temperature.
Ofh was done by cpo 3k ago which meant intake manifold off, would they have made mention or addressed carbon problem at that time?
I guess I now join the ranks of the troubleshooting brigade. Also worth mention wot bank 2 is always +8% over bank 1, most logs I view are consistent however afr is maintained.
More knowledgeable than me, please chime in
Upon cold start and putting into gear mild shudder/roughness is felt. I have inpa lpfp is reading around 5000 hpa hpfp 50000 hpa, fuel trims around +3/4%. Zero codes stored, drivability and power delivery are perfect just off idle and when warm disappear completely.
Am I dealing with an injector issue? Plugs are 3k old there is no misfire so what do I do? Bring it in leave overnight and have them start it in the morning to experience the cammed v8 effect at low rpm? I suppose it could be carboned up valves but its smooth as glass above idle and idle is fine once operating temperature is met.
Seems pretty much impossible to troubleshoot short of pulling plugs overnight and checking bores for fuel dilution. Any tests/data I can reference in inpa to go in the right direction?
Car did get 4 new jects under recall in 2011 before I bought it as well as a rear turbo and hpfp. Aside from dodgy cold start behavior that just began it runs perfectly including idle once at operating temperature.
Ofh was done by cpo 3k ago which meant intake manifold off, would they have made mention or addressed carbon problem at that time?
I guess I now join the ranks of the troubleshooting brigade. Also worth mention wot bank 2 is always +8% over bank 1, most logs I view are consistent however afr is maintained.
More knowledgeable than me, please chime in
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