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In an effort to slowly diagnose my damp weather misfires, which I honestly believe are a product of carboned intake valves, I first seafoamed then changed my plugs. Can't tell whether this has taken care of the problem just yet as I have yet to try a cold star in damp weather, but the car certainly runs smoother and slightly quieter. For those who are interested in what OEM plugs look like after 65k miles:
I'll update everyone once I attempt a cold start in optimal problematic conditions.
Looks a bit rich and the gap is definitely excessive, probably didn't hurt yourself by changing them, as they are rated for 60k miles anyway.
Have you done a compression test?
It's rare that all 4 coils fail at the same time on these cars, let alone 2 at a time. A walnut blast definitely won't be a bad idea either at 65k miles.
Have you had the car scanned with a professional grade tool? If not there may be more to the story that you aren't seeing yet.
Looks a bit rich and the gap is definitely excessive, probably didn't hurt yourself by changing them, as they are rated for 60k miles anyway.
Have you done a compression test?
It's rare that all 4 coils fail at the same time on these cars, let alone 2 at a time. A walnut blast definitely won't be a bad idea either at 65k miles.
Have you had the car scanned with a professional grade tool? If not there may be more to the story that you aren't seeing yet.
I do receive the intermittent p2188 (I think) code stating that it runs rich which I associated to my Alta intake based on what I've read on this forum. As for the coils, I haven't tested them out but my misfires usually occur on 1 and 3 (p0301 and p0303) although I've had all coils misfire at the same time on 2 separate occasions.
If you had all 4 cylinder misfiring at once I would attribute it moreso to carbon buildup or lack of fuel (HPFP failure) than having all 4 coils failed.
The intake won't give you any mixture codes, it is pre MAF sensor. It may only be hurting your low end torque curve.
If you had all 4 cylinders misfiring, the rich condition makes sense as you are expelling a more raw fuel mixture into the exhaust than you would be if the car was running optimally.
If you had all 4 cylinder misfiring at once I would attribute it moreso to carbon buildup or lack of fuel (HPFP failure) than having all 4 coils failed.
The intake won't give you any mixture codes, it is pre MAF sensor. It may only be hurting your low end torque curve.
If you had all 4 cylinders misfiring, the rich condition makes sense as you are expelling a more raw fuel mixture into the exhaust than you would be if the car was running optimally.
Completely agree, I'm almost certain it's due to carbon build up
I'm having some persistent misfire issues as well I've got a 2011 cooper s with jcw tuning kit. it all started at about 70k miles. Got around to replacing the plugs on my own with beru oem replacements and it seemed to really help. My codes went away for a few days then returned. I keep getting p0304. The plugs were in what looked like terrible condition to me
I drive mostly highway and almost always smell fumes when I come to a stop. The idle is smooth but when I start to coast I can feel the inconsistent power caused by the misfire. Anybody have any ideas to the resolution of the problem? I'm sure it needs a walnut blasting and I'm considering replacing the coils.
01-08-2016, 10:35 AM
