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Join Date: Jul 2009
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2008 Mini Cooper S R56 Misfire all 4, rough idle, barely starts when cold

Hi guys

I'm running out of hair to pull out. I have an 08 Mini Cooper S turbo 98k miles automatic.

When it's cold it barely starts and i have to step on the gas. still then it struggles. once the car is warmed it runs fine. My Rpm struggles at times where it practically shakes the car. When it's cold and I drive it after a couple of minutes of turning it on, it has a hard time changing gears so i have to use the paddles. Once the car is warm it drives fine, but still idles rough just not as bad as when its cold.

I have replaced All spark plugs, High pressure fuel pump, thermostat and housing. Not really sure what else it could be. Bluedriver OBD code is just P0300 (random/multiple misfire) and P0301, P0302, P0303, P0304 each cyl misfire

Any help would be great. Thanks in advance
Old 01-09-2019, 11:50 AM
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Have you checked the injector's current and voltage with a scope? The transmission issue sounds separate. I have also read that the coil-packs on the R56 cause issues - esp with cylinder 3 and 4.
Old 01-10-2019, 12:32 PM
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I have 2 R56 non-turbo cars, but I have had many hot rods, and muscle cars in my lifetime.
There are many things to look at for diagnosing and rulling out potential performance problems. I have learned with my coopers how critical the timing chain is to the car running smoothly. The valvetronic system working perfectly, oil pressure, Lifters(tapets), Injectors, Cam sensors, Vanos sprockets and Selenoids and engine vacuum.
*Something that I recently discovered was how critical the crankcase vacuum is to the car running good. Do this test, pull off the oil filler cap, while running, and wait for a few minutes. It should die from lack of vacuum. It should almost start stuttering within seconds of removing the cap. You cold have a bad PCV valve( part of the valve cover) that is leaky, could have a bad oil filler cap seal or its just missing. could be a bad PCV line that runs from the valve cover to the intake. Could be a bad seal around a cam sensor in the valve cover or just a bad valve cover gasket. It might be more serious than that. But with good compression, to have a whole string of misfires, that sounds like a vacuum issue to me. Especially since it gets somewhat better after the car warms up, seals tend to expand and close small gaps when warmed.

The big 3 for misfires that you need to troubleshoot are: Compression, Ignition and fuel delivery. With the R56, vacuum plays a big role.
Good luck

Last edited by 08&09R56coupes; 01-17-2019 at 08:37 AM..
Old 01-17-2019, 08:34 AM
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