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      06-13-2010, 01:27 PM   #2
martho05
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Drives: 2010 335i xDrive Coupe
Join Date: Jun 2005
Location: Fenton, MI

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I have a MY10 335i Coupe xDrive and I am having similar issues. The car starts running rough and Service Engine Soon light comes on. Shut it off for a few hours and it runs normal and light goes out. The dealer just replaced spark plug and ignition coil in cylinder #1 and a few days later - IT DID IT AGAIN! So far, there are no signs of an actual HPFP issue according to BMW. After owning the car for about 7 months, I am finding out that the N54 is really an unstable engine. I owned a MY06 330i Sedan with the N52 and never had a lick of engine trouble....