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4.8 (N62) does not have an idle control valve. You have valvetronic instead. If you aren't finding an answer searching here, look on the E60 and E65 forums for your symptoms. Or try the E70 forum also.
Guesses: CCV's going bad, MAF needs to be cleaned, air filter is dirty/clogged, dirty/clogged injectors, fuel pressure regulator having issues. Other ideas I have would also cause a check engine light, these are the only ones I can think of that could cause rough running without the check engine light. Scan the DME to see if there are any faults (pending, present, historical).
Bad gas? Carbon buildup? What's your typical drive cycle? Fill up with some good quality premium fuel, throw in a bottle of Techron concentrate and go for a couple hour drive on the highway. If that fixes it, it was just bad gas or dirty injectors.
You are very lucky to have a car with only 120kilometers on it. Unless you mean 120,000km. Bad gas? Carbon buildup? What's your typical drive cycle? Fill up with some good quality premium fuel, throw in a bottle of Techron concentrate and go for a couple hour drive on the highway.
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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