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Before I bought my 535i, it had a cold start problem and we took it to a dealer (funny how we had to make the owner get his car ready to sell!) because they're the only one that has the diagnostic tools to perform the tests needed to isolate the problem. They ended up replacing a faulty idel control valve and the fuel pressure regulator.
It sounds like you'd rather work on it yourself but unfortunately a lot of engines are so complex that the diagnostic tools are a must.
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Just once I'd like someone to call me "Sir" without adding, "You're making a scene."
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