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Old 03-19-2007, 07:15 PM   #1
Mavrick
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E34 Idling Rough.

1990 535i - the car idles too rough, vibrates etc.. its hot high miles, closing on 300 000k. Runs smooth off idle. Plugs are good, don't see any wires arcing, has a new fuel filter. Where to start diagnosing this?
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Old 03-19-2007, 09:44 PM   #2
E34 525i
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im preety sure that my buddie had the same problem with his 89 535...i think it was the fuel presure regulator...it might be cloged, so get some carb cleaner and some Q-tips, clean it up and it should be it...
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Oh, also wondering why that ****in thing is so quick lol.
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Old 03-19-2007, 10:57 PM   #3
Mr.535
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It was the idle control valve and mass air flow Mohammad. Ive had 2 535's and both the same deal.
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Old 03-19-2007, 11:32 PM   #4
Mavrick
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Mr.535, what do you suggest?

Clean the IAC with carb cleaner.. what about the mass air meter?
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Old 03-20-2007, 02:34 PM   #5
E34 525i
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Sorry MIKE... my bad... it was the idle control valve, i got the two parts mixed up...
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Oh, also wondering why that ****in thing is so quick lol.
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