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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 03-31-2010, 08:06 PM   #1 (permalink)
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Cool 1994 530I Rough Idle Help Please

Help! I have a 1994 530i starts fine, but, when goes into idle starts to miss and check engine light comes on. Check engine light stays on and when mechanic uses computer to check codes it says oxygen sensor - already replaced both of those along with MAF, cold temperature sensor - anyone have any ideas?
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Old 04-13-2010, 02:49 PM   #2 (permalink)
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Check for vacuum leaks as this lets additional unmetered air into the engine and the oxygen sensors cannot control it (that's why you get that code). It could be your intake manifold seals or your PCV (at the back of the intake manifold).
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Old 04-13-2010, 02:56 PM   #3 (permalink)
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Second that ^ regarding hoses. Same issue with teh 740. Also replaced my fuel filters and she runs like a brand new sewing machine. Good Luck!
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Old 06-23-2010, 08:31 PM   #4 (permalink)
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Originally Posted by khs View Post
Help! I have a 1994 530i starts fine, but, when goes into idle starts to miss and check engine light comes on. Check engine light stays on and when mechanic uses computer to check codes it says oxygen sensor - already replaced both of those along with MAF, cold temperature sensor - anyone have any ideas?
I am having the same idle issue on my 2000 528i... almost sounds like it wants to stahl out at times...
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