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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 10-12-2008, 11:11 PM   #1 (permalink)
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1994 530i Check Engine Light On!

Hi! Last week i was driving my 1994 home from work and my check engine light came on. After the light came on my car would barely run at idle speed and even stall, and seemed to be running rough. The next day the check engine light went away and the car ran smoothly all day. The next day the check engine light came on and was even flickering on and off while driving on the highway and i had the same problems with the rough idle and rich smell from my exhaust while stopped. I didn't check the codes yet to see what it could be.

Could it maybe be the o2 sensors or even the air flow sensor that would cause these symptoms? Any help would be greatly appreciated. Thanks.
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Old 10-13-2008, 11:36 AM   #2 (permalink)
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Yes, or it could be the PCV valve, I would go for air flow sensor first.
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Old 11-18-2008, 11:12 PM   #3 (permalink)
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Any resolution to rough idle?

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Originally Posted by E34HartgeH5 View Post
Hi! Last week i was driving my 1994 home from work and my check engine light came on. After the light came on my car would barely run at idle speed and even stall, and seemed to be running rough. The next day the check engine light went away and the car ran smoothly all day. The next day the check engine light came on and was even flickering on and off while driving on the highway and i had the same problems with the rough idle and rich smell from my exhaust while stopped. I didn't check the codes yet to see what it could be.

Could it maybe be the o2 sensors or even the air flow sensor that would cause these symptoms? Any help would be greatly appreciated. Thanks.
I'm experiencing the same symptoms on my 94 530i. Curious if you have found the problem and if so, what the resolution was. I'm waiting for my OBD cable to arrive so I can check the codes.
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