89 325i Bucking!!! - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 12-12-2008, 05:53 PM
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89 325i Bucking!!!

This thing is surging at just above idle like you wouldn't believe! It does it intermittently and is so bad it is as if you floor it and let off as fast as you can. Then it will disappear like magic.
Can't see any trouble under the hood. Gas is new and treated with gas dryer hoping to fix it.
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#2 (permalink) Old 12-12-2008, 05:56 PM
OMFG another one!?
 
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Have you checked the intake boot for cracks? That was the problem when my 325i acted that way.

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#3 (permalink) Old 12-12-2008, 06:13 PM
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Yep.
I will be testing the Mass airflow meter tomorrow. Anybody know what pins to test and what resistance values I should get?
In case I forget, Thank You in advance .
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#4 (permalink) Old 12-13-2008, 06:44 PM
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Mass air tested good. I checked every sensor I could find. Checked the fuel filter. I have no clue. It will do it randomly in any driving condition. Even cruising down the interstate. But you can let off and it will idle.
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#5 (permalink) Old 12-16-2008, 07:04 PM
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check the resistance on your plug wires check the entire ignition system mine was doing that and I check the plug wires and one had no resistance at all so I changed them they ran me about 90 bucks from autozone and that was with a commercial account
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#6 (permalink) Old 12-17-2008, 08:47 AM
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Well. The problem disappeared as quickly as it appeared. I really wish that I could figure out what fixed it.
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