Closed loop problems? Idle fail on warm restart - 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 06-02-2009, 10:08 PM
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Closed loop problems? Idle fail on warm restart

Yes its the same topic that has had a bazillion hits before..don't worry i've checked them.

88' 320i 180K on the clock, Belts and seals changed (no inlet, exhaust or head gaskets done) Seemed to run fine.

Morning start up purrs like a kitty. After warm or on a warm restart after a 5 minute break, I sometimes get a sparadic chugging before car stalls. It doesnt happen every time either. If I drive with this senario it sputters up to 1500 rpm (feels like running out of fuel).

The fact it only happens when warm makes me think closed loop and so first port of call is O2 sensor. However what other inputs are taken into account when engine is warm that arent when its cold. I ask this because its perfect when cold started.

Also theres an article on pelican parts of a diagnostic test by pumping accelerator pedal 4 times in succession after a 1 slow initial pump when the key is at the accessories postion. I cant seem to get the check engine light (what ever that is? Is it the flashing "check light?") to flash any fault codes. Maybe if i could i would solve the above problem..

Many thanks from a newbie
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#2 (permalink) Old 06-02-2009, 11:13 PM
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I'd go find the coolant temp sensor and replace that first...probably less than $30. The coolant temp sensor is a major player in restart stuff..I'd start there first....good luck
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#3 (permalink) Old 06-04-2009, 07:56 PM
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and, actually, after thinking about that...if the temp sensor doesn't do it the next thing I'd look at would the fuel pressure regulator...the general tune up stuff would not fix varying performance throughout the operating temputure range. Tune up stuff would be more consistantly screwed up. Although I would do a complete tune up if you don't know when the last one was done.
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