1999 BMW Z3 Problem with warm starts

1999 BMW Z3
65,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MWWARDY
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The problem is when z3 2.8 starts from warm (eg after stopping at a petrol station for a few minutes) it drives sluggishly and very occasionally stalls. Also in cold weather it is harder to start from warm (which causes the airbag light to come on after a few turn-overs). It always starts and drives perfectly from cold. Any suggestions?
Aug 13, 2008 at 3:30 AM
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DOCHAGERTY
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The hard hot start could be the purge valve being stuck open, they fail quite often P/N 13-90-1-433-603. As to the airbag light coming on, the car might have an airbag issue and the only recommendation I can make is to see your friendly local neighborhood BMW expert and have the supplemental restraint system inspected.
Aug 13, 2008 at 7:33 AM
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MWWARDY
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Thanks for the reply. Would the purge valve being stuck open also cause the sluggishness when being driven after a hot start?
Aug 13, 2008 at 8:40 AM
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DOCHAGERTY
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It could because of the raw fuel vapors being introduced into the intake system.
Aug 14, 2008 at 12:27 AM
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MWWARDY
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Thanks for your help - it was in fact a faulty cam shaft sensor.
Aug 28, 2008 at 9:55 AM
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DOCHAGERTY
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You didn't mention the check engine light being on or that you had not scanned for faults.
Aug 28, 2008 at 8:59 PM