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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Morning Longer Crank Time?



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      11-27-2012, 05:34 PM   #23
m1bjr
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Quote:
Originally Posted by Dragon88 View Post
Just an update.

Since I had the O2 sensor replaced, I've not had the longer crank occur. Reading another post in the forum, the faulty O2 sensor may have caused the car to over-fuel and result in a longer crank as there's more unburnt fuel in the engine somewhere.
Coincidental I'm afraid.

The closed loop fuelling using an O2 sensor is not operating from a cold start anyhow.
O2 sensors need to heat up to opwrate nd it takes a few seconds at least.
On cold its running a fixed mixture enrichment cycle for a few seconds anyhow.

Common cause of intermittent starting is a weeping injector dropping fuel into a cylinder overnight as pressure stays in the rails of the DI engine.

I had this a couple of times and it was not 'regular' so guess sometimes the things dont drip
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