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Old 04-13-2005, 11:21 AM
TurnAround TurnAround is offline
Location: Oregon
Join Date: Jan 2004
Posts: 358
Mein Auto: Z3C, Z3R, X5
Engine stumble / cough on cold start up

Every morning my X5 starts like ****. At least.. 9 months of the year. Only during the warmest summer months does she not do this.

I turn the key long enough to fully turn the motor over (just like the manual encourages you to do). Yet, every time... the motor stumbles (barely fires) and then coughs (small back fire sound coming from the engine bay). No back fire at the tail pipes. "ruckka tuckka".. almost stalls.. "cough (then a small bang / ca-chunk sound)". Then rough idle for 5 seconds. Then all is fine.

My dealership's mechanic is really good. He almost never gets stumped on a problem. But, they say they cannot reproduce the problem. They've kept the car over night on two occassions. Nadda. No engine error codes either.

My driveway is on a slight down hill. Could this contribute to it? But I've parked her nose first (slight up hill then) and she still does it.

This can't possibly be good for my engine. She sounds terrible. I've resorted to giving it a little gas at start up. If I just baaaaaarely give it a tiny bit, she starts beautifully. The danger is though, that you give it too much. Then the engine starts with a .. VAROOOOM, which isn't good for the engine. Darned electronic throttle makes it really hard to get it just right. Teaching my wife how to do this... not really fair to her. Mechanic says NOT to start it this way. What choice do I have tho ! ?

Anybody else getting this?

Cam sensor? Some start up idle circuit set too low? Any insights appreciated. Thanks guys.

'02 Z3 Coupe 3.0i [Hellröt II - Walnuß]
'03 X5 3.0i [GrauGrün - Beige]
'01 Z3 Roadster 3.0i [AlpenWeiß - TraumRöt]
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Old 04-13-2005, 12:01 PM
vinu_neuro vinu_neuro is offline
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Location: Chicago
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Mein Auto: -
ignition coil?
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Old 09-02-2006, 10:00 PM
charlesey charlesey is offline
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Location: Boston
Join Date: Jul 2006
Posts: 25
Mein Auto: 3 Series
Did you get it fixed ????
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Old 09-02-2006, 11:42 PM
AW328i AW328i is offline
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Location: Colorado
Join Date: Aug 2006
Posts: 1,197
Mein Auto: 2 cars and a truck
Maybe dirty fuel injectors or fuel filter. You say when you give it a tiny bit of gas it starts beautifully, so I'm thinking it's a fuel problem or like neuro said ign. coils, maybe spark plugs too. Try running some good fuel injector cleaner in there.
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Old 11-30-2012, 11:57 AM
blakey2000 blakey2000 is offline
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Location: raleigh, nc
Join Date: Nov 2012
Posts: 15
Mein Auto: 2001 x5
vanos issue, common.....stuck exhaust deal in the vanos. Mine does it.
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