Technical > Engine and Transmission

Idle issues on cold start

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Shamas85:
Need some advice please guys.

Went out in the G40 today. Started on the button like always. Let it idle from cold for a few mins and every time i didnt tap the accelerator to keep the revs up, the revs dropped below 1000rpm and the engine kept stalling itself.

Took it for a drive to warm it up, came home and it was idling perfectly just on 1000rpm. Any ideas what that could be? Idle control valve? Idle adjustment screw needs a tweak?

Cheers.

hayesey:
I'd suspect a temperature related air leak somewhere.  Could be the aux air valve, they can be a pain and stick open sometimes.  Could be one or more worn vac pipes that are opening up sometimes when it's hot.

Shamas85:
Thanks for the info. 

I’ll check the aux air valve and condition of the vac pipes.   

Would a dodgy blue temp sensor cause these symptoms?

ereeiz:
Look up "diagnostic guide" on here. Haysey and a few others made a topic that contains info on testing all your sensors and so on.

Shamas85:
Nice one, ill take a look at it.

Cheers

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