Rough idle on startup.

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Joined: Sun 08 Feb, 2015 12:02
Posts: 70

  Z3 roadster 1.9

Rough idle on startup.

Post by Cheeseandbeans »

Evening all. My 2.8 drops revs when I first start it up. Some times it will cut out other times it just dips in revs and goes normal for a while. Once it's warm it's fine. Any idea where to start?

Here's a video recording of the issue. ... 0dd2238bb0

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Joined: Thu 23 Jun, 2016 01:26
Posts: 85

  Z3 roadster 3.0i

Re: Rough idle on startup.

Post by NZ00Z3 »

A rough idle when cold and a good idle when hot is an indicator of a vacuum leak somewhere after the MAF. Have a good look at all of your boots, hoses etc for cracks and breaks. Alternatively, get a smoke test done to see where the leak is.

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