BMW M3 idles ruff

BMW M3
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BALL_OF_FIRE
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I own a 1997 bmw m3 with automatic trans. The car runs great for the most part but when I start it up after a night of sitting it idles ruff for a few minutes then it's fine after that. the car does not really idle ruff if i start it a couple hours later either. So what do you think is the cause for ruff idle :( ?
Oct 27, 2007 at 1:24 AM
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MERLIN2021
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My guess is the electronic coolant temp sensor...
Oct 27, 2007 at 9:26 AM
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BALL_OF_FIRE
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it does have a message to check coolant level but it's full, I never would have thought it was a coolant sensor causing the ruff idle. Can you tell me why the coolant sensor is the cause?
Oct 27, 2007 at 11:32 AM
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MERLIN2021
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On today's cars it acts much like the old choke on caburators! This is not the level sensor on the recovery bottle, it's usually on the block or head...
Oct 27, 2007 at 3:55 PM
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STRAILER
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Also, try loooking at the air intake boot, and check for vacuum leaks. Please let us know, thanks for visiting 2carpros.com
Nov 1, 2007 at 11:09 AM