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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 09-14-2009, 07:30 PM   #1 (permalink)
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Rough Idle when cold, Fine when warm

Got a 1995 525i and whgen i start it in cool mornings it idles rough till warms up then idles and runs perfect, If it is a 90 degree day out it starts and runs fine and does idle rough at all...Anyone had this problem and may suggest a fix, I am a newbie to the beemer world....
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Old 09-15-2009, 02:19 PM   #2 (permalink)
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There is an air intake temperature sensor. on M50 and M60 engines. It senses the air temp in the intake manifold. The signal is used for adjusting fuel injection and ignition timing. I'm just guessing if it could be the problem but it might be a good place to start.

You can Google air intake sensor 1995 525i and see if there's any technical info about it.

The Bentley manual has info on how to test it. Doesn't look like an expensive part to change if thats the case.
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Old 09-15-2009, 03:21 PM   #3 (permalink)
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I had this problem with my 528i (2000/M52TU) before. It was my crank case vent valve. On cold days the valve would open all the way and cause a massive vaccuum leak. I even had the car stall on a few occasions because of it. It is a common problem with these cars and I would also get your ICV cleaned while you're at it.
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Old 09-16-2009, 05:53 PM   #4 (permalink)
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Thanks I am out of town and will let that be my start to see if that may be my problem
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