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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Upon starting car - what rpm does your engine idle at (non cold-start)



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      11-02-2012, 11:27 PM   #1
335terp
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Drives: 07 335i - 50k mi
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Upon starting car - what rpm does your engine idle at (non cold-start)

I've noticed my idle rpm's dropping to about 600 rpm's when I first start my car. No problems driving it. I've had the car for about 2 months and started to notice the lower idling roughly about a month ago - it usually starts around 1000 rpms and gradually drops over the 30 seconds to 1 minute. The low idling is accompanied by a little vibration/rumbling.

If this is normal, then I apologize about the shitty post - but I didn't find anything that was this specific in any of my searchesz. This is my first 335.

'07 with 49k miles currently.
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      11-02-2012, 11:49 PM   #2
TheBingoBalls
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It's normal in the sense that a lot of people are experiencing this type of vibration at idle without any other problems to the car. Using a OBD reader, RPM's will settle at exactly 660 RPM when warm and is when the vibration will start and go away with just a little of throttle.

The issue with "vibrating" is that it's subjective and differs from person to person and the first thing people are going to recommend you do is check MAF sensor, the air intake and the spark plugs but chances are that's not going to fix anything.

What I'm experiencing is probably the same as you. Sometimes when you're at idle or at a red light, the RPM won't even drop to 660 RPM, it'll stay around 750 where there is no vibration. It's definitely an annoyance but something you just learn to accept if there no other problems with your car.
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