N52 idle race/surge on cold start - BMW Forum - BimmerWerkz.com

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post #1 of 2 (permalink) Old 01-17-2013, 01:41 PM Thread Starter
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N52 idle race/surge on cold start

I have a 2006 530i with 133K miles. Have noticed recently that on a cold start (warm or cool, dry or wet weather, happens in all), the first time I engage the transmission in either D or R, doesn't appear to matter, I get an idle race/surge. Very brief, disappears once I lightly press on accelerator and car moves. I also get the occasional check engine light but not specifically associated with the events I just discussed. Have never replaced the pre or post cat O2 sensors or rebuilt the CCV system.

Anyone recognize the symptoms? Suggestion is it could be a vacuum leak, perhaps in the CCV system. Looking for guidance on diagnosis and where to start the remediation process.
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post #2 of 2 (permalink) Old 12-06-2013, 08:39 PM
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zombie thread, i have this same issue

2007 530xi...surging idle on cold start, goes away once i drive a little and it warms up. only an issue with the first start of the day, noticeable when you're intending to gently idle in reverse out of a parking spot and the car wants to leap out into traffic or an innocent bystander...demands extra attention with the brake pedal!

anyone have any insight into possible causes?
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