E60 M5 Unstable Cold Idle

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I’ve been experiencing this unstable idle during my “cold start” mornings. Idle fluctuates under 1k RPM for approximately 5-10 seconds before stabilizing. Spark plugs just replaced w/ factory spec ~75 miles ago. No codes stores in INPA. Any ideas?

Update: pulled all four VANOS valves cleaned, replaced O-rings w/ Vitons. Re-installed and ran bleeding procedure with DIS four times. Then, reset DME adaptations. Engine idle returned to normal.

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By | 2016-12-20T16:58:03+00:00 December 20th, 2016|Categories: BMW Cold Start|0 Comments

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