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1995 BMW M50 Surging idle while stoped

Tiny
CRAZYALF
  • MEMBER
  • 1995 BMW M50
  • 2.5L
  • 6 CYL
  • RWD
  • MANUAL
  • 150,000 MILES
The car is a 1987 325is with a 95 m50 swap. I did not perform the swap and bought it with this issue. The current things that have been replaced are Mass air flow, intake hose, ICV 2 times and supposedly vacuum lines were checked. The person I bought it from says that his mechanic was 95% sure it was because of the 02 sensor. I find it hard to belive that it would surge from 800rpm to 2500rpm only while not moving because of that though. I am stumped and would appreciate the help!
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Thursday, August 13th, 2015 AT 4:37 PM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There is something in the ICV or there is a vacuum leak
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Monday, August 17th, 2015 AT 8:16 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
I meant the ICV driver
might try smoke testing the intake for leaks
might try another DME too
I will repost if I can think of anything else
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Monday, August 17th, 2015 AT 8:18 AM

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