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1987 BMW 325 idle rough

Tiny
GREATCAST
  • MEMBER
  • 1987 BMW 325
  • 6 CYL
  • 2WD
  • MANUAL
  • 125,000 MILES
Hi Sirs.
The engine idles hi-lo, hi-lo, and rough when engine is either cold and hot.
i disconnected the wire to the idle control valve, engine went to about 1500 rpm and then hi-lo, hi-lo but not rough, as soon I connected the wire back, it back to the same problem.
i suspect is the idle control valve, but would like to be sure, how can I check it with ohm meter, and what it should read on the ohm meter.
Thank you.
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Tuesday, January 19th, 2010 AT 10:18 PM

3 Replies

Tiny
2 CARVINCE
  • MEMBER
  • 31 POSTS
To test an idle you need a wired harness that is dealer only the best thing to do is pull the valve off and spray some contact cleaner in it and blow it out til its dry and see if problem still exists, if so replace the valve.
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Wednesday, January 20th, 2010 AT 8:41 PM
Tiny
GREATCAST
  • MEMBER
  • 2 POSTS
Thank you guys.
I did just that, and I make it sure there are no air, fuel leaks any where.I'm just going to replace the valve.
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Wednesday, January 20th, 2010 AT 10:47 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
The car may be in need of an idle control unit and an idle control valve.

Also the correct valve lash is important as is the plug gap and the correct plugs. State of tune is a factor.
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Thursday, January 21st, 2010 AT 9:22 AM

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