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1996 BMW Z3 Rough Idle

Tiny
RHLONN
  • MEMBER
  • 1996 BMW Z3
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 72,000 MILES
My 1996 Z3 started to idle rough and the check engine light came on. I checked the code and it said "random misfire". I have replaced the Air filter, Fuel filter, spark plugs, coil pack, Wires, and Idle control valve, one after the other. There has been no change in the idle. The engine runs fine above idle speed and still gets about 29 to 30 mpg. But I keep geting the check engine light with the same code. I am lost at this point. Any help will be appriciated.
Rhlonn
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Sunday, January 27th, 2008 AT 8:03 AM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Might be an injector that is bad. Warm engine up and using a meter, measure the reistance across the injectors to see if one is out farther than the others
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Monday, January 28th, 2008 AT 7:48 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There is a PCV valve on the manifold that is bad. It is on top of the manifold.
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Thursday, January 31st, 2008 AT 5:58 PM

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