1996 BMW Z3 Rough Idle

1996 BMW Z3
72,000 MILES • 4 CYL • 2WD • AUTOMATIC
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RHLONN
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  • 1 POST
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
Jan 27, 2008 at 8:03 AM
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2CARPRO JACK
  • ✓ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
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
Jan 28, 2008 at 7:48 AM
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DOCHAGERTY
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  • 9,606 POSTS
  • ASE Certified Mechanic
there is a PCV valve on the manifold that is bad. It is on top of the manifold.
Jan 31, 2008 at 5:58 PM
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