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91 318is (M42 engine) Idles and runs rough

Tiny
DMSSEYJ
  • MEMBER
  • 1991 BMW 318
235k mis. 5sp.
Idles rough and runs rough till about 2500 rpm then runs just fine unless dips below 2500 rpm again. Am pretty sure it is one cylinder not firing but not sure what to do about it.
Monday, June 18th, 2007 AT 6:12 PM

1 Reply

Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
Pull of the plug wires one at a time until one of them being pulled off makes little or no difference in the running of the engine. When you find the one start with replacing the plug. If there is no spark there however from the plug wire, replace the wires on the vehicle.
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Monday, June 18th, 2007 AT 11:06 PM

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