1989 BMW 525i Plugs

Tiny
SSERWANGA
  • MEMBER
  • 1989 BMW 525I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 92,000 MILES
BMW E34 (5Series) 1989 Model


I keep killing one plug in the engine despite replacing them with new bosch plugs long range recommended for this model. The car will run ok then one plug dies.

What could the problem be?
Wednesday, January 13th, 2010 AT 7:52 AM

1 Reply

Tiny
ZUE
  • MEMBER
  • 76 POSTS
Is the plug center electrode still intact or is it consumed? If you are burning up the center electrode then your cylinder heat is geting too hot for the plug to survive and can be caused by overlean condition. Is your cars Engine or Service light coming on? If so what is the code? I suspect a faulty injector causing a lean condition in that one cylinder.
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Wednesday, January 13th, 2010 AT 8:18 AM

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