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The top coil pack does not fire, the other 2 coil packs do fire

Tiny
DMAASSEN30
  • MEMBER
  • 2001 PONTIAC BONNEVILLE
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Tha car has a firing miss. One of the coil packs is not firing. Replacsd the one that is not firing and the new one does not fire. We switched the coil packs around and the same thing happens. The one coil pack does not fire and the oher 2 do fire. Could the problem be the ignition control module that the coil packs hook to or could it be the crank sensor?
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Sunday, December 21st, 2014 AT 2:27 PM

2 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Did you try to see if it was the wires or the plugs on one of those two cylinders thats bad?
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Sunday, December 21st, 2014 AT 2:57 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Also check that the injectors are spraying or pulsing well. Do a compression check to check to see if you have bad compression on those cylinders.
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Sunday, December 21st, 2014 AT 2:58 PM

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