Engine cranks but no spark from coil packs?

Tiny
JOHNLIEN58
  • MEMBER
  • 2004 BUICK LESABRE LIMITED
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 205,000 MILES
It all started the other day, I keep on going through ICM once a year, this time as I looked at the connector to the ICM it was burned at the last pin on the far left I noticed this last year so this time I decided to replace cam sensor and crank sensor also replaced a new ICM wire harness I had to remove the harmonic balancer to do this but inspected it and it looked fine after all the new parts where installed plugged in all the connections made sure everything was correctly secured and was confident all was good, tried to start the engine it cranks with no problem but will not start, checked for spark at the coils I have none so I'm at a loss as to what I should be looking for at this point.
Friday, November 3rd, 2023 AT 7:29 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The reason the ICM goes out is because the ignition coils are bad, I would replace the ICM again and all three coils and get new wires and spark plugs. Check out the images (below). Please let us know how it goes.
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Friday, November 3rd, 2023 AT 10:50 AM

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