The car suddenly started to run rough.

Tiny
PAULINDC
  • MEMBER
  • 2005 BUICK LESABRE
  • 50,000 MILES
How can you tell the difference between an ignition coil failure and an ignition control module failure on a GM 3800 engine? The dealer diagnosed a failed coil (there are three on this vehicle) but wanted too much money to fix it. I replaced the coil myself, but that didn't solve the problem. I brought the vehicle to another shop who, knowing that I already replaced the coil, recommended replacing the ignition control module. That took care of the problem. I'd like to know how I might have got the right diagnosis first.

Thanks.
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Saturday, October 29th, 2011 AT 9:11 PM

1 Reply

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Lots of variables so maybe a couple of different opinions are better than 1? But you are faced with the ol if that dont fix it keep tryin brand of mechanics that sells parts! It helps the economy?
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Sunday, October 30th, 2011 AT 3:06 AM

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