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I have a 2000 Buick lesabre I have a miss I change the plugs…

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I have a 2000 Buick...
I have a 2000 Buick lesabre I have a miss I change the plugs I'm not getting fire on number 3&6 core pack I step the core packs around then I got fire so it's not the core packs so would the crank sensor do that or should I be looking at a different sensor . Thanks
Submitted: 2 years ago.Category: Buick
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Answered in 4 hours by:
2/23/2016
Buick Mechanic: Joe Prestia,
 replied 2 years ago
Joe Prestia
Category: Buick
Satisfied Customers: 31
Experience: Lead Automotive Tech at Belle Tire
Verified

You swapped the coil packs and it runs on all cylinders now or still misses and your miss didn't move?

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Customer reply replied 2 years ago
When I swap the core packs The one I thought was bad was good but I still got the miss from 3 & 6 no matter what core pack I use .
Customer reply replied 2 years ago
Miss didn't move
Buick Mechanic: Joe Prestia,
 replied 2 years ago

Most likely this is going to be caused by a bad ICM. That's the thin computer that the coils mount to. It could also be caused by a bad crank sensor signal. The only way to rule this out is to test the crank sensor with an oscilloscope. For what it's worth it looks like the ICM is at fault roughly 80 percent of the time with this symptom. Good luck! Hope this is helpful!

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