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Great White · 08-13-2020

I don't think the engineers originally intended for these coil packs to live in the environment that they do. There's a lot of heat under the plenum, and very little airflow. When I pulled my plenum for a bad injector and vacuum leak, I found that 3 of the 4 coils had cracked plastic housings in multiple places.

I've dealt with several other GM vehicles that used the same DIS coils and they are usually in a much better (cooler) location. However, their faiure rate is pretty regular. I doubt many older GM cars have their original DIS coil packs. Almost every older GM car I see at the junk yard with DIS has at least one new coil on it.

08-13-2020	#11
Great White Join Date: Mar 2018 Location: Misery Posts: 91	Re: lost spark in cylinder 1 I don't think the engineers originally intended for these coil packs to live in the environment that they do. There's a lot of heat under the plenum, and very little airflow. When I pulled my plenum for a bad injector and vacuum leak, I found that 3 of the 4 coils had cracked plastic housings in multiple places. I've dealt with several other GM vehicles that used the same DIS coils and they are usually in a much better (cooler) location. However, their faiure rate is pretty regular. I doubt many older GM cars have their original DIS coil packs. Almost every older GM car I see at the junk yard with DIS has at least one new coil on it.