Hi everyone

before year ago , I replaced the Ignition control module (ICM) and the 3 coils on it (all the parts was original from AC-delco) . And I kept the old one to reserve . I knew that the weak point of the GM 3800 is the ICM and those coils .

after 10 months the ICM (the new one) goes bad , I replaced it with the old one that I kept and it start working fine until yesterday ! Again , the ICM goes bad . Now , I bought a new one (AC-delco) and put it and it works fine .

why the ICM goes bad so quickly ? It is not a cheap part ...
I did something wrong ?

please help me

A bad coil can blow them. Even though the coil still works.

Thank you .
just to be sure , toady I switched between the old and the new coils .

someone told me to spread a dialectric grease under the ICM . It'* true ? Maybe that my problem ?

Thank you

Yes to the dielectric. Clean where it makes contact with the block then add the grease. That'* where the module gets it ground. Also, make sure the ground to the engine block is clean and tight.