LT5 Coil Testing

[95ZR1#418]

Hi All-
I'm not having any luck finding the actual procedure for testing the coil packs in the GM service manual. There are many references to do it using GM Spark Tester J26792/BT-7220-1, but that is all. Do you have to have this tool to do it? Can anyone describe how to check them ?
TIA Bob

 

[95ZR1#418]

Thanks for your info. As you say, I'm sure the computer would set a code, therefore it should be O.K.- no codes have set & car runs great.

It's a backfire problem and the manual does list coils as something to check , although I'm quite sure it is a leaky injector problem.

Thanks, that helps .