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  1. #1

    Default ignition troubleshooting

    Hello, I'm a new member with a basic question. 98 sierra vortec v-6 won't start. Sat for a few days in pouring rain without being run, cranks fine but won't fire. Was running fine when I parked it. Checked cap, rotor, plug wires all are not very old, looked good except found some corrosion on coil wire terminals. Cleaned up, still nothing. Tested for spark at plug with in-line spark tester, very weak spark. Checked for spark at plug in open air with screwdriver, also weak spark. Tested coil with ohm meter as instructed in Chilton book, checks ok. Fuses for Eng 1 and ECM 1 ok. What is the module on the side of the coil bracket? It looks like it may serve as a condenser would in an old-style system. Anyone have any suggestions?

  2. #2


    i believe that thing on the side is your icm (ignition control module)

  3. #3

    Default thanks

    Thanks. The parts store guy insists I should try cap and rotor first but they look brand new and show infinite resistance between cap terminals. I think I will find a module I can try from a buddy's truck to rule that out. I hate throwing $$$ at the problem to find the answer, especially since I'm laid off and $ are scarce.

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