Tip: Intermittent ignition problem.
Problem: Won't start (no spark). Very intermittent.
Shortcut: Check voltage across ignition coil with ignition switch in "ON" position. If voltage is not 5 to 6 VDC, check ground wire connector to Ignition Control Module. If connector is ok (clean and tight) then ICM is faulty. ICM is located beneath the coolant reservoir on driver side of engine compartment. It is easily replaced after removing coolant reservoir.
Hope this helps someone out there. About drove me nuts trying to chase it down because it was so intermittent.
NellyBelle
1988 YJ
4.2 liter
Problem: Won't start (no spark). Very intermittent.
Shortcut: Check voltage across ignition coil with ignition switch in "ON" position. If voltage is not 5 to 6 VDC, check ground wire connector to Ignition Control Module. If connector is ok (clean and tight) then ICM is faulty. ICM is located beneath the coolant reservoir on driver side of engine compartment. It is easily replaced after removing coolant reservoir.
Hope this helps someone out there. About drove me nuts trying to chase it down because it was so intermittent.
NellyBelle
1988 YJ
4.2 liter
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