Mingwro
Newbie
New to forum...is there an existing thread to troubleshoot no spark to plugs...thanks in advance
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Check for spark at the ignition coil. If no spark there check the ignition control module and pickup coil on distributer. I'm not too familiar with the TBIs, but I helped my brother's C1500 with the same problem.
I narrowed it down to those 2 items. I think I checked with digital voltmeter in AC mode. The pickup coil is part of the distributor. Luckily for him a new distributor came with both of those 2 things already included.
Truck started right up. Just took him longer to set the timing. Had to buy timing light.
I hope this helps.
It's funny how many times it boils down to the ICM on these trucks, glad you found it without throwing too many parts at it. I hope you got a good quality ICM like AC Delco, Delphi, etc.changed ignition control module and fired right up
Another trick is, while the engine is running, spray some water on the coil body (not the wires on top). If the engine stumbles, replace it. I had a Pertronix Flame Thrower fail at about the same time as my ICM - go figure huh? Don't know which came first but as @Schurkey said, probably the coil 1st.If it passes the ohmmeter tests, AND it can fire an HEI-calibrated spark tester, the coil is probably good.