Getting no spark out of the coil

Jason Walls

Asked by Jun 22, 2013 at 04:57 PM about the 1987 Ford F-150 XLT Standard Cab LB

Question type: Maintenance & Repair

have replaced the fuel pump, fuel tank, all electrical modules in distributor on firewall!

3 Answers


Check for power on the positive side of coil, if you don't check ignition fuse, if you do then check for a trigger signal on the negative side of coil while cranking, if you have a trigger signal then the coil is bad, if no trigger signal then you either have a bad ignition module and or a distributor stator that you just replaced or a wiring problem.

8 out of 8 people think this is helpful.
Tracy Hooks

Ignition Module

4 out of 4 people think this is helpful.
Tracy Hooks

Ok, too short and sweet. The ignition coil is directly controlled by the Ignition Module on this vehicle. The ignition module is the most common component to fail and cause a no-spark condition although, ignition coils have been known to fail too. The design of the Module uses a Schmidt Swtich and a Darlington Amplifier. There is no regulation of the dwell time through the module or into the coil so the Primary Ignition side of the ignition systems runs at 99% dwell - things get hot and burn themselves out over time. The best indicator is a car that dies and won't restart for 30 minutes to an hour. There is one other thing - rare but it happens - pull the SPOUT connector (the one you disconnect to set the timing) and see if it sparks. If it does spar with the SPOUT out and then won't spark with the SPOUT in - PCM.

10 out of 10 people think this is helpful.

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