i have a 94 ranger with the 2.3l engine there is no spark at the ignition modual (the front one both on the drivers side) that controls the plugs on the drivers side of the engine. i swapped with the modual for the exhaust side but the problem stays at the same two plus and doesnt move with the modual what can be the source of this problem? ECU? thanks in advance
There isn't any spark at the ignition module. Are you talking about the coil packs? If you swapped the coils and there is still no spark then you need to test the wiring for that coil to the PCM. If the wiring tests good, then replace the PCM.
I thought the drivers side spark plugs were only active in certain circumstances. In other words, they don't fire all the time. I may be wrong, but have you tried putting a timing light on one of the plug wires and watching if it fires at all? It may be normal.
Do you have any codes or CEL/SES light lit on the dash?
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Sounds like normal operation. The drivers side plugs are not supposed to fire at startup. Replacing the PCM will not change the result, the EDIS system is a standalone ignition controller, the PCM does not control spark directly. The computer only controls timing and dwell.
I like tomw's idea to check for spark with a timing light.
If no joy, check the coil packs primary windings for continuity & it's electrical connector for B+ to each coil primary winding at KOEO.
If that checks out, suspect the coilpacks ground wiring for the troubled coil, all the way back to the computer, as it supplys the coilpacks primary ground switching, to operate the coil packs to fire the spark plugs, so if the ground wiring checks out ok, suspect the computers ground switching driver has a problem.
If all that checks out ok, check the end to end resistance of the two troubled plug wires.
They should measure about 1000 ohms/inch of length, 30k ohms max, no matter the length.
More thoughts for consideration, let us know what you find.
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