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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 07-19-2014
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Ignition problem

So here's a good question for ya'll. Specs are in my sig. Good pcm, good icm, good coil, continuity on all wires, 12v where it should be. New plugs/wires. CKP is new. No spark... ideas? I can't for the life of me figure out what's wrong with this thing.

I've checked everything, cleaned my grounds, cleaned my connections, and it just won't spark. I have fuel pressure, and it's pushing fuel/air out the exhaust...

How can I check the CKP is sending a signal? I tried to probe at the ICM and crank, with my meter on voltage and the negative on the battery ground. Nothing but a .5-1.5v background current from KOEO. I verified the CKP was good by checking against 2 brand new ones from napa, all three read the same resistance.

Seems like Ford Ranger Forum and The Ranger Station can't help me on this one, so maybe you guys can?
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Old 07-19-2014
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have you tried the camshaft position sensor
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Old 07-19-2014
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No CPS on a 94 federal emissions. Probably should've mentioned it was federal before hand.
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Old 07-20-2014
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Good ICM, do you mean EDIS module?

The '94 4.0l will use an EDIS-6 module for spark control, CKP sensor wires run to this module, and the coil pack Ground wires come from this module.

On my '94 the EDIS module is located near the battery but on the Front side of the rad support, you can see it by looking up under the bumper, about a 4" square black box with a large wire connector.

The EDIS is the spark system brain, it can run the spark without the computer.

The CKP sensor starts the ball rolling, without an initial pulse from the CKP to the EDIS there is no spark started, and the EDIS sends this pulse to the PCM(computer) which starts the fuel injection system.

Just as a general test to see if coil pack is being grounded by EDIS module, hook up a test light to "+" on battery and to one of the 3 ground wires on the coil pack, unplug the wire from coil pack, crank engine, test light should flash on and off as EDIS grounds and cuts ground to coil.
If no flashing then either EDIS is the issue or CKP.......or wiring between CKP, EDIS or coil

CKP---------EDIS-----------coil

Thats the FOUR parts for spark, fourth being the wiring, lol

Last edited by RonD; 07-20-2014 at 12:20 PM.
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