944Newb

Well let's see if any of you guys can help me out here. I have no spark on my car, and no power going to the coil. Which would lead me to believe that the ignition module is faulty or perhaps a DME relay..? But if the DME relay went out I don't think id be getting any fuel either if I read right. I did my searching and found only info about ignition modules on the S and S2 models.

Where is the ignition module located and does anyone know resistance values to help me diagnose? I have checked Clark's garage and pelican as well.

StoogeMoe

The DME relay doesn't control spark. If you're getting no power to the coil, then it's most likely the ignition switch.

944Newb

Is there even an ignition module in the early model? I'll look into the switch hopefully I can find wiring schematics to test first

944Newb

The 9 pin connector above the brake booster has power at the thick green wire (which I believe is the coil wire) with the key on. Also cleaned some corrosion and fixed a wire at the 2-pin connector an still no power to coil.

My reference sensor connector is all cracked but has been for a while, I have the pins in as far as I can get them and even moving them around while cranking doesn't help.

I read that the DME relay has solved no spark problems but as said above it doesn't?

Arrrgh!

kinda5150

do you have power at the green wire at the coil? those are known to be a weak spot--tend to break/chafe.

StoogeMoe

No, no! The green wire is the output from the DME to fire the coil. The black wire is the power. You should have 12V at the black wire. See Clark's Garage Here for the procedure to test the coil. You may want to go through the other tests for a no start condition.

944Newb

Well with my meter I have power at the black wire (+) at the coil only when I ground to something other than the neg side of the coil.

I tried jumping the negative side of the coil and nothing. Also tested the coil by grounding a spark plug while it's in the coil wire and theirs no spark no matter how I set it up. Also tried an over the shelf coil lying around in the garage and still nothing.

I'm going to order reference sensors because it needs done regardless

rgs944

Is'nt the speed sensors the cause of 99% of no sparks on a 944.

StoogeMoe

The green wire is not the negative side of the coil. It is the trigger. It gets grounded by the DME to generate a spark. Did you follow Clark's procedure for testing the coil?

I had a problem last year where the black wire would measure 12V but would not generate a spark when grounding the other side of the coil. It turned out that the black wire was broken somewhere and was just barely making contact. It wasn't strong enough to generate a spark. I ran a jumper wire from the black wire directly to the + battery and it was fine. I doubt that's your problem since that is such a whacky failure.

After verifying that your coil is working I would be looking at your reference connectors since you mentioned that they were all damaged.

xsboost90

the DME relay can also fail on just one contact inside, there are two, one for spark and one for fuel.