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Unread 04-12-2009   #1 (permalink)
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Default 1987 Mustang No spark Question

My car is an 87 carbed 302 with a duraspark setup

Cranked it today letting it warm up...It was running very smooth (went to the store and everything) then it just shut off like I had turned the key off and will not restart. Key on I have 12v at both positive and negative coil terminals. Swapped coils to one I had laying around, still cranks but will not fire even with a different coil wire to distributor. Coil is an MSD blaster but everything else is just a regular duraspark setup...I took out a spark plugand connected a plug wire to it...grounded to engine and it isnt sparking when I crank it...I did this with about 5 of them.

Im assuming it doesnt have spark because when I crank it, it doesnt even try to start if you know what I mean. I also have good fuel pressure to carb if that matters

any ideas?

thanks

EDIT...looked on the underside of the distributor cap and it looks a little corroded, but would it cause loss of fire simultaneously to all cylinders causing a complete shutoff?
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Unread 04-12-2009   #2 (permalink)
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You might try a new cap and rotor...that looks pretty corroded.
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Unread 04-12-2009   #3 (permalink)
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Quote:
Originally Posted by noble steed View Post
You might try a new cap and rotor...that looks pretty corroded.
The rotor is pretty new, and looks clean...switched to carb around 6 months ago and bought a new distributor and rotor, however I am using the old cap

but yea, it just died like I had turned off the switch...no stumble or anything...and now it doesnt even try to fire, as if I had the wire pulled off the coil. Coil has voltage and wires are new

The cap contacts look very rough but Im wondering how it would cause an engine cutoff when seconds before it was idling very smooth without a misfire or skipping or anything
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Unread 04-12-2009   #4 (permalink)
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go with a plain old autozone replacement or maybe look at something msd?
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Unread 04-13-2009   #5 (permalink)
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replaced distributor cap and still wont fire, oh well I needed a new one anyways

I took a step back and started checking a few other things and found I had a blown 25a fuse in slot #16

car is 87 GT carbed

is that fuse ignition related? all my other accessories worked even with it blown...if so could whatever blew that fuse have eaten my ignition box?

this is the one I have
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Unread 04-13-2009   #6 (permalink)
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Ok lets slow down here a little and think this through......

Are you getting spark from the coil when you crank the motor???? Pull the coil wire off the dizzy and see if your gettin spark from it.... If you are then I would just about bet your pickup in the dizzy went bad but im not for sure just check and see if your gettin fire from the coil and let me know just dont shock your self it wont hurt you literally but it hurts like hell....lol
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Unread 04-13-2009   #7 (permalink)
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Quote:
Originally Posted by fordman777 View Post
Ok lets slow down here a little and think this through......

Are you getting spark from the coil when you crank the motor???? Pull the coil wire off the dizzy and see if your gettin spark from it.... If you are then I would just about bet your pickup in the dizzy went bad but im not for sure just check and see if your gettin fire from the coil and let me know just dont shock your self it wont hurt you literally but it hurts like hell....lol
No spark from coil, however, if I take the coil wire off the dizzy...attach a spark plug to it placed near engine block, and give the coil power directly from the battery, spark will occur
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Unread 04-13-2009   #8 (permalink)
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Then your problem lies inside the dizzy. Either a condenser or hall effect pickup.
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Unread 04-13-2009   #9 (permalink)
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it ended up being a bad duraspark box...I appreciate the help guys
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Unread 04-14-2009   #10 (permalink)
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Quote:
Originally Posted by noble steed View Post
Then your problem lies inside the dizzy. Either a condenser or hall effect pickup.
No thats not correct....if im not mistaking your coil gets fire before your dizzy.....right??????
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Unread 04-15-2009   #11 (permalink)
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Quote:
Originally Posted by fordman777 View Post
No thats not correct....if im not mistaking your coil gets fire before your dizzy.....right??????
Just for reference...

In that generation Ford used a magnetic pickup in the distributor. Little iron vanes pass by poles on a coil of wire, and this changes the magnetic flux in the coil causing it to generate a voltage. It's a very trouble free system.

You can identify that type because it has two wires exiting the little coil inside the distributor and three from the distributor itself. Violet, black, and Orange. Black is the ground (you can follow it by eye to ground, the other two to the coil). The black should have NO continuity to any other wire when the distributor is unplugged.

That voltage triggers the Duraspark module.

You can ohm the pickup with an ohmmeter, or spin the distributor and read the voltage on a low voltage AC voltage scale to see if the pickup is good.

The Duraspark gets hottest when sitting with the key on and the engine stalled. The faster you run it, the cooler it gets. So the way you hurt the module is to sit with the ignition on and the engine stalled. You can also blow it out by jumping voltage to the coil primary. If you are going to do that, unplug the Duraspark.

Tom
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