Well, I really need some help here. I have a 75 Bronco with a 1990 Mustang Donor Motor. I went to start it in the driveway last sunday after it setting for only one day and she cranks over good but has no fire. I first checked my electric fuel pump and made sure I had pressure to the manifold. Then I check the coil, a Mallary and ohm it out to Mallary Specs. Everything checked out good. That lead me to the Ignition Modual, after having it check at Autozone, it showed to be good too.
So, I'm getting power to the coil (12V ) but when I crank it over, I'm not getting any spark to the distributer.
Is it possible for the key ignition to be bad?
Is it possible my computer has taken a dump on me?
What else could it be?
Just because you had the ignition module checked out outside of the car doesn't mean anything. Have you checked the wiring going to the ignition module that is in the truck to insure that it is working properly?
It is also possible that the distributor pickup that gives the signal to the ignition module is bad.
As far as the ignition switch and ECU being bad, it is possible. It doesn't sound like you've done much troubleshooting yet though and are kind of jumping to the conclusion that one of the two of them are bad. I'd be looking more closely at the other wiring and distributor pickup to determine that they are good first. After all, this is a swapped in motor. It is very possible that someone didn't do a very good job with the wiring or something else related to the swap causing this.
The 32 year old ignition switch could be bad it's easy to check. Since you can turn the key on and the fuel pump turns on you have power to the ecu so the only way it could be the ignition switch is the crank and run power not getting power in the crank position. To check it turn the key to the on position, hear the fuel pump then jump the solenoid, if it starts it's something to do with the ignition switch, if not look elsewhere.
I had the problem with a truck some years ago and it was a PITA to figure out.
I would say it's maybe a 10% chance it's the key switch, I would say check the actual fuel pressure then, TFI, pickup the are the obvious. The wiring of a FI motor into an EB is fairly straight forward but if done by a hack it can lead to many issues so that could be a problem.
Well Gang,.....It was the computer. It took a while to narrow down, but we slipped in a different one and she fired right up.
Thank you King of Pain,...BrianW.
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