2.9l 88 bronco 2 no spark 12 v at spout connector?

190

Asked by Jack Sep 23, 2017 at 01:47 PM about the 1988 Ford Bronco II Eddie Bauer 4WD

Question type: Maintenance & Repair

88 bronco 2 just suddenly lost spark, disconnect
spout and i get spark. Replaced everything in
ignition side. Except wiring. Please help??

8 Answers

254,995

Usually when this happens the ECM is toast, but I did find one time that there was a wiring problem right at the ECM connector, it would intermittently feed battery voltage back through the system, and that would fry the ignition module. About two months after that was repaired it came back on a tow truck, this time the ECM was gone I took it apart and the circuit board showed signs of overheating on the same wiring connections that I had fixed before, I rechecked my repair and it was still good, got another ECM and it fired right up. Customer came back 3 months later to have the rig gone over for hunting season and said its was running better ever, even got better MPG. So check the harness wiring and if that looks good then most likely the ECM needs replacing.

1 people found this helpful.
190

Thanks for thebquick response. I replaced the ecm about a year ago, but just found out the gloor boars all around the ecm were soaked when it died.. Was running fantastic till the rain.

190

One last question, that 12 volts goes down to .6 v at the spout when i reconnect the tfi module. Does that matter?

2 people found this helpful.
254,995

Disconnect the ECM and see if the voltage goes away, if it does then you have an ECM problem, most like a wet short, if it doesn't then you have a wiring problem, that wire is normal a signal wire so i use a lab scope on it not a voltmeter. See diagram

1 people found this helpful.
190

Thanks alot! I pulled the ECM and took the case off, it was burnt up on one of the small circuit boards.. Guess ill start shopping. Thanks again! Btw until i get the leak figured out could i wrap the new one in plastic or ductape to seal it?

254,995

The case is the heat sink for the ECM so it really needs some air flow but not a lot, if you could figure out a way to suspend it in open air would be the best, maybe a duct tape cradle might work.

1 people found this helpful.

Check the EEC ground at the negative battery post, or body ground near the starter relay. It is important to have a good ground on pin 20,40, and 60 at the pcm.

60

Most likely a bad TFI module, located on the back of the distributor. If and when it dies you get no spark and of course a no start as a result. They get hot and fail pretty frequently it seems. You can remote mount it if you wish and that seems to keep them from dying....https://www.therangerstation.com/how-to/ignition-charging-computers/remote- mounted-tfi-ignition-module/

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