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Discussion Starter · #1 ·
Help \'86 Bronco ignition problem???

I rebuilt my carb 1 year ago and the truck ran fine for 6 months. Now for the last 6-months the truck will shut off while driving, it doesn't stutter or hesitate, it just shuts off like you turn the key off. When you try to re-start it it acts like there is an electrical power drain, lights dim and the starter turns over slowly. It will start but only for 1 second and immediately shut off again. It will do this 5 or 6 times before it will finally stay running. Eventually, as you are driving, this sequence will be repeated. I started trouble shooting at the carb, it is pumping fuel even when the problem occurs so I ruled carb problems out. Last night I replaced the positive battery cable andI replaced the ignition coil. I thought the coil might be cutting out but this did not fix the problem. I am now starting to wonder if I have a bad wire somewhere. The engine and wire harness are original from 1986. Something is occasionally draining the electrical power. Bad ground? Any ideas out there????
 
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Discussion Starter · #2 ·
Re: Help \'86 Bronco ignition problem???

You mite look at the brain mine did that and the brain was bad only about 25.00 not bad . good luck Bill
 

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Re: Help \'86 Bronco ignition problem???

Sure sounds like that or one heck of a dead short or wicked grounding interuption.

Malcolm
 

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Re: Help \'86 Bronco ignition problem???

It's gotta be either the battery ground wire (check both ends and where it grounds the frame), the ignition ground, the computer ground (if it has one), the ignition switch, or the wiring between them (in that order of probability).

Steve
83 Custom w/95 4.9L EFI, 78 NP435, 83 NP208, 83 D44IFS 3.07, 87 Ford 8.8ABS 3.08, Michelin LTX AT 31x10.50R15
 
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Discussion Starter · #5 ·
Re: Help \'86 Bronco ignition problem???

Well, I replaced the brain box yesterday morning and drove the truck around for a few hours. The problem never occurred. Could it be fixed? It sure looks that way and I couldn't be happier. I have been putting this problem off since hunting season started and you can believe how excited I am to fix this problem. Thanks guys for all your help. Actually, with replacing the coil and brain box, this truck is running as good as ever since I have had it. It even passed the emissions test yesterday, which around the St. Louis area is tough to do with an old truck. Anyway, thanks again!
 

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Re: Help \'86 Bronco ignition problem???

Umm, what's a brain? My truck must not have one, because if it did it would be smart enough to steer the other way when I turn towards small ponds.

It's a Jeep thing? My Bronco thing will run over your little Jeep thing.

Muddybronco
 
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