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post #1 of (permalink) Old 11-04-1999, 12:02 AM
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Bronco Dies Spontaneously

I own an 88 Bronco, 351W. It dies on me at various times. I could be driving down the road, everything seems fine, then it dies and I have to try my hardest to get it on the side of the road before everyting locks up, it's scary sometimes. Other times I will be in traffic and it will dies and is a pain to start. Sometimes it takes 10-20 turns of the key before it finally gets going again. And some of those times that I do crank it, it sounds like something from the engine, possibly the starter but I don't think so, just keeps whirling like a humming sound?! It's crazy! Is there anyone out there that can help me figure out what these problems are? Thanks in advance.

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post #2 of (permalink) Old 11-04-1999, 06:33 AM
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Re: Bronco Dies Spontaneously

>>>This is just a guess, but, it may be the main fuel pump. This is located on the inside of the frame rail on the driver side beside the tranny. I have had problems with relays that would cause the pump to continue running when the key was off. This inturn cause flooding problems. It does make a whirring noise when running. Maybe you have a bad relay or just the pump. Hope this is useful. Laters.

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post #3 of (permalink) Old 11-04-1999, 11:43 AM
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Re: Bronco Dies Spontaneously

I may be wrong but I don't think a constantly running fuel pump would cause flooding. Unused gas is returned to the tank via the fuel return line. The injectors control the amount of gas that would go into the cylinders. A bad injector could cause flooding if it was leaking...

This really sounds like the the fuel pump though (there's one in the tank too?). I had this same problem on my Mustang. Eventually the pump died. (165k miles on the stock pump; for reference) If it actually is a fuel delivery problem, you may want to check the fuel pressure too (while running).

Does it make the sound only while you're cranking? Or only with the key in the "run" position? Or always? I would try to determine what was making the sound and work from there. Could be an electrical problem.


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post #4 of (permalink) Old 11-04-1999, 12:18 PM
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Re: Bronco Dies Spontaneously

I've heard there are some components in the distributor that can fail intermittently when they get hot. Causes stalling, then restarts ok when it cools down. I saved a message from another Bronco user, I'll try to dig it up for you.

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post #5 of (permalink) Old 11-05-1999, 02:11 PM
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Re: Bronco Dies Spontaneously

On my 82 I had problem with it intermittantly shutting down on me. It turned out to be some bad wires between the ignition box on the left fender well and the distributor/coil. Take a look when it dies at the tach. If it immediately drops to zero then you have an ignition problem. If it still shows some RPM as the engine winds down then it might be the fuel problems discussed above. The tach reads the coil sending out a spark. So if it is reading something and the engine is not running the problem is either down stream of the coil or a fuel problem. The ignition switch has also been known to go bad too. This can be noted by all of your accessories shutting down when the engine dies. The run contact no longer make good contact.

[img]/wwwthreads_images/icons/cool.gif[/img] MG48 - 88 Bronco
post #6 of (permalink) Old 11-08-1999, 10:54 AM
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Re: Bronco Dies Spontaneously

Similar problem on a F-150 I had...It was an ignition module that went bad on mine. It would totally cut out and die, then would start up after it sat a while.
Be careful and try wiggling various ignition components with the engine running to see if you can get it to cut out and die.
Good Luck

post #7 of (permalink) Old 05-06-2002, 09:42 PM
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Re: Bronco Dies Spontaneously

Hey I'm new here and just started at the recommendation of a friend...anyways
I own an 88 Bronco, 302 EFI...it was doing the same exact thing to me. It feels hesitant at stop lights and sometimes stalls, or will just stall wherever, leaving you for 20 to 30 minutes until it decides to start again. I was also told that it was the fuel injection. However, when the local friendly mechanic overheard me at the store, he recommended replacing the Ignition Control Module on the distributor. It hasn't given me any trouble since (3000 miles ago)
post #8 of (permalink) Old 05-07-2002, 02:56 AM
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Re: Bronco Dies Spontaneously

wow morgan, you brought a seriously old post back from the dead! [img]images/icons/shocked.gif[/img]
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post #9 of (permalink) Old 05-07-2002, 12:52 PM
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Re: Bronco Dies Spontaneously

i had the same problem, i thought it was due to overheating, but the case was the fuel pump just stop pumping... in my 91 the fuel pump is located in the tank
post #10 of (permalink) Old 05-07-2002, 05:59 PM
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Re: Bronco Dies Spontaneously

yeah...got a little anxious with the replies...but it's a good one. For $6, I'd replace the ICM before I even came close to my fuel pump, it's a good bet.
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