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91 F150 302 ignition problem

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Old 09-12-2010, 02:37 AM   #1
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Default 91 F150 302 ignition problem

My daughter has a 91 F150 w/302.

It stalled out on her a few weeks ago, and I am having trouble figuring out what is going on.

It will stall out, and you cannot get it to start. wait a few days, and then it will start up, and run for about 5 minutes, and then quit.

We have swapped out the distributer, ignition coil, and computer from a truck that was running, and it still does the same thing. I have also swapped out the iginition switch on the lower end of the column.

The Check engine light has not come on, so I have not pulled any codes.

Any suggestions? Any and all will be appreciated.

Thanks,
Jimmy

P.S. I am new to this site, and there is some great info here. Thanks for sharing.
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Old 09-12-2010, 11:45 AM   #2
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It doesn't matter if the check engine light hasn't come on, there can still be codes. So check for codes and have the ICM tested.
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Old 09-12-2010, 01:34 PM   #3
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Thanks for the info. I will do just that, and let you know what we find.

We did have the ICM (the sensor in the distributor) check, and it was supposedly fine, however, with this intermittent problem, it could be anything.
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Old 09-12-2010, 02:14 PM   #4
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You can use this method to check for codes, and it's free: http://www.f150forum.com/f10/how-ret...es-obdi-10907/
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Old 09-12-2010, 09:09 PM   #5
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Could it be a fuel issue? Vapor Lock?
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Old 09-12-2010, 10:38 PM   #6
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When it stalls check for fuel pressure at the fuel rail at the motor that will give you a idea if it’s fuel related. If it hasn’t been replaced I would replace the fuel filter. If it has fuel check to see if it’s firing at the plugs that will tell you if its ignition related. For me I usually do one thing at a time instead of two or three at a time that way I can see if it helped, hurt or made no difference with the problem. Also as already stated I would run a code scan to see if there were any codes or pending codes
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Old 09-15-2010, 09:53 PM   #7
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Default Pulled trouble codes and replaced the ICM

Okay, I had a few minutes this afternoon, and I replaced the ignition module, and pulled the trouble codes.

If I read the codes right they were: 625, 624, 637, 654, 555, 621. Most of these relate to the transmission. I don't understand this.

I am not getting a spark at the distributor cap. I have replaced the following items off of an identical truck that was hauled off to the junk yard: ignition coil, distributor, ignition module, and computer. The truck that was hauled off was running, just in bad shape (smoked) and body wise.

Today I replaced the ignition module (new) and the ignition switch on the lower steering column (new).

I took a small screwdriver and pushed the bleeder valve on the fuel rail, and gas spit out, so I have fuel pressure.

I am getting no spark at the distributor cap. I am checking this with a screwdriver plugged into the coil wire and held just off the center pin of the cap.

I am totally stumped. I really don't have the money to put it in the shop, but this truck has been down for a month, and my daughter needs it for back and forth to school and after school stuff.

Any help or advice is greatly appreciated.

Thanks,
Jimmy
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Old 09-15-2010, 10:30 PM   #8
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I don't think you read the codes right. You should be checking all those ignition components for power.
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Old 10-08-2010, 01:31 PM   #9
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Update 10-7-2010

I took the truck to a firned of mine that owns a garage. He pulled the codes, and if I remember correctly, they were 637 and 624. He figured out that the coil is only firing once, and then no fire at all.

Any ideas?
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Old 10-08-2010, 01:54 PM   #10
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Quote:
Originally Posted by Just call me Sean View Post
You should be checking all those ignition components for power.
Have you done this?
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