1991 F250 w/ 5.8 Windsor No Start Issue
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4wd Low
Joined: May 2020
Posts: 11
Likes: 2
From: MT
1991 F250 w/ 5.8 Windsor No Start Issue
I started the truck yesterday morning, it lit right up, idled for a minuted, then the tach jumped and it died like someone turned off the key.
I put a new ignition coil in it after testing the old one and finding no resistance between the tach lead and the bat lead. Brand new set of plug wires, probably only 7 months old.
Still no start, cranks fine but wont catch, i didn't have much time to look into much else the past two days, going to look some more tomorrow.
Any pointers on trouble spots would be appreciated.
I put a new ignition coil in it after testing the old one and finding no resistance between the tach lead and the bat lead. Brand new set of plug wires, probably only 7 months old.
Still no start, cranks fine but wont catch, i didn't have much time to look into much else the past two days, going to look some more tomorrow.
Any pointers on trouble spots would be appreciated.
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
A very good chance that the ignition module on the side of the distributor went dead. You need a special tool to remove and reinstall the ignition module, a skinny nose socket of sorts.
Make sure to apply the heat sink grease to the back side of the ignition module when installing.
Make sure to apply the heat sink grease to the back side of the ignition module when installing.
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4wd Low
Joined: May 2020
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From: MT
Is there a easy way to test the ICM before removing it?
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
There is a procedure explained in the Haynes repair manual but I have never used it. I have a fair amount of personal experience with Fords of this vintage with the ICM on the side of the distributor, mostly Taurus cars. From what you explain I am fairly confident you will have a failed ICM.
If I have power up to the coil through one of the small wires that hook onto the coil, and no spark while cranking the engine: either the coil, the ICM or the PIP in the distributor. Usually when the PIP goes bad it will revive after sitting for a while. When the ICM goes dead it is dead for good in my experience.
The bottom line, if I was in your shoes I would just remove the ICM and replace it or try to get it tested at the auto parts store.
If I have power up to the coil through one of the small wires that hook onto the coil, and no spark while cranking the engine: either the coil, the ICM or the PIP in the distributor. Usually when the PIP goes bad it will revive after sitting for a while. When the ICM goes dead it is dead for good in my experience.
The bottom line, if I was in your shoes I would just remove the ICM and replace it or try to get it tested at the auto parts store.
Lead Driver
Joined: Jan 2019
Posts: 5,076
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From: N.W. Alabama
Thread Starter
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4wd Low
Joined: May 2020
Posts: 11
Likes: 2
From: MT
I have tested the ICM and PIP and both are good, coil is getting signal and 12v, still no spark ie. no start. Could it be a broken ground somewhere on the engine?
-Already disconnected the condenser on the coil to see if it was shorting the system, no change.
-Already tried for spark without computer connected, computer is good.
-Tested Coil to Dizzy Wire, has continuity, and is within spec.
I'm really stumped at this point, this is my main rig, its really getting under my skin that i cant find the issue.
-Already disconnected the condenser on the coil to see if it was shorting the system, no change.
-Already tried for spark without computer connected, computer is good.
-Tested Coil to Dizzy Wire, has continuity, and is within spec.
I'm really stumped at this point, this is my main rig, its really getting under my skin that i cant find the issue.
Last edited by DogfightDixon; Mar 17, 2021 at 08:14 PM. Reason: Misspelling
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4wd Low
Joined: May 2020
Posts: 11
Likes: 2
From: MT
FIXED!
Finally gave in took the ICM to NAPA and had it tested: Bad
Put a new one in and she lit like a match to gasoline!
appreciate the help and pointers!
________________________________________
Old Blue - 1991 F-250 XLT Lariat, 5.8w, 4x4, E40D
Finally gave in took the ICM to NAPA and had it tested: Bad
Put a new one in and she lit like a match to gasoline!
appreciate the help and pointers!
________________________________________
Old Blue - 1991 F-250 XLT Lariat, 5.8w, 4x4, E40D
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