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I have a 1985 F250 with the 300 inline 6. I replaced the head gasket and intake and exhaust gaskets and also the carb to intake gasket. Now the truck will run for a little while but as soon as you cut it off it won't restart. I replaced the fuel pump but still hasn't helped. Any theories?
Yes only when it's hot. it starts great and runs great when cold. It runs good and then starts getting sluggish and will stall after a while. It has a throttle body carb just replaced the fuel filter, fuel pump and starter.
Yes only when it's hot. it starts great and runs great when cold. It runs good and then starts getting sluggish and will stall after a while. It has a throttle body carb just replaced the fuel filter, fuel pump and starter.
On a Duraspark II 4.9-6, we would typically belch out the response, "Ignition Module," as your symptoms are indicative of a bad ignition module (starts when cold, won't start after it's warmed up and the module is hot). I don't know if the same symptoms carry over to the computer controlled modules, but none the less...
You should have a computer controlled carburetor.
Take photos of the carburetor, of the distributor, and confirm that this has the computer behind the ashtray in-cab. Post the photo's here (so we can verify that you still have feedback equipment and not a partial Duraspark II swap).
Then...
Pull the codes from the computer (OBD 1) and tell us what codes you get.
I think it was 1992 when Ford relocated that component to the driver's side fender up by the firewall.
It's mounted on a heat sink up there, too.
No idea what it would take to implement that in an older model....
Not sure what year it started, but adding it to an older truck requires the heatsink assembly, and the wiring harness extension. The wiring plugs into the current plug at the dist that normally plugs onto the TFI, as well as another "leg" that plugs into the dist in place of the TFI, and then goes to the relocated TFI.
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1980 F-150 300 I6, C6 & 9" rearend. The workhorse. 300K+
1974 F100 Ranger XLT 390, C6 3.25 axle. Dad bought it new, drove it over 500K. Now that he can no longer drive it came to me. Value: Priceless.
1983 Mazda RX7 1.1L Rotary. The show/autocross/toy. 231K
1995 Mazda B2300 (undercover Ford)
I think you probably could. You'd have to make a cable that plugged into the dizzy, and sealed the opening. Then mount the TFI module away from the heat. In fact, I think if you google it I read somewhere that had a writeup on doing just that. I know I plan to do that with mine, somewhere down on my TO DO list. If you check around the junkyards you should be able to find one mounted on the heat sink. They used them at least up till 95 because that's what my RV is.
One great source for finding this "relocation kit" is ranger/bronco II/areostar with a 2.9L V6.
IIRC, this engine was the first one to get the kit, as the dist is at the rear, where there is more heat and less airflow.
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1980 F-150 300 I6, C6 & 9" rearend. The workhorse. 300K+
1974 F100 Ranger XLT 390, C6 3.25 axle. Dad bought it new, drove it over 500K. Now that he can no longer drive it came to me. Value: Priceless.
1983 Mazda RX7 1.1L Rotary. The show/autocross/toy. 231K
1995 Mazda B2300 (undercover Ford)
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