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I have an old 89 F-250 with a 351 FI motor. Last Saturday, I went to town to get fuel, as I was getting close to empty. 5 Miles later I was at the 4 way stop in town. As I went through the stop, the truck chugged a little bit, nothing serious. I thought perhaps I got a shot of air in the fuel line. Pulled into the gas station with no further problems.
Fueled up and as I pulled out of the gas station, the truck chugged and died. Started right back up, and as I pulled to the 4 way stop, it died again. Going through town, it chugged a couple of times, but didn't die.
As I got out of town, it ran fine. I dismissed it as it had just gotton air in the fuel line and purged it out by the time I left town.
The next morning I went to start the truck, and all it would do is roll over. IF I held the gas peddel clear to the floor it would start, run terrible missing and puking, and HUGE clouds of white smoke trialed behind the truck and some came from under the hood. Under the hood smoke was blow by on the manifold gaskets.
Well, my first thought was the module under the distributor. Replaced it, and no difference. The I replaced the coil, no difference. Then I replaced the ECM, no difference.
I am STUMPED. I am not a pro mechanics by any means. I appears to be pumping too much fuel, or not getting spark to the back two cylinders on both sides of the motor.You can see the unburned gas leaking out of the manifold gaskets on each side.
I checked the catalatic converters too, to be sure they were not plugged. They are good to go. I don't have a gauge to check fuel rail pressures, so I don't know about where the pressure is.
PLEASE help me. Can't afford to have it towed to a mechanic and it is a old truck with no real value (IE: rusted out old truck. Used on the farm and to gather wood. )
check your ignition wires and also check your compression in all 8 cylinders. If your saying its getting too much fuel its possible to be your fuel pressure regulator, coolant temp sensor, map sensor(if its speed density otherwise check your mass air flow meter) or even an oxygen sensor. see what you find with that and good luck!
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