1985 Ford F250 6.9 IDI NA, 4 spd manual. Ive had this truck for a couple months now. I am currently in Wyoming attending wyotech. Myself and the truck are from MN. Please note upon purchase it had a misfire at highway speed, but i replaced the fuel filter and filled with PSD and it cleared up. Back in mn the truck ran fairly well and revved out nice and clean. New beru GP's. Stock exhaust besides 3" cherrybomb glasspack.
Either the truck hates the elevation or the 1000 mile trip took its toll. On the way out here it started to misfire at highway speed and run rough. Replaced fuel filter and it seemed to clear up for about 2 miles then ran badly again. Once here in wyoming i replaced the filter again, but had no effects. The gas mileage dropped from 18 city in mn to 13-15.
I advanced the timing a bit but that didnt help much. Replaced the injectors with NEW delphi BB codes. Seemed to help a small bit. Compression checks out at 400 PSI on every cylinder. There is a bolt with a locknut on the back side of the pump above the outlet lines i messed with and it acted like it did something but nothing substantial. Honestly don't know what that bolt does.
Upon sitting for a day or so, it will start up with minimal blue/white smoke and run fairly well. Still doesn't want to rev out, though. It acts like it hits a limiter past 1/2 throttle and just blows black/white/blue smoke. If it sits more than 10 mins after being ran, on startup it runs very rough and will cloud out the parking lot with blue/white smoke. Back in MN it hardly used any oil. Now it burns a pretty good amount. I run either howes additive or power service diesel additive in the fuel. 2 QUARTS lucas oil additive. Drained the water sep a couple times with no effects. The fuel tank does leak a bit when filled up. The water in fuel light does work, but never comes on when running.
It is tough to go past about 65 without it misfiring badly. It doesn't seem to have much power either.
Does it sound like the pumps going out? Air in fuel lines? Lift pump?
Thanks in advance. if i need to provide any more info just tell me
Either the truck hates the elevation or the 1000 mile trip took its toll. On the way out here it started to misfire at highway speed and run rough. Replaced fuel filter and it seemed to clear up for about 2 miles then ran badly again. Once here in wyoming i replaced the filter again, but had no effects. The gas mileage dropped from 18 city in mn to 13-15.
I advanced the timing a bit but that didnt help much. Replaced the injectors with NEW delphi BB codes. Seemed to help a small bit. Compression checks out at 400 PSI on every cylinder. There is a bolt with a locknut on the back side of the pump above the outlet lines i messed with and it acted like it did something but nothing substantial. Honestly don't know what that bolt does.
Upon sitting for a day or so, it will start up with minimal blue/white smoke and run fairly well. Still doesn't want to rev out, though. It acts like it hits a limiter past 1/2 throttle and just blows black/white/blue smoke. If it sits more than 10 mins after being ran, on startup it runs very rough and will cloud out the parking lot with blue/white smoke. Back in MN it hardly used any oil. Now it burns a pretty good amount. I run either howes additive or power service diesel additive in the fuel. 2 QUARTS lucas oil additive. Drained the water sep a couple times with no effects. The fuel tank does leak a bit when filled up. The water in fuel light does work, but never comes on when running.
It is tough to go past about 65 without it misfiring badly. It doesn't seem to have much power either.
Does it sound like the pumps going out? Air in fuel lines? Lift pump?
Thanks in advance. if i need to provide any more info just tell me
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