1984 F250 6.9 Won't Stay Running

njstang87

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Hello everyone and thank you for taking the time to view this thread.

As the title states I have a 84 F250 6.9 with a 4 speed. The truck starts fine with the help of either (I will be replacing the glow plugs once I get this issue resolved). I let the truck warm up and wait for the high idle to kick off. I take off down the road and the truck acts like the key was shut off, rpms drop and it will die. Sometimes I can keep it running if I mash the pedal all the way down then if I have enough momentum while it's still in gear, I'll keep rolling (the rpms stay low around 1000) then like I turned the key back on it hits then comes back to life. It will keep this up over and over. This has been going on for a while and it seems to be getting worse.

I replaced the lift pump because I thought it was failing. New lift pump is on and still having the problem. Before I go throwing new parts at it I would like to get some expertise or input from anyone that had a similar problem.

I have been running a mix of waste oil and diesel. My next step is going to be running a fuel line from a can of staright diesel from to the lift pump and seeing what happens. Does this sound like a problem with the injection pump solenoid?

Any help would be Greatly appreciated!

Thanks in advance.
 

89Laredo

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When it dies does it start right back up?
If not: more fuel system checks
If yes: I'd try hooking the fss straight to the battery and see what happens, might be a bad harness.

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njstang87

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The problem still exists even if I top the tank off. When I try to restart it I have to wait 30-60 seconds then I have to hold the peddle to the floor and crank it for 10-15 seconds then it will fire off. I will take a look at the harness. Thanks for the responses.
 

snicklas

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Where abouts are you in Indiana? There are several members spread throughout the state.......

We even have a rally starting this weekend.......
 
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