Hey all I have a 95 f250 4x4 obs 7.3l that has a ruff idle and a shimmy when it goes into overdrive (45mph) when it gets above 50 or below 40 it seems to run fine . the truck has 315,000 miles on it. I have had it to ford and a diesel shop the best I got from them was to replace the motor in the last yr I have replaced the uvch ,glow plugs and controller. Have just replaced the EBP Sensor. I get 17mpg in town and 20 on the hwy empty just cant believe it would be the engine. Any idea’s ???

 

Have you had any work on the injectors? 300k they are more than likely due if you haven't. Does it smoke at all?

welcome to fte.

 

no I have not and no smoke other then black, when it was in the shop they said the injectors tested fine

 

Could a worn out HPOP cause that? How about bad ICP or MAP?

 

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Have you ever done injector o rings?

You won't get any code for a weak HPOP

 

no I have not is there a way to test for a weak hpop

 

Yea would need a scan tool that can see live data or build a 5000psi gauge setup to hook to the head so you can see what the pressure is doing

 

hmm guess ill be building a gauge had I not spent all the fees to have it checked out I could have bought a good scanner lol will let you know what I find

 

A couple tests to give us an idea if your injector orings are ok.

When is the last time you changed the fuel filter? How did it look?

If you leave it in neutral and free rev it to 3k, does it stumble bad?

 

just changed the fuel filter last week looked like normal will try the rev test this afternoon

ok from about 1300 up smoothness