94 F250 No power Engine shake - Ford Powerstroke Diesel Forum
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Old 12-05-2012, 10:34 AM
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94 F250 No power Engine shake

Hey guys, My 1st diesel and I'm really debating on selling it or keeping it because I can't seem to figure out this problem. So, its a 94.5 F250 7.3 turbo diesel. 5 speed. I think the only things done to it are a 6 position chip and a 6 inch stack. I had it checked out by an old guy used to be a mechanic, he said as soon as he started it, that it had a "miss", and i need injectors. Its got 233xxx I dont know if they have ever been changed.
The Problem: -Sounds like has a miss at idle
- doesn't seem to have a lot of power while driving
- front end/motor shakes when i try to step down on it "give it gas"
- hard start when its cold
- is very sluggish in high gear, 4th or 5th
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Old 12-05-2012, 11:00 AM
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Your injectors could be getting tired at that mileage. Does it use any oil? The "miss" at idle could be from an injector not firing due to a bad solenoid or a loose injector poppet screw (the poppet screw on my 94 #7 injector liked to come loose and cause this). The dualmass flywheel is also notorious for causing what seems like a miss, so that could also be a problem. You may want to remove the valvecovers and run the engine with them off to see if the amount of oil coming out the injector oil spouts is consistent or if there happens to be oil leaking out around the base of the injector at the head. Cheers!
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Old 12-05-2012, 11:14 AM
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Quote:
Originally Posted by Patrick Feeley View Post
Your injectors could be getting tired at that mileage. Does it use any oil? The "miss" at idle could be from an injector not firing due to a bad solenoid or a loose injector poppet screw (the poppet screw on my 94 #7 injector liked to come loose and cause this). The dualmass flywheel is also notorious for causing what seems like a miss, so that could also be a problem. You may want to remove the valvecovers and run the engine with them off to see if the amount of oil coming out the injector oil spouts is consistent or if there happens to be oil leaking out around the base of the injector at the head. Cheers!
It has an oil leak so I'm not sure if it uses oil. How would I know if a solenoid is bad? I was told you could hook a computer up to it? I just don't want to go replacing the injectors right now if not needed then I still have the problem.
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Old 12-05-2012, 07:33 PM
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If you have the correct scanner software and interface (and your 94 PCM has been reflashed to a later code to activate the diagnostic port under the dash) you can hook up to it and monitor various parameters to see what's really going on. You can check the injector solenoids doing resistance checks at the 4 valvecover connectors. On each connector there are 5 pins. Pins 1 and 5 are for the glowplugs. Pin 3 is the common for two injectors and Pins 2 and 4 are the individual wires for the injectors. If you ohm from Pin 2 to Pin 3 and from Pin 4 to Pin 3, you should see around 2-3 ohms on each injector. If one is open circuit, the solenoid would be bad. The poppet scew is under the solenoid which is held on by 4 torx screws. Cheers!
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