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1996 7.3 Running Really Rough
I have a 200,000 mile 1996 ford F250 with the PS 7.3. The truck was running perfectly. While driving it a few days ago I noticed an immediate rough running motor, and at idle it was like a gasser missing on one or two pistons. It will barely start. Runs really rough. I drove it for about 2 miles and it did not clear up. It barley starts, runs terrible and can hardly be driven.
To complicate this matter a bit, I have only had the truck for a week. Old owner did supply much information on past repairs and has no idea why it would be running rough. It was running perfectly when I picked it up.
Here is what I know:
Hooked up scanner and there are no codes. It is clear
No check engine light
Fuel pump was replaced about 60K ago
Fuel Filter was replaced about 10K ago and still looks good
Engine oil is clean but was supposed to be changed about 3K ago, looks to clean for a diesel.
Oil pressure appears normal
There is a faint smell of diesel but I cannot see any leaks or fuel sitting on top of the block
CPS was replaced at 150K
After running the truck, although I dont do it for long with it running so rough, there is a very faint air hissing noise near the top of the motor. Not sure exactly where it is coming from.
The truck as 2 fuel tanks. I did switch to the front tank and ran fuel through it over the last few days. It has well over 50% left in the tank. Was running on the rear tank when I bought the truck.
I think its fuel starved, and have not checked fuel pressure yet. I don't have a gauge and I am not sure of an easy way to test fuel pressure from the pump to the injectors or if I should also be looking at the push from the tanks to the fuel pump up front.
What I think should be done (but of course asking for your assistance), is to check the fuel pressures with a pressure gauge. Looking for help here on how to get this accomplished.
Check for any noticeable leaks.
Maybe change the oil to a known diesel oil to make sure there is no issues there? (I cannot see this being an issue, the guy I got the truck from was particularly good about using Rotella for the oil changes).
Any help for this beginner is greatly appreciated.
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