Help diagnose my truck's problem !!!!! - Ford Powerstroke Diesel Forum
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Old 06-05-2013, 11:13 PM
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Exclamation Help diagnose my truck's problem !!!!!

I need help diagnosing a problem. I have a 2000 F-350 crew cab 4x4 w/7.3L practically stock other than a leveling kit and 315 tires. I had to replace the high pressure oil pump seal and primary fuel pump seal in 2009. The guy said it was the first time he had replace the seals, usually it was a bad pump he replaced. This was about the time the price of a gallon of diesel was so high, so I put stock tires back on it for better MPG. But since the replacement of the seals the truck has not had the power it did or got the MPGs it did with stock tires. It use to launch you back in the seat with a little more foot to the pedal, now it is a slow steady acceleration that does not set you back in the seat like it once did. I also usually pull a 16 ft livestock trailer with about 5500 to 6500 lbs live weight to the stockyard. Pulling light grades the pedal to the floor 55 mph, no turbo kicking in, the truck will pull but lacking to 2/3 the power it use to have. I have had it checked by a former ford diesel tech that opened his own shop and builds pulling trucks. He said the truck met all factory specs, the only thing he could find was a fault in the 8th injector pressure fluctuating, so we put a new injector in it but no change. He suggested a programmer might bring it back to life. So I decided to make some changes to help then to. I had him put on a diamond eye dual 4 in. exhaust and a Volant cold air intake and radcliff’s oil and fuel crossover lines. Well I tried three of SCT’s programmers and a Hypertech programmer. I had the best results out of hypertech with a lot lower rpms, but harder to start with the truck programmed on either programmer and still no power increase. I took it to a Ford dealer and had the computer reflashed, no different. Recently while inquiring about my problem, someone mentioned the high pressure oil pump may have gotten out of time when the seals were replaced, another person said it could be a torque convertor getting weak, another guy questioned the turbo not kicking in or a waste gate. Does anyone have any ideas what my problem is or has anyone experienced the same problem and what can I do to fix it? I would like to get the truck fixed back to its orginal power then try to get a little more power with a programmer or chip. I would appreciate any ideas on what is causing it and how to fix it.

Last edited by tnmtnmn; 06-05-2013 at 11:17 PM. Reason: errors
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