Question about 1990 Ford F350

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1990 Ford F350 7.3 diesel engine noise

I bought an ex-Uhaul truck and it sounded good and ran great until I got it home, about 6 hours travel time with a load of 5,000 lbs of grass seed. The next day when I started it, it made a really bad thumping sound coming out of the intake. I sounded like a bad exhaust leak. The engine is still very powerful, starts instantly, idles good, runs good, hits on all eight cylinders, and has no other visible problems. Suggestions have been a burned exhaust valve or a cam lobe wiped out. The guy I got it from said "he had told me about the problem, he thought. yeah, right". He said if you ran it for 30 to 45 minutes, the noise, which was an air flow flap, would stop. Naturally, we tried and that didn't work. I could sure use some help. thanks, Eddie

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  • big_ed48 Nov 14, 2008

    thanks guru, my cousin who is a retired heavy equipment mechanic also thought it might be fuel injector related. The mechanic at the repair center where the truck is now is the one who says it is a cam lobe problem. How can I tell if it is injector related. Is there a test that would help? It would take about 6500.00 to replace the engine with a rebuilt Jasper engine. I only bought the old truck to move from my old house to a new one at a slow pace and not have to rent a moving van. I guess if I have to install a rebuilt engine I'll have to keep it till I die. I'll never be able to sell it for half of what I have spent on it. What a bummer. Is there something that the guy I bought it from could have done to conceal the problem from me until I got it home? Should I try to identify the faulty injector and replace it before replacing the engine, just to see if it might be the problem? Just hoping to find a cheaper solution. thank you so much for the quick response. Eddie


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Big Ed, you ever find out for sure what the problem was with the ex Uhaul truck motor? I have the exact problem with my 7.3 right now. Thanks, H.

Posted on May 21, 2011

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Is it turbo charged?

Posted on Nov 12, 2008

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This most likely is fuel injector related.

Posted on Nov 12, 2008

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