problems with exhaust system

1985 FORD F-250
V12 • 4WD • MANUAL
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BUGABOO
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my dads 1985 Ford F250 is not running right. it has a rough idle and when you rev it to get going it quits. it has been losing power for a while. my dad thinks it is the exhaust system. it is a diesel truck. it doesnt have a CAT
Jan 20, 2011 at 9:25 PM
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FORD MAN
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My answers here are just a guess, but i'll try. When was the last time the fuel filter was changed? Has this motor got a turbo? Is this an electronicly controlled motor? If it does have an ECM (computer), does the computer show any codes? How many miles on motor? It sounds like it has either a weak fuel pump, or a plugged fuel filter.

Ford Man in Michigan
Jan 20, 2011 at 10:26 PM
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BUGABOO
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the fuel filter was just recently replaced. it does not have a turbo. this is the engine type 6.9L V8 OHV 16V DIESEL.
Jan 27, 2011 at 5:35 PM
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FORD MAN
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Mixed answer you gave.....mid 80's Fords (pick ups) had a 7.3, V8 non turbo (thank you) OHV motor in them. Depending on how many miles this thing has on it, it may be worn out ! At around 250/300 thousand miles it is going to need a motor overhaul. It should have a computer in it (ECM) that controls the fuel injector timing, & this computer needs to be checked for any codes it may have stored. The only guess I can make...is that the motor is worn out, or the fuel pump(s) are getting weak in their old age.

Ford Man in Michigan
Jan 27, 2011 at 6:17 PM