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| F Series Forum covers questions and discussions regarding Ford F-150, Ford F-250, Ford F-350, Ford F-450, Ford F-550, Ford F-650, and Ford F-750. |
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#1
02-23-2005, 02:55 PM
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F350 has mind of its own
Good afternoon.... We have a 1996 F350 with the 460 cid and three speed tranny. We knew the truck had a few problems when we purchased it but this one has us stumped for the moment. If the engine is set to and held at 2000 rpm after a few seconds the engine will throttle back to 1500 rpm by itself. It is smooth running, starts easily, has no smoke in the exhaust, however the check engine light does not come on when the key is turned on. The truck also has a considerable power loss as the road speed is increased. Power 'seems' good from a standing start up to about 45 - 50 mph and then it just seems to run out of power.... if it is kicked down to 2nd gear the engine revs up but power is not there... no pre ignition just no power. Sort of like the feeling if the vacuum advance is not functioning in cars from 'my era'. Check to see if there was a mass air flow sensor but didn't see one and didn't think the throttle position sensor should cause this problem.
With Kind Regards, John 
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#2
02-23-2005, 02:58 PM
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I did fail to mention that I checked the back pressure on the CAT and it was about 1psi at 2000 rpm.
John
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#3
02-23-2005, 10:24 PM
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do an egr valve check. I would make a block off plate out of an old coke can and see if you still have the same problem
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