Question about Ford F-250

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I just bought 1998f250 Auto. Engine runs good, but when I put it in drive it runs like H-LL until up to speed. Once up to speed it feels smooth. Then alot of the stops are ok with no hessitation, but comes back a bit.

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  • Kelly Aug 07, 2009

    Im leaning toward a vacum problem because engine is smooth anytime transmision is not in gear. Am I looking for pcv valve, vac module of some sort?

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  • Ford Master
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Notice it more when a load on engine, like AC on, ? Stalling at all when off the gas, in a turn, or sitting? Are you saying it misses until you get to desired speed?

Posted on Aug 08, 2009

  • Mike Butler
    Mike Butler Aug 08, 2009

    Is that a 4.6L, or 5.4L engine?

  • Mike Butler
    Mike Butler Aug 08, 2009

    Before replacing any parts, I'd get a can of throttle body spray cleaner , and with engine off. open up the throttle and spray plate and area good and make sure you spray good into the port where idle air control valve is mounted on side of throttle body near front of throttle body. That may be all that's needed.
    After trying that, I'd drop in to an autozone, Pep Boys, or similar big autoparts store & have is scanned for trouble codes, just to see what, if any codes come up. That would hopefully point you/us in right direction, rather than replace parts on a guess..Have you located EGR, and tried removing connector or vacuum line to it and plug it, or both to see if that changes anything?


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  • Master
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Hi there,

try adjusting slow speed valve........ 
adjustment:
Start by screwing the slow speed adjustment screw just until it seats gently, then back it out 1-1/2 turns.

Start engine and set the rpms to where it just stays running. Turn valve in increments of 1/8 turn, giving the engine a few seconds to respond. As you turn the valve in, the rpms will increase. Each time, Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

When you have finished the above adjustment, you will have no reason to adjust it again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Good Luck!!

Thanks

Posted on Aug 07, 2009

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