Question about 1990 Ford F250

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Rarely used PU. Has code 41 too lean. Starts and runs fine 1st 1/2 mile.

Have disconnected and plugged every vacuum line I can find one at a time. No change, fuel pressure seems constant at 35# HELP!

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Having owned and fixed many Fords, I have a few thoughts for you.

1- run some gas line anti-freeze through it, the methyl hydrate can clean a lot of crap out. 2- Fuel inject. / carb.cleaner. 3- new air filter. 4- new fuel filter. 5- It's not very likely, but if the other fixes don't work, you could do a rad flush, improper heating/cooling can do strange things. Also, smell the oil, if there's a gas smell that could mean a variety of things, some bad, some not. Hope one of these works for you. Grimm

Posted on Apr 11, 2015

  • Ron Manning
    Ron Manning Apr 11, 2015

    Thanks, Brother Grim, I have it minus the airfilter, no change. One thing you said is new for my PU. The smell of oil, as if dropping on the exhaust, but no oil seen. Temp gauge is normal reading and fuel press. stays at 35#. Its FI.

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