Question about 2000 Ford F250 Super Duty Crew Cabs

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Dies running at various speeds/rpm's. no codes stored sometimes it restarts in 30 seconds. Sometimes has to be towed to mechanic. Mechanic gets in it and it starts. Diagnotics one time found air/fuel mixture adjustments by computer were changing right before it shut of. I would not do the same thing everytime. But what was observed was adjustment to 99% gas or 99% oxygen. It either cut out all gas and went all oxygen or went all gas and no oxygen. But again no codes were stored in computer. The mechanic that observed this action was absolutely baffled! This truck is important to me as it was my late father's and was special order from Ford to tow his travel trailer. I inherited the truck and love it when it runs right. And when it acts up I am never close enough to walk home. Which leads me to feel the need to treat it like a lame horse. please help I'm going nutts with this. I have replaced the fuel pump, mass air flow sensor, a wiring harnes, tune up, fuel filter, the list goes on and on!

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The items that cause changes in the air/fuel mixture are
Heated oxygen sensor( in the exhaust manifolds before the cat converters
Map sensor
Baro sensor
Maf/vaf sensors
intake leaks ( vent on canister , vacuum hoses etc )
failed cat converter blocking exhaust system
The first place I would look at is the heated oxygen sensor(HO2S) as it has rather delicate wires that regularly fail and that causes erratic messages to the ECM

Posted on Mar 07, 2017


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tell your mechanic to replace the fuel filter. This part is usually less than $10. It should be replaced aout every 50K miles.

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yes very very common code for these motors i get them all the time. now the first thing i do is listen to the pcv valve for noise if it is rattling this is the problem and is the most common of all. another thing is the intakes leak from cracks in them but the only way to find it is with a smoke machine. now the one other thing i have seen before is debre like a leaf in the mass air flow sensor but you have replaced it so most likely no that.

do your self a favor and change the pcv valve it only cost under 5 dollars. if this is not it you will need to find the leak in and around the intake or a vacuum hose.

because you have two lean banks this mean if it is a leak then it has to be in common with both banks and that is the vacuum line system intake etc...

let mew know if you have any more question. good luck man

Posted on Oct 21, 2009

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SOURCE: 1988 Ford ranger 2.9 standard

Change the stater in the distributor(hall effect).

Posted on Jan 05, 2010

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could be the cam sensor....and maybe cracked cap, bad plugs cloged fuel filter bad wires...

Posted on Jul 09, 2010

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