97 f250 idles rough has no power

[scott1141]

went to fuel up my 97 f250 220,000 miles starts fine idles rough not enough power to drive over 10 mph

[Fordpride]

I'd start by unplugging the connectors to the valve covers and looking for burnt plug and pins

[scott1141]

i unplugged the 4 connectors (2 on each side) they appear fine dont smell burned this is something i would like to try and fix myself but parts are so expensive just want to be sure thats really the problem

[lwillson]

Are you throwing a check engine light? any other indicator lights on?

[scott1141]

no check engine light or any other kind of warning

[madpogue]

Under no load, sitting in the driveway in neutral or park, does it rev up normally?

[scott1141]

no it definately doesnt i can put it to the floor and it barely will rev up

[scott1141]

i pulled the valve covers off tested all 4 plugs that feed the glow plugs and injectors have good continuity through all of them including the cover gasket plugs im at a total loss i wonder if it could be the throttle positon sensor (i think thats what its called) or the cam position sensor

[scott1141]

also forgot to say the glow plugs all read .1 ohms

[madpogue]

Originally Posted by scott1141

also forgot to say the glow plugs all read .1 ohms

Well that's def. wrong. They should all be aprx. 1.0 ohm. Too low resistance means too high current. Still doesn't explain your performace problem. But just to be sure, have checked to see if it behaves any differently after the glow plugs cycle off?

The pedal position sensor (that's what it is, since our trucks don't have a "throttle") could be the issue. If you have access to a scanner that reads real-time data on our trucks, you can see what the sensor is feeding the PCM. There's also a manual test with a voltmeter; perhaps someone else will chime in with the procedure.