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#1
12-11-2009, 11:05 AM
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99 f-250 powerstroke revs high
when i start my truck it idles good ,then after about 2 minates it goes up to 1000 rpms untill i touch the peddle then it goes back to normal then after a few minates it goes back up ,anyone got a clue
thanks bob 
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#2
12-11-2009, 01:19 PM
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Re: 99 f-250 powerstroke revs high
At operating temp.,disconnect the battery for 5 mins. Restart at operating temp, w/ you foot on the accelerator, have someone disconnect the IAC. as the Idle drops out, maintain it at 650 RPM with the accelerator for 2 mins. then turn off the engine for 1 minute & plug the IAC back in. restart and let Idle for two mins. shut off for 1 minute. Restart, put foot on brake & let Idle for two minutes. shut off for 1 min. What do you have for an Idle now? This assumes no active error codes or Vac leaks when performed.
__________________
"Saving the World......One Ford Truck at a Time!"
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#4
12-12-2009, 09:09 AM
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Re: 99 f-250 powerstroke revs high
had a crank sensor put it in recently?
__________________
"When Lightning Strikes the Heartbeat Stops!" '91 Mustang LX 347 StRoKeD & BlOwN '04 Ford F-250 6L PS FX4 '95 Ford F-150 Ford Racing Pride General Motors who?  2004-2008 Ford Master Certified Technician
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#6
12-12-2009, 11:28 PM
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Re: 99 f-250 powerstroke revs high
Sounds like Exhaust back pressure sensor on the front of the motor.
__________________
"When Lightning Strikes the Heartbeat Stops!" '91 Mustang LX 347 StRoKeD & BlOwN '04 Ford F-250 6L PS FX4 '95 Ford F-150 Ford Racing Pride General Motors who? 2004-2008 Ford Master Certified Technician
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#8
12-20-2009, 07:19 PM
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Re: 99 f-250 powerstroke revs high
Quote:
__________________
"When Lightning Strikes the Heartbeat Stops!" '91 Mustang LX 347 StRoKeD & BlOwN '04 Ford F-250 6L PS FX4 '95 Ford F-150 Ford Racing Pride General Motors who? 2004-2008 Ford Master Certified Technician
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