Very werid??? - Ford Powerstroke Diesel Forum
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Old 09-15-2010, 04:34 AM
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Very werid???

I have a 99 F250.. go to start truck and starts fine. Start driving and its like the truck shuts down to idel and you hit the pedel and wont go. Sits for a second amd returns to normal. Just started doing this. The motor stays runing and doesnt shut dpwn. I have no idea what this could be??? Has this happend to amyone else and do u know what it is if it did :/..... thanks guys
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Old 09-15-2010, 05:14 PM
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my gf 6.0 did that and it was the EGR valve
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Old 09-16-2010, 08:05 PM
dmd dmd is offline
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6.0 is a complete different engine, 7.3 dont have an EGR...

Probably the peddle assembly, these are fly-by-wire..
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Old 09-16-2010, 08:10 PM
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I would try a throttle position sensor. I think that's what ^^^ was referring to.
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Old 09-17-2010, 03:57 AM
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Anyone else maybe have any input? Just dont wanna start buyng parts that arent the prob .... Th guys for help and if u think y might be able to comfirm what ^^^ said lkm...
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Old 09-17-2010, 05:22 AM
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Sounds like the throttle postion sensor in the foot feed. you can check it if you have a fluke meter. you will find a dead spot in the potentiometer. when you replace it get the whole pedal assembly dont mess around trying to change just the sensor it will work for a while but youll be buying the hole nine yards again soon.
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Old 09-17-2010, 06:20 AM
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Why is that? If it sensor why would it be to change it all? I am unfam with this part of the truck? If this sensor on the truck ,motor? Thaynks guys
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Old 09-17-2010, 07:48 AM
dmd dmd is offline
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It is on the peddle assembly (the "gas" peddle). It is the sensor that tells the computer
what position the peddle is in. In other words it tells the computer how far you are
pushing the peddle. If it is messed up it usually tells the computer that you are not
pressing the peddle, so you just get idle. There is one more senor on the assembly
I believe, it is the idle switch. The idle switch tells the computer that you are not
pressing the peddle at all... Someone please correct me of the idle switch and
the throttle position sensor are in the same part.
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Old 09-20-2010, 02:59 PM
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Just read this in Diesel Power Mag (Sep 2010).

The Accelerator Pedal Position (AP) Sensor:

"...incorporates three potentiometers to track throttle position. Throughout the movement of the AP, the resistance values of the three potentiometers must agree. If not the Check Engine light will illuminate, and the vehicle will continue to perform as normal. If two signals from the AP are lost, the ECM will only allow the engine to idle."
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Old 09-20-2010, 07:53 PM
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My truck had the same problem it was the new pcm that the dealer had just put on truck didn't even get off their lot before it went kaput. They warrantied it and hasn't happened again. Their computer and tech could see that the pcm wasn't responding to the throttle input. Might have a competant dealer or shop diag it for you and then get parts and fix it yourself.
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