[adkins112]

I am out of ideas. Need some help. When i drive down the road my truck is ok at first then after about 15 mins it starts cutting out and the check engine light comes on and the pedal quits workin and drops to an idle. but as soon as the check engine light goes off the truck works again for a minute. then back to the same ordeal. ive checked the oil, replaced the throttle pedal assembly, and fuel filter. i was going to get the code pulled but it doent stay on long enought.

thanks.

 

[Grummin]

maybe the CPS??

 

[action4478]

The symptoms you are describing are a bad TPS or IVS...I don't get it if you have already replaced them//

What were the symptoms before?".....

 

[adkins112]

i replaced the pedal assembly. and the symptoms havent changed since it all started after fueling up the other day. sorry but im kinda new as this was is IVS stand for?

 

[action4478]

Idle validation switch,,, It's on the pedal you replaced....

Accelerator Pedal Sensor
The Accelerator Pedal (AP) sensor provides the PCM with the driver's demand for power. The AP sensor is a three-wire potentiometer that receives VREF from the PCM and returns a signal to the PCM directly proportional to the accelerator pedal position. The AP signal is used in calculating fuel quantity. Also, the AP input is used by the PCM to control the exhaust back-pressure regulator.
A PCM detected fault of the AP sensor will illuminate the Malfunction Indicator Lamp in the instrument cluster. An AP signal that is detected out of range, high or low, will cause the PCM to only allow the engine to operate at low idle.

Idle Validation Switch
The Idle Validation Switch verifies when the accelerator pedal is in the idle position. This switch protects against in-range failure of the AP sensor.
A PCM detected fault of the Idle Validation Switch will illuminate the Malfunction Indicator Lamp. An inoperative Idle Validation Switch detected by the PCM will only allow the engine to run at idle.

 

[adkins112]

thanks well put. so what do i need to do to fix it?

 

[action4478]

Did you get a light or a code?....

 

[adkins112]

no it doesnt stay on long enought to get it checked. it goes on and off. and it seems like everytime i pull in somewhere to get it checked it goes off.

 

[action4478]

There should still be a code in memory...Make sure you have everything plugged in well

If you can ,get the codes read...

Others may have better Ideas....

It may not hurt to replace the CPS ,, it's a now a cheap test.....

 

[adkins112]

thanks for the help.

 

[action4478]

You're welcome ...Hope you get to the bottom of it....

I'll keep watching the thread....

 

[adkins112]

ill keep ya updated. hopefully it works, i am quickly running out of money.

 

[action4478]

Are you sure it still idles when this happens or does it run rough?

 

[arisley]

Check to make sure your connector on the pedal is in good shape.

 

[adkins112]

it idles great and the connecter is good i checked it out just a little bit ago and even put some electrical grease on it. took it for a drive and the same thing happens. althought it didnt seem as bad as it was before. it still cuts out but it seemed to come back quicker. and the cruise control doesnt cut out at all. im lost!!! /ubbthreads/images/graemlins/shrug.gif

 

[klhansen]

Like someone said before, if the SES light came on, there WILL be a code stored.

The best thing for you to do next is go get it scanned by someone with a PSD capable scan tool. Maybe a member with AutoEnginuity who's in your area (check the HELP NETWORK ).

If it comes back with a accelerator pedal or IVS code, then start checking the wiring from the pedal assembly back to the PCM, there may be a chafed wire or loose connection.

 

[dougdoug]

[ QUOTE ]
it idles great and the connecter is good i checked it out just a little bit ago and even put some electrical grease on it. took it for a drive and the same thing happens. althought it didnt seem as bad as it was before. it still cuts out but it seemed to come back quicker. and the cruise control doesnt cut out at all. im lost!!! /ubbthreads/images/graemlins/shrug.gif

[/ QUOTE ]

if the cruise control still works, that would be a sign that it has something to do with the pedal. the cruise control doesnt use the pedal to operate, and therefore you wouldnt see any problems. try setting your cruise control and run for a few minutes, and then hit the go pedal. if it starts acting up once you hit the pedal, then theres your problem.

 

[adkins112]

the cruise control still works even when the pedal doesnt. but the pedal is brand new from ford so i dont know what to do. monday i am takin it to my shop and gettin it scanned.

 

[arisley]

Bad new part?? It happens.

 

[adkins112]

could be.