Can anybody come up with anything that would make the computer keep turning the fuel pump on and off over and over with the key just tuned on once with the engine not running?
It is like you keep turning the key on and off over and over but you are not.
Or it is like the computer is running the power up self test over and over.
It is a 1995 F150 5.0L 4R70W.
Tried three different computers so it is not the computer.
Changed the PIP sensor in the distributor three times.
Replace the MASS sensor.
KOEO self-test comes back with a 111.
CM comes back with a 111.
KOER reports Knock sensor not detected.
Check the voltage from the TPS as the throttle was slowly opened, .8VDC CT and 4.5V WOT.
Ref voltage 5.0V
When you start the engine it will start normal and if you let it idle the CEL will flash three times and the engine will rev from 750 RPM to 1500 RPM with the IAC going going from 38% to 58%. The high rpm will continue until you put it in gear then the truck goes back to idle.
Truck will lose power with the CEL/MIL light on when leaving stop sign and you have to floor the throttle to get power and turn off the CEL/MIL.
But this does not seem to set a code.
I though I had a good handle on these trucks but this one has me scratching my head.
Any help would be appreciated.
It is like you keep turning the key on and off over and over but you are not.
Or it is like the computer is running the power up self test over and over.
It is a 1995 F150 5.0L 4R70W.
Tried three different computers so it is not the computer.
Changed the PIP sensor in the distributor three times.
Replace the MASS sensor.
KOEO self-test comes back with a 111.
CM comes back with a 111.
KOER reports Knock sensor not detected.
Check the voltage from the TPS as the throttle was slowly opened, .8VDC CT and 4.5V WOT.
Ref voltage 5.0V
When you start the engine it will start normal and if you let it idle the CEL will flash three times and the engine will rev from 750 RPM to 1500 RPM with the IAC going going from 38% to 58%. The high rpm will continue until you put it in gear then the truck goes back to idle.
Truck will lose power with the CEL/MIL light on when leaving stop sign and you have to floor the throttle to get power and turn off the CEL/MIL.
But this does not seem to set a code.
I though I had a good handle on these trucks but this one has me scratching my head.
Any help would be appreciated.