Ok, with the help of others from another site I have found that my FIPL is not operating like it should.

The FIPL is way off the specs that it should be. Using the middle wire on the FIPL I have set it to idle at 1.2 volts, yet at wide open throttle it is reading 7.8 volts when it should be closer to 4.5 volts. Has anyone had a similiar problem?

Also, the Orange/White wire on the FIPL has no reading when it should have 5 volts. The Black/white wire is reading 11 volts when it should be .025 volts.


any thoughts?

Thad

 

replace it?

 

Oh, I forgot to mention that this is a BRAND NEW FIPL.......

 

if you still have the old one, test it the same way. will tell you if the prob is with the fipl or the system. if the system, first thing i would do is disconnect and clean and reconnect connectors, including the pcm.

 

PCM....not familiar with too many accronyms....except Army ones....

Honestly, at this point I think there is a wire thats grounded out somewhere or something really quirky....

 

pcm= powertrain control module located under driver's kick panel? the brains behind the trans.

 

there should be no more than 5 volts present if so there is a short to vehicle power somewhere or the pcm,s referrence voltage circuit is damaged , also check your ground wire there and see if it has continuity to ground or is open

 

Thanks for the info. Give me a short step by step process to troubleshoot this if you have time. I am not a FORD guru but not an idiot.....

 

there are three wires , one is VREF (referrence voltage ) it should read 5 volts , teh second wire is signal return , the third is ground , the fipl works by changing the resistance and grounding vref voltage through the potentiometer thus changing it from about 1.0 volt at idle to about 4 volts at full throttle , the ground wire should be black in color and should have no resistance to ground in it , the Vref wire should have only 5.0 volts present if there is more go to the PCM connector behind the left inner fender apron and remove the connector it is retained by one bolt with a 10mm head find the matching wire color and check it there for continuity and also for any voltage with the key on , there should be no voltage present with teh pcm disconnected if so there is a short to power somewhere the easiest repair would be to overlay the circuit and not a bad idea due to the age of the wiring , by this i mean you disconnect the original wires near the fipl and the pcm and add new wires bypassing the old ones . if you have more than 5 volts you need to find the source if it is there with the pcm disconnected ggod luck

 

Which box do I take the 10mm bolt out of.....going to give it a look tomorrow but I have two boxes that have a 10mm bolt....Thanks

Thad

 

There is one long "vertical" connector with 62 wire holes that is the PCM. Closest to the fender!!

 

Thanks....

 

Ok I checked and I had no voltage reading.

I checked all the PCM wires for voltage and only one had voltage. It was yellow. I would assume that it would be for some good reason and not a short. Or am I wrong? It was the bottum corner wire.

Thanks
Thad

 

you need to check only the three wires at the fipl one is ground the other is signal return and the third is referrence voltage it should have 5.0 volts

 

Yeah, I did that last week and I got some crazy numbers.

Vref= 0 volts
Signal wire= 1.1 to 7.8 volts (idle to WOT)
Ground= 11 volts

Thanks, why I have moved on to try other solutions!!!
Thad