TPS problem?? need help asap

[NotchedPsi]

currently putting gn drivetrain in my mustang been a project for the last three years, car should be running after i get a new fuel pump, but the issue i have is the my tps reading are 180 out, when at idle the reading on my xfi is showing its at 90% wide open throttle and when im at wide open throttle its goes to nothing, i have a brand new rjc polished intake plenum any help would be greatly appreciated just not sure whats goin on with that,

 

[TurboDave]

You've got a couple wires crossed. I'm guessing you have the 5 volt and ground wires crossed.

 

[mikestertwo]

Like Dave said. Either the tps is wired backwards or your using the wrong tps sensor.

 

[NotchedPsi]

I have a full engine harness ordered direct from xfi tho, everything is plug and play. If I can just switch wires ill do so, just an odd problem hopefully ill get it squared away soon thanks guys

 

[1985GN]

if i remember correctly this problem was there with both the stock wiring harness and now the aftermarket xfi harness. tried a known good tps and still same problem.

 

[NotchedPsi]

any other ideas?

 

[TurboDave]

Have you tried reversing the 5volst source and ground?? Have you tried anything?

 

[NotchedPsi]

we havent tested anything yet, looks like thursday well get a chance too, just tryin to find as many things to try to fix this prob as fast as possible thanks tho i appreciate the advice im still new to the buick world i guess

 

[Jerryl]

Post a pic of the TPS. Sounds like you have the 84-85 sensor.

 

[NotchedPsi]

ill take some pics later today and post them

 

[garyk1970]

Post a pic of the TPS. Sounds like you have the 84-85 sensor.

bingo!!!!! 84.85 are reversed.....buy a 86 or 87 and you'll be set....

 

[NotchedPsi]

thanks guys i appreciate all the info,

 

[NotchedPsi]

here are some pics

 

[NotchedPsi]

prob solved, its was a wires mixed up thx for all the help, heres it funning for first time

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[Jerryl]

prob solved, its was a wires mixed up thx for all the help, heres it funning for first time . . .

Glad you got it running. Although it is at a very strange angle, obviously, you have the correct TPS.

 

[NotchedPsi]

Tps wasnt set when pic was taken that why position was odd, but some small things to get done and hopefully ill be driving it soon

 

[turbo96max]

a bit off topic, but somewhat related, maybe you guys can clear up a question. is it normal to see some varience in the tps while car is on vs off ? w the ign set to on i see .36 close 4.6 wot, w the car running i see .40-4.75 wot. im trying to troubleshoot a sligh sputter i get sometimes onye at wot, no knock, afrs around 12.3-12.5.. part throttle is never does it.