tps voltage doesnt seem right.

vicma762004 · Sep 13, 2007

i checked my tps volatge this morning anf found out it was at 1.12.

can i adjust, i hear diffrent with the 94/95 model.

dont kno what to do since the regular should be .50 - .98 according to a shop manual.

has it gone bad? I TOOK IT OFF AND REALLY JUST NOTICED SOME WEIRD SHIFTING POINTS ON MY GEARS, dont know what that has to do with the tps.

how do i know when its time to buy a new one, very low on cash and dont want to spend where i dont need to.

the car seems to be running rich, wondering if this is the problem.

QIKGTS · Sep 13, 2007

Some will beg to differ but on 94-95 5.0's the computer doesn't care what the TPS voltage is at idle. It looks at that number and then looks for changes to it. With that info, it knows how far the throttle is open. Don't sweat the adjustment, it's not worth it.

You can check the TPS with an analog ohm meter by slowly opening the throttle blade and looking for any dead spots that totally open the circuit up (the meter will read really high resistance). If you see any, it's time to replace it..

Matt94GT · Sep 13, 2007

Lots of people will say it doesnt matter. But I stand by my word mine was about 1.15 and I put it to .95-.98 after driling out the holes more and it seemed to help my hanging idle and idle all around...I checked again about a month or so later and it was still at .98 it didnt seem to reset like people say. I did it with ignition on, engine off.

QIKGTS I dont think I ever really went slowly thru the throttle to check for dead spots...by dead spots do you mean it will read infinity or what?

t

QIKGTS · Sep 14, 2007

Matt94GT said:
Lots of people will say it doesnt matter. But I stand by my word mine was about 1.15 and I put it to .95-.98 after driling out the holes more and it seemed to help my hanging idle and idle all around...I checked again about a month or so later and it was still at .98 it didnt seem to reset like people say. I did it with ignition on, engine off.

QIKGTS I dont think I ever really went slowly thru the throttle to check for dead spots...by dead spots do you mean it will read infinity or what?

t

It's not a matter of the voltage changing at the TPS and the computer resetting it. The eec takes a baseline of the voltage, then looks for changes to it to determine throttle position...

The meter should read very high resistance. With an analog meter, you'll see the needle jump when you hit a worn/dead spot on the potentiometer.

WifesBudget94GT · Sep 14, 2007

so the tps causes hanging idle?.... what else could cause it.

ryclef331 · Sep 14, 2007

As stated before lots of people will argue about the TPS reseting everytime you start the car. I'm a firm believer that it doesn't. REGARDLESS though....a bad TPS is a BAD TPS. SO like stated before....dead spots or spikes in the sweep of the throttle indicates a bad tps and it should be changed. I'm a FIRM believer that the TPS should be ideally at .99v and close to 5v at WOT.

As for the guy that said his car shifted funny with it unhooked....thats b/c the ECU no longer knows how far your foot is on the pedal...if it doesn't know, it can't compensate.

A hanging idle can be caused by a improperly set TPS, faulty TPS, or a faulty/dirty Idle Air Control Valve among other things but those are the biggest offenders.