4000RPM Idle... TPS Question

[Solo500]

I recently had the CEL come on for low voltage on the TPS. I just replaced it with a TPS Sensor from AutoZone and it idles at 4000RPM! I unplugged it and the idle dropped to 1200 but then shot back up to 4000rpm. I checked and there's no vacuum leaks or codes being thrown. What could be the culprit?

EDIT: Yes I reset the ECU

 

[drivebymashing]

whats wrong with a 4000 rpm idle? power shifting would be nice and easy...
whats about the intake gasket would that make it have a higher than normal idle

 

[99cobra09]

Sounds like your IAC valve is shot.

 

[Solo500]

Replaced the IACV and no luck. I'm going to re-check all the vacuum hoses.

 

[Chris98vobra]

This can also happen if the EEC is trying to correct for a very rich situation. It uses the IAC to add air. What do your fuel trims look like?

 

[OldSVTGuy]

You may have to let the computer "learn" the new TPS, assuming it is good. Disconnect the battery cables for about 20 minutes. Then reconnect and start. Hopefully, your ECU will learn the new sensor. Otherwise, like the others, I'd suggest a vacuum leak or a bad IAC. Also, same for the IAC as I see you replaced that, too.

Check over your work and see that all your vacuum lines and intake tube connections are tight.

Good luck.....

 

[Solo500]

The tune is perfect. I'm thinkin it may have something to do with the EGR.

 

[jareds99slobra]

maybe w the tps when u unplug it if its getting good voltage the car will idle up and down. the iacv will also make it do that. idk if the egr would have a lot to do with it ideling that high

 

[SN8KBYTE]

I would start with a Ford TPS and return the Autozone one.

 

[yeller1]

You may have to let the computer "learn" the new TPS, assuming it is good. Disconnect the battery cables for about 20 minutes. Then reconnect and start. Hopefully, your ECU will learn the new sensor. Otherwise, like the others, I'd suggest a vacuum leak or a bad IAC. Also, same for the IAC as I see you replaced that, too.

Check over your work and see that all your vacuum lines and intake tube connections are tight.

Good luck.....

I would try what oldsvtguy suggested. Disconnect the battery for a bit to clear the keep alive memory. I remember on my 5.0, it usually took me 30 minutes to clear it. Not sure how long on the 4.6, but if he suggests 20, go for it.:rockon:

 

[99cobra09]

I would start with a Ford TPS and return the Autozone one.

+1, different electric components have different voltage operation,ohms, etc. Return that one and buy the one from Ford.

 

[01yellercobra]

Dumb question....Is the throttle closing all the way? Maybe when you swapped the TPS something got stuck.

 

[Solo500]

I've disconnected the battery overnight, unplugged the iacv and tps and still no luck.

 

[01yellercobra]

Make sure the TB is physically closing all the way.