94 celica ST idle flucation, cant get the idle to be steady. Options

[rapid36]

Hi everyone my 94 celica ST has a idle fluctuation when im in gear and have the fans on. when the fans go off i idle at about 1k. normal idle in park with no fans or accessories on is about 1.5k which I know is a issue, I replaced the fuel filter, spark plugs and spark plug wires, o2 sensor, throttle body and TPS from another celica but I dont think I aligned the TPS correctly? Do you think this may the cause? If so does anyone know how to properly re adjust the TPS sensor onto the throttle body?

https://youtu.be/mmk4e4pkoo8

Im also getting a code 25 which says "The air/fuel ratio feedback compensation vlave or additive control valve continues at the upper (lean) or lower (rich) limit for a certain period of time." And noticing this I had another set of fuel injectors that was off my old celica which ran just fine and put those on so I dont think its the injectors. Any help is appreciated.

This post has been edited by rapid36: May 17, 2016 - 11:43 AM

[Box]

With the TPS you need to bridge TE1 and E1 before adjusting to whatever resistance is specified by the book I believe, I want to say the AutoZone online manual section might have the needed information. Any vacuum leaks could cause high idle as well.

[rapid36]

With the TPS you need to bridge TE1 and E1 before adjusting to whatever resistance is specified by the book I believe, I want to say the AutoZone online manual section might have the needed information. Any vacuum leaks could cause high idle as well.

Hmm, ok so cleaned out the IAC and it moves freely, and it did even before I started cleaning it, so I dont think that was the issue, however I did replace the IAC sensor with the one off the other celica and it doesn't seem to hesitate as much now, now it will do it a few times then level out then 20 seconds later hesitate a few more times and then level out again. So maybe both these sensors are bad and just need to be replaced, and I think THAT should fix my idle fluctuation, which before I go throwing money at the car I will try to test resistance and such like what you stated then if its out of spec (with TE1 and E1 terminals jumped) I will replace it with a new one.

I still have a high idle though, that part didn't seem to change at all, any suggestions on what could be causing that? I replaced ALL vacuum lines with new ones, cause the car sat for a while and wanted to make sure I didn't have a leak so I replaced them all. I still may have one and not know it, but I am not leaning towards that possibility.

This post has been edited by rapid36: May 18, 2016 - 11:56 AM