TPS issue :)

[SKINY]

is there a way to cure this folks ? can it be striped out and cleaned ? it hunts above idle when im at lights/stopped. when i disconnect it the EML comes on and it dosnt hunt as much. it a 98 1.3 with 82,000ml. i will start a thread tomorrow on it. fucking love it

[Stu]

Hunting at idle is usually due to the idle up assembly under the throttle body getting a bit chocked up with corrosion (its common). The system works via the water lines that run to the throttle body which which operate a wax diaphram that bleeds air past the throttle plate when its cold. There isn't any ecu connection to it. You can pull it all off and clean it to remedy the problem.

Which plug where you pulling off? Most don't throw a check engine light except maybe the TPS if you pulled that one off?

Good luck

[SKINY]

Hunting at idle is usually due to the idle up assembly under the throttle body getting a bit chocked up with corrosion (its common). The system works via the water lines that run to the throttle body which which operate a wax diaphram that bleeds air past the throttle plate when its cold. There isn't any ecu connection to it. You can pull it all off and clean it to remedy the problem.

Which plug where you pulling off? Most don't throw a check engine light except maybe the TPS if you pulled that one off?

Good luck

ah yes the TPS is what i meant lol

[Stu]

Haha all good. Yeah try cleaning the throttle body out first, you need to take it off to do it. Make sure you put the water and vac lines back on the right way around otherwise you risk filling the engine with water.

[SKINY]

will do that first then, may have a known working one of another Toyota but need to check part no,s are the same.

Edited February 3, 2016 by SKINY

[SKINY]

anyone any advice on this ??? im using a ROLLA mani and throttle body, getting code 33 intermitadly and idles at 500ish rpm

[SKINY]

seriously folks, near 200 veiws and no-one can advise me ?? Thought this place was a fountain of knowledge fuck sakes

[Stu]

Did you clean it out like I suggested?

[richardc9052]

as above. the fountain of knowledge only works if you listen to it.

[SKINY]

yea all cleaned but still nowt also its the other sensor on the back, not tps as first suspected

[richardc9052]

Take the intercooler piping off the throttle body and then start the car and let it idle. When it hunts up and diwn, place your finger over the hole on the bottom of the inside of the throttle body. If that stops it you need a new wax valve (bottom part that's bolted to your throttle body)

If not, try unplugging your iacv which is at the other end of the inlet manifold.

Unless you have a vac leak somewhere either one of those is your problem

[Stu]

^This.

To clean the idle wax diaphragm you need to take the whole thing apart and carefully clean it out, they fill up with scale and rusty water. In my experience this is the cause for 95% of all hunting issues.

[SKINY]

its a NA folks with Rolla Mani and throttle body

[SKINY]

so how do i clean the iacv then folks

[Stu]

Pretty much a sealed unit from memory. Did you try what Richardc9052 said about the throttle body?

Take the intercooler piping off the throttle body and then start the car and let it idle. When it hunts up and diwn, place your finger over the hole on the bottom of the inside of the throttle body. If that stops it you need a new wax valve (bottom part that's bolted to your throttle body)

If not, try unplugging your iacv which is at the other end of the inlet manifold.

Unless you have a vac leak somewhere either one of those is your problem

[SKINY]

yes tried it and still no diffrent, when starting from cold it sits about 800rpm until it warms up, then it drops to 500ish. it dosent hunt at all but still chucks code 33 iacv valve intermititly. i have the one of the origanal starlet throttle body here so, how do i clean that then ??

[EP70-PT]

I had it removed for my itb's and when I didn't plug the sensor in, it threw me a code too, plugged it back in (does nothing, it's hanging in the bay) and the code went away.. still have trouble idling though..., been playing with the idle screw bit not much luck...