6G Celicas Forums

My car has been idling badly lately. When the engine is warm the idle will either pulse from 1 to 2 thousand rpms, or it will barely stay running at around 500 rpms. When it is idling at 500 rpms, sometimes i hear a click, then the rpms jump to 1000 and the radiator fans turn on. I checked over all the vacuum lines and found one that lead to nowhere, and i cant find where it is supposed to go. it is connected to a sensor of some sort, not sure what one. That sensor also has a wire that is not plugged in and i cant find where that goes either. the line not connected to anything has vacuum when the car is idling at 500 rpms, then stops when the rpms go to 1000 and the fans turn on. im pretty clueless when it comes to vacuum lines and need help!


Wire that doesnt connect to anything is in the blue box. vacuum line that is not connected to anything is in the red box.
This sensor is right under the intake manifold.

take a pic from the whole engine bay with exact location please + engine is it 2.2 or 1.8

under the intake manifold where the arrow is pointing to. it is a 1.8.

come on guys, I need help!

Anything like the problem im having??


Video here!

not really sure, my car has never actually died like that. but i guess that i never let it die and keep giving it gas. it could be the same thing though.

First guy, fix the vacuum leak, I think those go to the AC idle up line. If that helps but still doesnt fix the problem look at your TPS, and grounds. and follow my suggesstions below.

The second guy Tom88 with the video it sounds like your TPS sensor needs some major adjustment. Toyota did a decent job adjusting them, but they could be made a whole lot better. If yours is something other than Toyota which it looks like it is, maybe its just the wiring showing, I suggest going back to the original.

In order to adjust your TPS you need to take the TB off the car. proceed to take off the TPS now for the adjustment, replace it back on the TB bar, depending on what type ot TPS you have either 3 pin or 4 pin will change the settings. Im going to be brief about this, if you want it in more detail i can do a write up. Study the TPS, the way its suppose to work is....THE TPS has to move exactly at the same time the throttle plate does. so the tps is off, and the throttle plate is off, you need to line these up so as soon as the throttle plate is tapped the TPS moves. there should be no slack whatsoever, otherwise this will throw your idle off, and will give you bouncing idle. and the TPS has to be off when the Throttle plate is off. Thats the one biggest thing I notice with all Toyota owners, the TPS is always out of adjustment, even from the factory they arent setup 100 percent, they are just 85 percent done well.

I have a 3 pin TPS, and i can remove the back cover to see the adjustment, and what a difference it makes when its setup properly. The car idles much better, and has alot more torque down low.