idle adjustment, anyone know how? Options

[batcavee00]

does anyone know how to adjust the idle on the 2.2 celica? my idle sits right above 1k rmp and i want to drop it a little without retarding my timing. i was looking to see if there was some kind of adjusting screw like most cars, but i didnt see anything. can anyone help me out? thanks!

[mkernz22]

reset your A/F ratio, that should help a bit.
disconnect the battery, let it sit for a few minutes, then reconnect the battery, start the car, and let it sit for about 5 to 10 minutes at idle. Don't hit the gas or anything. It might be a high idle at first, but it should start to drop after a few minutes.

[trdproven]

not sure if that would help much but im guessing you would have to end up lowering the idle through your distributor. there is no adjusting screw on 5s at least since post 91. i need to do this as well because after i cleaned my IAC the idle went up so now i need to readjust since i picked up the idle first before I cleaned my IAC.

This post has been edited by trdproven: Apr 24, 2012 - 7:06 PM

[Special_Edy]

Pulled the 5s throttle body and cleaned the heck out of it. Then installed new plugs.

Now idle is way up to 1200. Went back took apart the IAC and cleaned it up, and set it for lowest. Now sits at about 900-1000 RPM, not the 750 in the manual, but makes the touchy idle a little calmer. Not intended either, but works.

Double check the ignition timing, it will raise or lower the idle speed if it is not at 10° BTDC. Also check vacuum lines as a vacuum leak will raise the idle. With the engine warm not hot carefully spray starter fluid or carb cleaner around the vacuum lines and the intake, if your rpms increase more you have found the leak.

Does the idle remain the same or drop when you turn on the AC compressor? If it drops to normal rpm with the compressor on then you may likely have a bad AC idle up control valve(not to be confused with the Idle air contr valve) I had one of these go out on me.
The second idle up control valve is located behind the engine on the Power Steering Rack on the passenger side of the car. The hoses connected to this valve are prone to coming loose and falling off.

Also check that the accelerator cable has a tiny bit of slack and isnt holding the throttle open.

Once you have made sure that none of the above items is the cause you can lower the idle speed by adjusting the throttle stop screw. On the throttle body where the accelerator cable connects you will see a small diaphram that pushes the throttle open. Just inside(1/2" closer to the throttlebody) of where the tip of this acuator pushes the throttle is a second screw(mine happens to be a threaded rod with a nut). Loosen the nut and turn the threaded rod farther in till the idle drops to the correct speed. Tighten the nut and you are done.

Try this stuff out and let us know how it goes. Good luck

The idle adjustment screw is a stud and nut on my 94 GT with a 5sfe

[Special_Edy]

Pulled the 5s throttle body and cleaned the heck out of it. Then installed new plugs.

Now idle is way up to 1200. Went back took apart the IAC and cleaned it up, and set it for lowest. Now sits at about 900-1000 RPM, not the 750 in the manual, but makes the touchy idle a little calmer. Not intended either, but works.

Double check the ignition timing, it will raise or lower the idle speed if it is not at 10° BTDC. Also check vacuum lines as a vacuum leak will raise the idle. With the engine warm not hot carefully spray starter fluid or carb cleaner around the vacuum lines and the intake, if your rpms increase more you have found the leak.

Does the idle remain the same or drop when you turn on the AC compressor? If it drops to normal rpm with the compressor on then you may likely have a bad AC idle up control valve(not to be confused with the Idle air contr valve) I had one of these go out on me.
The second idle up control valve is located behind the engine on the Power Steering Rack on the passenger side of the car. The hoses connected to this valve are prone to coming loose and falling off.

Also check that the accelerator cable has a tiny bit of slack and isnt holding the throttle open.

Once you have made sure that none of the above items is the cause you can lower the idle speed by adjusting the throttle stop screw. On the throttle body where the accelerator cable connects you will see a small diaphram that pushes the throttle open. Just inside(1/2" closer to the throttlebody) of where the tip of this acuator pushes the throttle is a second screw(mine happens to be a threaded rod with a nut). Loosen the nut and turn the threaded rod farther in till the idle drops to the correct speed. Tighten the nut and you are done.

Try this stuff out and let us know how it goes. Good luck

The idle adjustment screw is a stud and nut on my 94 GT with a 5sfe

[batcavee00]

thanks guys for the help, i got my car to idle at 800 rpm. i adjusted the screw that gets pushed by the diaphragm on the throttle.

[Special_Edy]

thanks guys for the help, i got my car to idle at 800 rpm. i adjusted the screw that gets pushed by the diaphragm on the throttle.

Hold it! The screw that gets pushed by the diaphram or the one next to it? The diaphram shouldnt be holding the throttle open at an idle, it should only open the throttle if the engine is stalling or being started. The IAC is what opens/closes the throttle to maintain idle and it is inside the throttlebody.

The diaphram only opens if theres a LACK of vacuum, you probably have it hooked up to the wrong port on the throttlebody, or you have a leak in the diaphram or hose running to it

This post has been edited by Special_Edy: May 1, 2012 - 4:44 PM

[trdproven]

Pulled the 5s throttle body and cleaned the heck out of it. Then installed new plugs.

Now idle is way up to 1200. Went back took apart the IAC and cleaned it up, and set it for lowest. Now sits at about 900-1000 RPM, not the 750 in the manual, but makes the touchy idle a little calmer. Not intended either, but works.

Double check the ignition timing, it will raise or lower the idle speed if it is not at 10° BTDC. Also check vacuum lines as a vacuum leak will raise the idle. With the engine warm not hot carefully spray starter fluid or carb cleaner around the vacuum lines and the intake, if your rpms increase more you have found the leak.

Does the idle remain the same or drop when you turn on the AC compressor? If it drops to normal rpm with the compressor on then you may likely have a bad AC idle up control valve(not to be confused with the Idle air contr valve) I had one of these go out on me.
The second idle up control valve is located behind the engine on the Power Steering Rack on the passenger side of the car. The hoses connected to this valve are prone to coming loose and falling off.

Also check that the accelerator cable has a tiny bit of slack and isnt holding the throttle open.

Once you have made sure that none of the above items is the cause you can lower the idle speed by adjusting the throttle stop screw. On the throttle body where the accelerator cable connects you will see a small diaphram that pushes the throttle open. Just inside(1/2" closer to the throttlebody) of where the tip of this acuator pushes the throttle is a second screw(mine happens to be a threaded rod with a nut). Loosen the nut and turn the threaded rod farther in till the idle drops to the correct speed. Tighten the nut and you are done.

Try this stuff out and let us know how it goes. Good luck

The idle adjustment screw is a stud and nut on my 94 GT with a 5sfe

where is this? i have not seen this, pic?

[nics]

[Special_Edy]

NOOO!!!

NO NO NO NO!

Dont touch the diaphram or the screw it pushes, its the threaded rod next to it



The red arrow points at the idle adjustment screw, the blue arrow points at the throttle opener adjustment screw(which you dont want to touch)

[Special_Edy]

Here, I made a video for you



http://www.youtube.com/watch?v=C7a0ejq5be8...eature=youtu.be

[ILoveMySilly97]

Here, I made a video for you



http://www.youtube.com/watch?v=C7a0ejq5be8...eature=youtu.be

****ing ****. Finally someone who knows what they're talking about. There's been multiple posts about adjusting our idle. Lol. Thanks a lot bro.