i need to know if the big screw under the cover bracket on the throttle body is an idle adjustment screw ...this car is a 90 legacy 2.2 AWD A/T.....any help would be nice..thanks 90rulegacy

Those are idle stop screws. they are preset from the factory and should not be touched.

 

The idle is controlled by the computer via the idle air control valve. So depending on what problems your seeing, you may want to look at that?

 

So....what problems are you having?

Correct. Don't touch it, you have absolutely no reason to. Even if your idle is low and you're looking to raise it, the ECU will just recognize that and adjust the IAC valve to compensate.

 

Back when I was stupid and didn't know what I was doing with the car, I tightened that screw down so much I broke the head off of it. The remnant of that screw is sitting in my throttle body right now as we speak, completely misadjusted, which is why my idle is still erratic. That broken screw is near impossible to reach, I'm pondering removing the throttle body entirely and taking it to the dealer to have them flow test it in order to set a new screw in there at factory location.

 

You probably have an IAC problem of some sort.

dealer won't be able to flow test anything.....they'll just say get a new Tb.....which is a better way to go....you should be able to find one used.....hell I think i've got a couple layin around.

after i replaced a injector my idle went below 500 rpm , no stalling just a very low idle.It has new spark plugs, wires..the car has 164,000 miles on it , and other then a very low idle it runs great.....?????? i dont know...any thoughts????

reset the ECU.

 

If you were driving with a bum injector for a while, the ECU adjusted the duty cylce to compensate for that injector. When you replace it....the ECU has to relearn to compensate back to normal. It's faster simply to reset the ECU....have it go back to stock maps and relearn fully functional sensors/equipment.

reset the ECU.

 

If you were driving with a bum injector for a while, the ECU adjusted the duty cylce to compensate for that injector. When you replace it....the ECU has to relearn to compensate back to normal. It's faster simply to reset the ECU....have it go back to stock maps and relearn fully functional sensors/equipment.

 

what would be the way to reset the ecu?

the idea on my 94 legacy is erratic and if i come to a stop real quick,it seems to come close to stalling.

my legacy has also just started idling at around 500 rpm's. so deatiles on how to reset the ECU would be appreciated.

take the positive battery cable off for like an hour or two, you will have to reset your stereo settings and such, that is the easiest way that i have heard of.

 

 

 

 

~Josh~

Pull fuse 14 EGI/TCU for an hour. It's easier and doesn't screw with the radio settings.

 

Some say you need to let the car warm up/idle for like 10-15 minutes or until warmed up. However I think you can probably do without. I didn't do it the last time I had my battery out.