That is a base idle screw, your idle is controlled by the Idle Air Control Motor on top of the throttle body. That screw is to create a base idle speed that the idle drops to before the IAC takes over, screwing in will raise the idle and cause the IAC to want to close more till the PCM sees the correct idle speed, and screwing it out will lower the idle causing the IAC to open more to compensate. This can cause a unstable idle or stalling problem. There is a correct procedure for adjusting it.

 

Yes a low idle will starve the top end of oil, the oil light pressure won't always come on at a low idle because it is measuring pressure at the bottom end.

 

Your Idle Air Control is a "controlled air leak" that will change the base idle. If you try to open it up more, it won't work. The ECM will command an idle speed and the IAC will open or close to achieve it. If you push it out of adjustment, what will happen is that the ECM can no longer compensate and you can have unstable idle.

Why do you want it higher? I'd see a dealership before you screw it up.

 

I don't want it higher. I want it lower. Since I've added a free flow AC & free flowing exhaust, it seems the motor is breathing too easy & making the idle too high. It has zero lope to it. It's more of a constant purr, even @ idle. If Barry would meet me Sunday I could figure out if it's high or not!!!

 

And to add, I'm not sweatin' the low idle/low oil pressure thing. The factory has it @ 1050 +/- 50. I'm talking about making it 950. Thanks.

 

Higher or lower, perhaps you are with the AC, adding an extra "air leak" and you might need to have the ECM reset to compensate for that. You might need to get a tuner to fix it properly.

 

Didn't you add some type of auto tuner?

 

Yes. I have a Cobra PowrPro AT. But it doesn't change idle speed, it changes AFR.

 

I guess you either live with it or dump this and get a tuner like SEPST or PowerVision that CAN do everything. I am going with SEPST because the wife bought it for me or I might have gone eith PowerVision for that total adjustment ability.

 

Maybe its not changing the idle speed but while adjusting the fuel mixture...makes it idle smoother????? just a thought.