Quick q on adjusting my idle.

[95Vert]

I have found A LOT of useful information on here about mechanically setting my idle. I will do this tonight, BUT I want to know if my "idea" will work. My car idles at about 900 with the a/c off(very stable), and about 750 with it on. I want my idle to be right around 750+/- without my a/c (love the sound of a cammed 5.0). So will I have problems keeping a steady idle with my a/c on. If if drops all the way to 600(based on current results) with it on will it die when I engage my clutch or anything?

Thanks

 

[4Jenna]

Only one way to know for sure...give it a try

 

[95Vert]

Yeah. Just wanted to see if anyone knew. Anxiety get the best of me at times. Jricher(sp?) said to set it at 600rpm and that with the iac, it will bump up to at most 650rpm. Does that sound a lil low?

 

[4Jenna]

With the Ecam it'll be close, good ole 110lsa

 

[95Vert]

Hope it'll work tho, but is 600rpm a lil low to set the idle?

 

[4Jenna]

For a aftermarket cam thats pretty low, most idle in the 800-950 range

What are you tuning with?

 

[Don 95Vert]

If you try to bypass the idle setting in the EEC, you'll get an unstable idle. With an E Cam, 800-850 is about optimal. Optimizing injector timing helps a lot too.

Once you get the commanded idle speed in the EEC, but the idle is still unsteady, here's what we recommend doing - while the engine is warm and has a stable an idle as it's going to have, unplug the IAC connector. It'll probably die or flare. Start it back up (with a buddy to hold the throttle) and adjust the throttle screw until it idles at EXACTLY the idle that's commanded in the EEC. Then disconnect the battery, clear the memory, reconnect the IAC and start it. Now you may have adjusted it too far and now the TPS will be way out of line - if you can adjust the TPS, then do it - if it's way too far out of line, then consider your TB to be junk and think about getting a new Ford TB. You can band-aid it by picking a happy medium in the throttle stop setting. Should work wonders. But you have to have the commanded idle coincide with your manual setting.

Don

 

[95Vert]

Eades, I'm not tuning with anything. I did the a9l swap to get rid of some driveability issues and have a more h/c/i friendly stock tune.

Don, thanks a lot for that info. Many people have written that the EEC will learn the new idle one has manually set it as. Since my idle is doing fine, I'm kind of nervous of messing with it and making it bad.