2.4 SS SC

I have an automatic 2.4L cobalt SS that i supercharged and it does not want to cooperate. Overall the car runs good but I keep getting a high idle and I am stumped at how to fix it. On cold starts it idles fine. However if I go on the highway or drive it for 20 mins or longer it goes to high idling. I have tried flashing ecm and reflashing tune and doing a throttle relearn and been through about five throttle bodies and don't know what else to do. Please Help!

chevygirl2006

Mine did the same thing. Was just the throttle settings in the tune.

2.4 SS SC

I had my tuner look for anything wrong already and he didn't find anything. But I'll ask him again. Do you know why it would only high idle when it's warm?

chevygirl2006

I'll have to ask my tuner how he fixed mine. We couldn't figure it out for the longest time. He somehow made the idle drop.

2.4 SS SC

That would be awesome. I'm still working with my tuner to find the problem

chevygirl2006

Go to hp tuner and go to engine then idle tab and then go to the throttle body scaler and find the minimum and max. Try setting max to 40 and min 30. Try that and if it still doesn't work mess around with those numbers.

Also, how high is it idling?

2.4 SS SC

I'll try that when I get a chance next. And 2k in park and in drive is approximately at 1250

chevygirl2006

Mine would idle at 3k in park

chevygirl2006

Any update?

2.4 SS SC

I have gotten super busy with college term ending and the person locally who puts the tunes on sent from my tuner hasn't had time. Will post when I upload the new tune from my tuner and if that doesn't fix it then play with the idle numbers like you specified. Thanks for the help!

2.4 SS SC

UPDATE: I tried the new tune from my tuner and it went down to 1500: he had the throttle max at 150. I gave him what you said at min and Max and he thinks 75 for max will get mine set right to idle at 750.

chevygirl2006

Awesome. Just keep messing with those 2 numbers. I think mine is set at 40 and 30. Idles at 800-900