Is this a tuning problem
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,056
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From: monroe city mo
Is this a tuning problem
I had heads and cam installed a few months ago, they also tuned it. When im not running the AC and pull up to a stop, it idles down to 1000 rpms and after 30 seconds or so it will drop to 800 rpm. Which is fine. Now, when the AC is on and i pull up to stop it idles up to 2000 rpms and stays there for a couple of minutes before it drops to 1000 rpms. Can someone give me an idea as to whats going on. Thanks guys
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,056
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From: monroe city mo
I called them and told them the problem with the idle with the air on. He said he had never heard of that before but i could bring the car back and he would check it out. The problem is they are 5 hours away.I asked them when we were discussing them doing the work if the tune would be done right the first time because of the distance between us, said it wouldnt be a problem.
Drifting
Joined: Mar 2005
Posts: 1,589
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From: St. Louis MO
St. Jude Donor '06-'07
I can't help with what is wrong, but I would find out before the trip to have a good ideal what needs to be done. I could see you wasting a lot of time and not getting it fixed. I am sure someone here will be able to help. Good luck. 
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,056
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From: monroe city mo
Thanks,i hope someone has an idea of whats wrong.
Pro
Joined: Dec 2004
Posts: 681
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From: The Woodlands TX
I had heads and cam installed a few months ago, they also tuned it. When im not running the AC and pull up to a stop, it idles down to 1000 rpms and after 30 seconds or so it will drop to 800 rpm. Which is fine. Now, when the AC is on and i pull up to stop it idles up to 2000 rpms and stays there for a couple of minutes before it drops to 1000 rpms. Can someone give me an idea as to whats going on. Thanks guys
Wow, I figured mine was the only one doing this. I'll idle at 1500 with the AC on, and it won't drop until I turn it (the AC) off. I'll be watching to see what your tuner says. (Just another example why this Forum is a great place!) Good luck!
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,056
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From: monroe city mo
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Team Owner
Joined: May 2003
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From: East Meadow NY
St. Jude Donor '12
I had issues similar to that with my initial H/C tune where the idle wouldn't always drop right away. Go back and have them fix it. I understand the distance is a pain, but they are going to fix it for you.
Supporting Tuner
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Melting Slicks
Joined: Jul 2006
Posts: 3,356
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From: Chesapeake Va
Expected Idle airflow for one. Needs to match the actual, at least be close. Depending on the cam, sometimes you have to adjust the ETC scalar.
You also need to make sure that the commanded A/F ratio matches the actual. Theres a couple/few other things that need to be right/corrected/modified. but I dont have my software in front of me.
Its about 3 AM. I'M IN GERMANY!!!!
Pro
Joined: Aug 2004
Posts: 575
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From: Richmond Hill Ontario
It's definitely in the tune. There are several tables that need to be adjusted to get it to idle properly as well as drop to idle speed right away when you come to a stop. I think you will have no choice but to take it back to the tuner. DO you know what tuning software he's using? If you can get a copy of your tune maybe someone with the same software can look at your tune and check the tables that need to be worked on before you drive 5 hours. I'm sure someone on the scan & tune forum here would then be able to help you. If not you can go to LS1 Tech forum for help or the software vendors site. You'll probably need to get a list with details on the mods you've done (cam specs, exhaust, intake, etc).
Thread Starter
Melting Slicks
Joined: Jan 2003
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From: monroe city mo
The problem i have with taking back,beside the 10 hour drive is,will he get it right this time. Everyone here knows its a tuning problem,but i tell the guy that tuned it,and he says he has never heard of that happening before. Kind of makes me a little leary of his knowledge.
Seems like everyone you talk to has the best tuner in the world.
Seems like everyone you talk to has the best tuner in the world.
Safety Car
Joined: Jun 2005
Posts: 4,977
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From: St. Louis Missouri
I'm in St. Louis and tune with HP Tuners but I don't have support for 02 Vette. I have a friend that does though. One of us can help you out. I'm not sure where Monroe, MO is though? KC side?
[Edit]I see you're up north near Hannibal. That's not too bad of a drive.[/edit]
[Edit]I see you're up north near Hannibal. That's not too bad of a drive.[/edit]
Melting Slicks
Joined: Jul 2006
Posts: 3,356
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From: Chesapeake Va
Its these changes, that improve, or maintain the driveability quality after cam swaps, that make or break a tuner.