Some insight would be great...
Thread Starter
Teching In
Joined: May 2006
Posts: 18
Likes: 0
Some insight would be great... I have an '06 MN6 Corvette with the following mods: FAST and LPE intakes, a medium size cam, kooks Lt headers with cats and x-pipe, and it has been tuned following each installation of mods. My idle at start up is fine and cruising is great, no issues there. The issue begins when the car stops. As soon as the wheels stop, the idle screams to 2k rpms and stays there. If I tap the gas, it may come back down to 1500 or it may choose to stay there. My gas mileage doesn't seem to be bad and all readings are in line. It has been thoroughly checked for vacuum leaks and there are none. The IAC valve is good. The MAF is okay. The problem began several days after the cam install and before the intakes were installed. I disconnected the battery and everything was fine with no surging, etc. for 2 days after which the problem returned. I love the performance of the car and would like to get this resolved. Has anyone experienced anything like this? My tuner as well as myself is searching to find out what the heck is going on. Any input would be appreciated. It's driving me nuts. All the kids on Honda Civics think I want to race when I am stopped at a light. Yesterday, this kid on a Contour [Ford?] pulled up beside me at a light and asked if I wanted to race. I shook my head and said to myself, "This has to end." 
It sounds like your throttle cracker and throttle follower decay rates are are too long. I would have your tuner start there. I would also advise you to look into purchasing your own tuning suite so you are not at the mercy of a tuner to get your drivability right. Check out www.greenlightmotorsports.com for some great deals on www.efilive.com
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
Originally Posted by TAQuickness
It sounds like your throttle cracker and throttle follower decay rates are are too long.
It sounds like your base airflow (RAF) may be off too. Once the car has the couple days to learn the new idle characteristics, the problem reappears. I didn't realize electronic throttle cars had an IAC valve though...
Once you dial in base airflow, the throttle cracker and follower tables (both volumes and decay rates) can be tweaked as stated above and you should be good. But keep in mind, they aren't the only tables that add airflow to the base airflow table. A thorough tuner should know this already...
Once you dial in base airflow, the throttle cracker and follower tables (both volumes and decay rates) can be tweaked as stated above and you should be good. But keep in mind, they aren't the only tables that add airflow to the base airflow table. A thorough tuner should know this already...
Launching!
Joined: May 2003
Posts: 290
Likes: 0
From: Canadian West Coast
Originally Posted by SSpdDmon
I didn't realize electronic throttle cars had an IAC valve though...
Thread Starter
Teching In
Joined: May 2006
Posts: 18
Likes: 0
Originally Posted by TAQuickness
On ETC, the IAC is controled with the throttle plate.
Well, I have some news. I had not turned my a/c on at all until today and the problem totally goes away with the a/c on. The car runs and idles perfectly. Turn the a/c off, and it returns. So, I will leave the a/c on and hope that it gets figured out before winter.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
