Idle problem
Thread Starter
Racer
Joined: May 2006
Posts: 378
Likes: 11
From: DeBary Fl.
Idle problem
2005 6 speed with headers and an open air box otherwise stock. Recently my idle does not decrease as quickly as it should rev it up to quick rev to 2000 or so and slowly drops back down to 8 or 900 rather than dropping quickly otherwise running fine but this can be annoying in traffic! Any thoughts on what this could be it just came out of nowhere no changes no codes, any thoughts or suggestions would be appreciated
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
2005 6 speed with headers and an open air box otherwise stock. Recently my idle does not decrease as quickly as it should rev it up to quick rev to 2000 or so and slowly drops back down to 8 or 900 rather than dropping quickly otherwise running fine but this can be annoying in traffic! Any thoughts on what this could be it just came out of nowhere no changes no codes, any thoughts or suggestions would be appreciated
Last edited by C5 Diag; May 5, 2024 at 03:01 PM.
Drifting
Joined: Apr 2021
Posts: 1,928
Likes: 1,125
From: Peoria, AZ
2023 C6 of the Year Finalist - Modified
I have the exact same problem.......cleaned the MAF sensor, and TB, even replaced the MAF sensor AND the TB.....still does the same thing. SC'd LS7, ported and polished heads, Belanger Custom Tri-Y Headers........I just "put up with it" however it is annoying. I took it to the dyno AGAIN and the tuner has no idea why it's happening.
Any suggestions would be appreciated.....
Any suggestions would be appreciated.....
Melting Slicks
Joined: Oct 2022
Posts: 3,301
Likes: 1,892
From: Ulta Vista, AZ
Typically in other cars I have experienced this, it is IACV problems, specifically the decay rate.
Not sure if these cars even have an iacv, but if so, I’d check that out and clean it out. They can get gummed up over the years.
Not sure if these cars even have an iacv, but if so, I’d check that out and clean it out. They can get gummed up over the years.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
Melting Slicks
Joined: Nov 2009
Posts: 3,293
Likes: 1,149
From: Klein TX
2023 C6 of the Year Finalist - Unmodified
2022 C6 of the Year Finalist - Unmodified
I have the exact same problem.......cleaned the MAF sensor, and TB, even replaced the MAF sensor AND the TB.....still does the same thing. SC'd LS7, ported and polished heads, Belanger Custom Tri-Y Headers........I just "put up with it" however it is annoying. I took it to the dyno AGAIN and the tuner has no idea why it's happening.
Any suggestions would be appreciated.....
Any suggestions would be appreciated.....
If he gives you a blank look, find another "tooner" .
According to the OP, his problem occurred suddenly. The idle hang in this case will most likely be caused by a mechanical problem like a sticking throttle butterfly or a vacuum leak, because tunes don't just spontaneously change.
Good luck to both you guys, let us know what the fix is when you find it.
Last edited by wjnjr; May 8, 2024 at 12:22 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Thread Starter
Racer
Joined: May 2006
Posts: 378
Likes: 11
From: DeBary Fl.
Thanks to all replies!!!!!!!!
I have pulled the entire air intake off & cleaned the throttle body then pulled neg bat cable, yet no change???? It simply will not drop back to IDLE after shifts or just after revs ??? ANY thoughts ??
Thanks in advance....................
I have pulled the entire air intake off & cleaned the throttle body then pulled neg bat cable, yet no change???? It simply will not drop back to IDLE after shifts or just after revs ??? ANY thoughts ??
Thanks in advance....................
Melting Slicks
Joined: Nov 2009
Posts: 3,293
Likes: 1,149
From: Klein TX
2023 C6 of the Year Finalist - Unmodified
2022 C6 of the Year Finalist - Unmodified
1) If the problem has existed since the car was modified, then something in the modifications caused it. Look for a vacuum leak and/or a bogus "toon".
Or,
2) If the car was running fine since the mods, and the problem just appeared, not coincident with work on the car, then suspect a sticking throttle body or a vacuum leak.
Or,
2) If the car was running fine since the mods, and the problem just appeared, not coincident with work on the car, then suspect a sticking throttle body or a vacuum leak.
Thread Starter
Racer
Joined: May 2006
Posts: 378
Likes: 11
From: DeBary Fl.
I will check for vacuum leak, but just for the thought....I had added a filter to my catch can which i''m not sure of the benefits?? I will let all know as I have removed the filter , pulled neg cable just in case and we will see????
Race Director
Joined: Mar 2010
Posts: 15,988
Likes: 817
This is not the Corvette ownership experience we strive for. Our team would like the opportunity to learn more about the idle on your C6 and investigate ways we can potentially assist. When you get the chance, please send us an email to socialmedia@gm.com. Be sure to include your Username and Forum name in the subject line, then provide additional details about your experience in the body of the email. We look forward to your contact.
Melting Slicks
Joined: Nov 2009
Posts: 3,293
Likes: 1,149
From: Klein TX
2023 C6 of the Year Finalist - Unmodified
2022 C6 of the Year Finalist - Unmodified
Picture of me tuning a carburetor back in the day.
Melting Slicks
Joined: Nov 2009
Posts: 3,293
Likes: 1,149
From: Klein TX
2023 C6 of the Year Finalist - Unmodified
2022 C6 of the Year Finalist - Unmodified
Great, glad you found the problem and it was something simple,
Seriously, to learn all about PCV systems and catch cans, go to : http://www.mightymousesolutions.com/
Mr, Mighty Mouse is very helpful whether you're a customer or not.
Just beware of our own self-appointed world's greatest tuner & PCV expert catch can ****. He usually shows up when people start talking about catch cans.
Seriously, to learn all about PCV systems and catch cans, go to : http://www.mightymousesolutions.com/
Mr, Mighty Mouse is very helpful whether you're a customer or not.
Just beware of our own self-appointed world's greatest tuner & PCV expert catch can ****. He usually shows up when people start talking about catch cans.