C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Poor idle after header install

Old Feb 26, 2009 | 09:12 PM
  #1  
tarheelracer's Avatar
tarheelracer
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Apr 2002
Posts: 3,305
Likes: 2
From: Havelock NC
Default Poor idle after header install

Car is a '92. When the motor is cold and I crank it, the car wants to idle at 3 to 400 and I have to give it gas to keep it alive. The car continues to run like this until I turn the motor off. If the engine is warm when I crank it, the car runs great. This only started happening after I installed my headers, removed A.I.R. and EGR. There are no codes other than the emissions codes. I thought maybe the IAC....Thanks for the help.
Reply
Old Feb 26, 2009 | 09:38 PM
  #2  
engle1147's Avatar
engle1147
Le Mans Master
Supporting Lifetime
 
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Default

Maybe rest the ECM.
Reply
Old Feb 26, 2009 | 09:54 PM
  #3  
Demonic85's Avatar
Demonic85
Team Owner
 
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Default

The loss of EGR is causing it. The EGR is computer controlled and without it, you'll have issues. Either put it back on or have your computer tuned for no EGR.
Reply
Old Feb 27, 2009 | 10:13 AM
  #4  
tarheelracer's Avatar
tarheelracer
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Apr 2002
Posts: 3,305
Likes: 2
From: Havelock NC
Default

Originally Posted by Demonic85
The loss of EGR is causing it. The EGR is computer controlled and without it, you'll have issues. Either put it back on or have your computer tuned for no EGR.
Thanks, just ordered a new tune from PCM's.
Reply

Get notified of new replies

To Poor idle after header install



Thread Tools
Search this Thread

All times are GMT -4. The time now is 07:34 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE