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

Low Idling...

Thread Tools
 
Search this Thread
 
Old Aug 7, 2010 | 11:11 PM
  #1  
darkstallion_69's Avatar
darkstallion_69
Thread Starter
Burning Brakes
 
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
Default Low Idling...

It started today. My car idles at 700-800 rpm than drops to 400-500 and after a second goes back up. Sometimes when I go to take off its doing the drop and my car wants to shut off. Any Suggestions on what is the culprit.
Reply
Old Aug 7, 2010 | 11:15 PM
  #2  
tehcarguy's Avatar
tehcarguy
Burning Brakes
 
Joined: Aug 2010
Posts: 833
Likes: 1
Default

Check the fuel pressure, it may be a clogged fuel filter/pump. I don't know exactly what it's supposed to be on LT1 engines, put I'm sure it should be above 40 psi.
Reply
Old Aug 7, 2010 | 11:23 PM
  #3  
esham's Avatar
esham
Pro
Supporting Member
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2009
Posts: 541
Likes: 60
From: Auburndale Florida 1990 Vert, 6 speed
Default

Sounds like you have an IAC problem.
Reply
Old Aug 8, 2010 | 08:32 AM
  #4  
WW7's Avatar
WW7
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Default

I would guess either a IAC problem or you have a vacuum leak, maybe one of the plastic vacuum lines broke, this happens when they get old..WW
Reply
Old Aug 8, 2010 | 02:01 PM
  #5  
darkstallion_69's Avatar
darkstallion_69
Thread Starter
Burning Brakes
 
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
Default

Originally Posted by esham
Sounds like you have an IAC problem.
wheres the iac located?
Reply
Old Aug 8, 2010 | 02:01 PM
  #6  
darkstallion_69's Avatar
darkstallion_69
Thread Starter
Burning Brakes
 
Joined: May 2009
Posts: 787
Likes: 1
From: Hialeah Florida
Default

Originally Posted by WW7
I would guess either a IAC problem or you have a vacuum leak, maybe one of the plastic vacuum lines broke, this happens when they get old..WW
The plastic lines next to the fuel rails?
Reply
Old Aug 8, 2010 | 02:03 PM
  #7  
BADDUCK's Avatar
BADDUCK
Le Mans Master
 
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Default

Originally Posted by darkstallion_69
wheres the iac located?
It screws into the throttle body on the pass side. Mine has a big squarish connector.
Reply
Old Aug 8, 2010 | 02:11 PM
  #8  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
Default

Open the throttle blades and check the tps.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-3

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Aug 9, 2010 | 05:40 PM
  #9  
JAKE's Avatar
JAKE
Le Mans Master
10 Year Member
 
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Default

Originally Posted by tehcarguy
Check the fuel pressure, it may be a clogged fuel filter/pump. I don't know exactly what it's supposed to be on LT1 engines, put I'm sure it should be above 40 psi.
41-47 psi per GM 96 Vette FSM.

Jake
Reply

Get notified of new replies

To Low Idling...





All times are GMT -4. The time now is 04:27 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE