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

limp home mode

Thread Tools
 
Search this Thread
 
Old Sep 12, 2006 | 08:52 PM
  #1  
wjmac40's Avatar
wjmac40
Thread Starter
Intermediate
 
Joined: May 2006
Posts: 38
Likes: 0
From: Gilbert Az
Default limp home mode

Car has gone into limp home mode again
Had issues with MAS in past however this seems different
Question is I put a timing light under this rough idle and it's miss firing to the point it fires now and then.
Is this the way limp home mode works or do I have another problem?
It's a 1989 and it is blowing black smoke and using fuel at an incredable rate.surging at any speed,and not holding an idle.The light is showing up before the timing plate and only firing now and then

Last edited by wjmac40; Sep 12, 2006 at 10:05 PM.
Reply
Old Sep 12, 2006 | 10:11 PM
  #2  
vader86's Avatar
vader86
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 62,145
Likes: 1,730
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Default

What code is showing?
Reply
Old Sep 12, 2006 | 10:21 PM
  #3  
wjmac40's Avatar
wjmac40
Thread Starter
Intermediate
 
Joined: May 2006
Posts: 38
Likes: 0
From: Gilbert Az
Default

Thats the thing ,I'm getting no code at this point
Reply
Old Sep 13, 2006 | 09:45 AM
  #4  
rick lambert's Avatar
rick lambert
Le Mans Master
10 Year Member
 
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Default

I'd start with a fuel pressure test..could be you have some bad injectors. Next I'd pull the ICM and have Autozone check it....while it's out Ohm your pickup coil.
Reply
Old Sep 13, 2006 | 10:00 AM
  #5  
jmrl98's Avatar
jmrl98
Drifting
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: May 2002
Posts: 1,509
Likes: 3
From: Hazel Park MI
Default

I would think if it's truly limp home mode, you'd have a code stored. Fuel or spark is a good place to start, as suggested by Rick.
Reply
Old Sep 13, 2006 | 05:39 PM
  #6  
Snakecharmer383's Avatar
Snakecharmer383
Melting Slicks
20 Year Member
Photoriffic
Liked
Loved
 
Joined: May 2004
Posts: 2,856
Likes: 187
From: Earth
Default

I had some similar problems with my 89. I wasn't getting any codes either, finally when I unhooked the scan tool and rehooked it up I got a Code 43 (think it was 43) which is the EST (electronic spark timing) I replaced the module and all was fine. I would also check the knock senor.
Reply
Old Sep 14, 2006 | 12:15 AM
  #7  
SSLT1KID's Avatar
SSLT1KID
Racer
10 Year Member
 
Joined: Aug 2002
Posts: 432
Likes: 0
From: Lancaster CA
Default

did you try disconnecting the battery to see if it comes back? how do you know it is in limp home mode?

Shawn
Reply

Get notified of new replies

To limp home mode





All times are GMT -4. The time now is 05:41 AM.

story-0
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-1
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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