CorvetteForum - Chevrolet Corvette Forum Discussion

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

CODES 23 and 34

Thread Tools
 
Search this Thread
 
Old Feb 24, 2014 | 07:16 AM
Share
  #1  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default CODES 23 and 34
I have the 1985 vet out this weekend and I was sitting at a light and noticed that the service eng light was on. I checked the codes and I got 23 and 34. im sure someone here will same me a lot of time and money in parts. im almost sure is going to be one of three parts Mass airflow sensor, TPS, or intake temo sensor.


Thank you
Reply
0
Old Feb 24, 2014 | 10:22 AM
Share
  #2  
vader86's Avatar
vader86
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Default
http://members.shaw.ca/corvette86/Code%2023.pdf

http://members.shaw.ca/corvette86/Code%2034.pdf

Fix the 34 first, I'd imagine the 23 will disappear after that.
Reply
0
Old Feb 24, 2014 | 10:40 AM
Share
  #3  
tunedport85inject's Avatar
tunedport85inject
Drifting
10 Year Member
 
Joined: Aug 2010
Posts: 1,704
Likes: 8
Default
i hope your MAF is good...anyway ceck the maf power relais/connector,and the signal terminal 998/ dk green to terminal b12 on ecm connector for short to ground or bad contact...
Reply
0
Old Feb 24, 2014 | 11:11 AM
Share
  #4  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
Can a auto parts store check the mass airflow sensor on a machine like they do with say a ignition module?
Reply
0
Old Feb 24, 2014 | 11:19 AM
Share
  #5  
tunedport85inject's Avatar
tunedport85inject
Drifting
10 Year Member
 
Joined: Aug 2010
Posts: 1,704
Likes: 8
Default
btw testing on car is easy,just read the pdf code 34,just 2 trial with maf connected and disconnected ,if you result in a 33 code you have a faulty maf...
Reply
0
Old Feb 24, 2014 | 12:47 PM
Share
  #6  
vader86's Avatar
vader86
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Default
Originally Posted by paintball2000
Can a auto parts store check the mass airflow sensor on a machine like they do with say a ignition module?
No they won't know, You need to be able to check this one
Reply
0
Old Feb 24, 2014 | 12:52 PM
Share
  #7  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
I am at work right now but when I get home I will try it. I have a feeling the mad is bad because the silicone gasket on the body is peeling and its not like gm cars aren't know to eat them like candy.
Reply
0
Old Feb 25, 2014 | 12:38 AM
Share
  #8  
Cliff Harris's Avatar
Cliff Harris
Race Director
15 Year Member
 
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Default
'85s don't have MAF power and burnoff relays, as shown in the link.

They have a MAF burnoff module. It has one relay in it that does both the power and burnoff functions. That might affect the troubleshooting process...
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

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

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

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

 Michael S. Palmer
story-7

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

 Joe Kucinski
story-8

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

 Joe Kucinski
story-9

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

 Verdad Gallardo
Old Feb 25, 2014 | 05:46 AM
Share
  #9  
tunedport85inject's Avatar
tunedport85inject
Drifting
10 Year Member
 
Joined: Aug 2010
Posts: 1,704
Likes: 8
Default
Sorry, i miss you've an 85...i know, it's a different animal,i've one too...
Reply
0
Old Feb 25, 2014 | 09:11 AM
Share
  #10  
vader86's Avatar
vader86
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Default
Yes and the module is buried inside the dash, but studying the procedure should show to eliminate one culprit.
Reply
0
Old Apr 6, 2014 | 12:41 PM
Share
  #11  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
I replaced the MAF and i still have the codes. Yes i cleared the codes and they came back. what is the next step to take on this one?
Reply
0
Old Apr 6, 2014 | 12:59 PM
Share
  #12  
tunedport85inject's Avatar
tunedport85inject
Drifting
10 Year Member
 
Joined: Aug 2010
Posts: 1,704
Likes: 8
Default
i've seen the other thread you open where you talk about 23- 32,do you still have code 34 or was it cleared ?

if not you have still code 23-32-34,even after replacing the MAF ,do you confirm?

if you solved the 34 code with new maf,then yo still have 23-32 codes.

code 32 is a EGR system failure

code 23 is manifold air temperature (mat sensor) signal voltage high.

i'll post some pics from my 85 FSM

http://i809.photobucket.com/albums/z...ps83af9db5.jpg
http://i809.photobucket.com/albums/z...ps1ca10dd9.jpg
http://i809.photobucket.com/albums/z...psadaeb651.jpg
http://i809.photobucket.com/albums/z...psd9a49279.jpg
http://i809.photobucket.com/albums/z...psd47a32ae.jpg
http://i809.photobucket.com/albums/z...psd1a70da5.jpg
http://i809.photobucket.com/albums/z...ps7775b088.jpg
Last edited by tunedport85inject; Apr 6, 2014 at 01:42 PM.
Reply
0
Old Apr 6, 2014 | 01:30 PM
Share
  #13  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
i just disconnected the MAF and ran the car at at 2000 and it gave me a code 33 does that mean i got a bad MAF from supply ?
Reply
0
Old Apr 6, 2014 | 01:31 PM
Share
  #14  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
if i connect the MAF and run the car normally i get code 23 and 32. most likely its my EGR?
Reply
0
Old Apr 6, 2014 | 01:45 PM
Share
  #15  
tunedport85inject's Avatar
tunedport85inject
Drifting
10 Year Member
 
Joined: Aug 2010
Posts: 1,704
Likes: 8
Default
For some reason photobucket gives my pics upside down,save them and rotate using windows app.Its a 85' FSM.
Reply
0
Old Apr 6, 2014 | 01:49 PM
Share
  #16  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
if i get a vacuum pump i should be able to see if its moving and if its holding vacuum correct?
Reply
0
Old Apr 6, 2014 | 03:02 PM
Share
  #17  
paintball2000's Avatar
paintball2000
Thread Starter
Advanced
 
Joined: Dec 2013
Posts: 74
Likes: 0
Default
I got the vacume tester and went to pump it down and well it wouldn't pump down ....probly a bad diafram...should I do the fuel pressure reg when I pull the plentim off again ?
Reply
0
Old Apr 6, 2014 | 03:34 PM
Share
  #18  
DanielRicany's Avatar
DanielRicany
Melting Slicks
 
Joined: Jun 2013
Posts: 3,065
Likes: 39
Default
I Think Your Egr Valve Is Stuck Open.
Reply
0

Get notified of new replies

To CODES 23 and 34

Back to Subforum
C4 Tech/Performance
View Next Unread
Replacing 92 LT-1 engine timing chain cover gasket and oil pan gasket




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 06:19 PM.

story-0
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-1
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-2
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-3
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
story-4
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-5
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-6
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-7
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-8
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-9
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