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

1994 ECM Problem

Old Jul 11, 2021 | 03:50 AM
  #1  
Daniel Juliano's Avatar
Daniel Juliano
Thread Starter
Intermediate
 
Joined: May 2020
Posts: 28
Likes: 0
From: Portland, OR
Default 1994 ECM Problem

I think the ECM in my 94 is starting to go. The LED display sometimes reads normally but other times displays complete gibberish of lines and shapes. After a while every number becomes a zero and it stays like that. Does anyone know where the ECM can be rebuilt or a working one can be found. Any help would be greatly appreciated, thanks in advance.
Reply
Old Jul 11, 2021 | 10:36 AM
  #2  
pedricd's Avatar
pedricd
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Jun 2020
Posts: 1,355
Likes: 396
From: Northwest Ohio
Default

Sounds like the dash or maybe the CCM not the ECM?

you might just have a bad ground somewhere too...
Reply
Old Jul 11, 2021 | 06:10 PM
  #3  
Daniel Juliano's Avatar
Daniel Juliano
Thread Starter
Intermediate
 
Joined: May 2020
Posts: 28
Likes: 0
From: Portland, OR
Default

I attached a video of a the dash as well as a picture of what happens after a few minutes after the car is turned on. After it spazzes out it returns to normal with the occasional hiccup.
I'll check for grounds later today as this problem seemed to develop around the same time I messed with some wires under the dash.





Attached Files
File Type: mov
IMG_1578.MOV (11.07 MB, 29 views)
Reply
Old Jul 12, 2021 | 06:45 PM
  #4  
bac22's Avatar
bac22
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 9,061
Likes: 214
From: Epping NH
Default

Originally Posted by Daniel Juliano
I'll check for grounds later today as this problem seemed to develop around the same time I messed with some wires under the dash.
Yeah I'm guessing something came lose, doubt it's the ECM or BCM. I probably would check the wires you were messing with and unplug/replug in the the various connectors you come across.
Reply
Old Jul 12, 2021 | 07:06 PM
  #5  
Kevova's Avatar
Kevova
Le Mans Master
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Default

Codes? Modules normally set communication or data codes when they cause send or receive faulty data. Batee.com has information regarding clusters.
Reply
Old Jul 13, 2021 | 02:22 AM
  #6  
Daniel Juliano's Avatar
Daniel Juliano
Thread Starter
Intermediate
 
Joined: May 2020
Posts: 28
Likes: 0
From: Portland, OR
Default

So it turns out it was just some loose connections. I literally kicked the wires under the dash and now everything is working fine. Thank you all for the help, I appreciate it.
Reply

Get notified of new replies

To 1994 ECM Problem



Thread Tools
Search this Thread

All times are GMT -4. The time now is 12:07 AM.

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