1989 Corvette Help
Thread Starter
Cruising
Joined: Jan 2011
Posts: 13
Likes: 1
From: Warner Robins GA
1989 Corvette Help
Need some help. When driving my corvette will just shut off and start right back up. I replaced fuel injectors, EGR valve, fuel pressure regulator, all relays, fuel pump and filter, IAC, TPS, all the other sensors except the Knock sensor, new wires, spark plugs, distributor cap, O2 sensor, etc. Car starts right up all the time, just hit the key. Car has original computer and replacement clip. Also the car has a new alternator.
If anyone can help on this issue, I would really appreciate your input.
If anyone can help on this issue, I would really appreciate your input.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
This would be my guess also.. The ICM is usually temperture sensative and will start causing problems after the car reaches running temperture. It usually causes the car to shut off like someone through a switch, but then will start right up...If its not the ICM have the coil checked ,this can cause it to cut out also, but when mine went out it wouldn't start right back up till it cooled off...But, Before doing anything else I would check for codes.....WW
Last edited by WW7; Aug 23, 2011 at 07:08 PM.
Thread Starter
Cruising
Joined: Jan 2011
Posts: 13
Likes: 1
From: Warner Robins GA
This would be my guess also.. The ICM is usually temperture sensative and will start causing problems after the car reaches running temperture. It usually causes the car to shut off like someone through a switch, but then will start right up...If its not the ICM have the coil checked ,this can cause it to cut out also, but when mine went out it wouldn't start right back up till it cooled off...But, Before doing anything else I would check for codes.....WW
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
The ignition control module is in the distributor cap. I believe replacements can be found at your local auto parts store.
Look for this inside the distributor cap....
Check all the wires/connectors in that area. Could have an intermittent connector. Check all wires inside with volt/ohm meter and wiggle while doing so.
Also could have a break in the dizzy reference wire...loose connector at the MAF...or faulty ECM.
Try cleaning and putting dialectic grease on the MAF connections first (just under the rear of the MAF). The ICM would be my next guess. ECM's used to be available rebuilt from NAPA. Don't know anymore.
Also, have heard some mention of faulty injector drivers but haven't learned where that's located or if it can be intermittent.
Look for this inside the distributor cap....
Check all the wires/connectors in that area. Could have an intermittent connector. Check all wires inside with volt/ohm meter and wiggle while doing so.
Also could have a break in the dizzy reference wire...loose connector at the MAF...or faulty ECM.
Try cleaning and putting dialectic grease on the MAF connections first (just under the rear of the MAF). The ICM would be my next guess. ECM's used to be available rebuilt from NAPA. Don't know anymore.
Also, have heard some mention of faulty injector drivers but haven't learned where that's located or if it can be intermittent.
Last edited by GREGGPENN; Aug 23, 2011 at 11:42 PM.
- 1986 Original Owner -
Joined: Apr 1999
Posts: 3,193
Likes: 139
From: North Yorkshire, England
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In VII Veteran
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
