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

No start 1986

Thread Tools
 
Search this Thread
 
Old Jul 4, 2012 | 04:21 PM
  #1  
abdo's Avatar
abdo
Thread Starter
Drifting
15 Year Member
 
Joined: Oct 2001
Posts: 1,770
Likes: 33
From: Cohasset MN
2017 Corvette of the Year Finalist
2016 C1 of Year Finalist
Default No start 1986

Went to a 4th of July parade today with my '86 Coupe. On the way home I stopped at a friend's place for a few minutes. Turned the key - no start, not even a click. All the lights worked. Borrowed a socket wrench from the friend and took off the negative terminal. Rubbed the surfaces a little with my fingers and put it back on. Turned the key and it started just fine.
This Spring, I cleaned both terminals good. I am puzzled as to why corrosion could form so quickly after only two months.
I posted this just so you can check this if you have a no start condition for no apparent reason.
Reply
Old Jul 4, 2012 | 05:55 PM
  #2  
joe paco's Avatar
joe paco
Burning Brakes
 
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Default

did that the first time my 91 didn't click. it was the key, didn't read for unknown reasons. it resets in 4 mins, so by the time I unhooked terminal, it was ready.

next time look for a steady SECURITY light when you turn key to run. if you have it, remove key and wait for 4 mins. unless you noticed obvious corrosion. my terminals were clean.
Reply
Old Jul 4, 2012 | 06:21 PM
  #3  
abdo's Avatar
abdo
Thread Starter
Drifting
15 Year Member
 
Joined: Oct 2001
Posts: 1,770
Likes: 33
From: Cohasset MN
2017 Corvette of the Year Finalist
2016 C1 of Year Finalist
Default

Some years ago when I had trouble with the ignition not reading the code on the key, I installed a bypass to eliminate the problem. I tend to think it was still a battery connection corrosion problem. I had waited well over 4 minutes after trying to start it today.
Reply
Old Jul 5, 2012 | 01:18 AM
  #4  
Cliff Harris's Avatar
Cliff Harris
Race Director
15 Year Member
 
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Default

The early VATS system does not have a connection to the security light. Later GM moved the VATS function from a separate module to inside the ECM and those are the ones that tell you there is a VATS problem by lighting the security light.
Reply
Old Jul 5, 2012 | 04:04 AM
  #5  
rodj's Avatar
rodj
Le Mans Master
25 Year Member
 
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Default

Originally Posted by Cliff Harris
Later GM moved the VATS function from a separate module to inside the ECM .
Later models ('90+ ) have the VATS incorporated in the CCM ; not the ECM.
All the ECM /PCM ever has is a fuel enable signal requirement from VATS in order for it to fire the injectors
Reply
Old Jul 5, 2012 | 07:38 AM
  #6  
joe paco's Avatar
joe paco
Burning Brakes
 
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
Default

Originally Posted by Cliff Harris
The early VATS system does not have a connection to the security light. Later GM moved the VATS function from a separate module to inside the ECM and those are the ones that tell you there is a VATS problem by lighting the security light.
thanks. this is why I normally stick to the 91 year models when I get involved. too many differences in years. besides, he has the vats bypass.

I've never experienced where wiping a visably clean terminal solved a problem but is possible. if the connection is made to the solenoid when cranked, but battery weak, lights should dim or go out, relays click, etc.

joe
Reply

Get notified of new replies

To No start 1986





All times are GMT -4. The time now is 06:17 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