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

85 Timing

Thread Tools
 
Search this Thread
 
Old May 13, 2007 | 08:39 PM
  #1  
klkordzi's Avatar
klkordzi
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 161
Likes: 0
From: Pittsburgh Penna.
Default 85 Timing

My 85 is stock*as far as I know) and is running rough. I know I have a problem with the fuel vapor canister purge valve solenoid. I want to check the timing. What is the proceedure for doing this. The FSM says to look at the emissions sticker but ut is missing. Also, what does the connetion by the brake booster that I need to disconnect look like?
Reply
Old May 13, 2007 | 10:14 PM
  #2  
vinnies87's Avatar
vinnies87
Le Mans Master
 
Joined: Aug 2003
Posts: 9,884
Likes: 3
From: Magnolia Mississippi
St. Jude '03-'04-'05-'06-'07
Default

EST connector is a plastic connect - wire is tan/blk, unhook to set timing. If you search, there are posts that show location, but its by the wiring harness near the brake booster...Time 6* BTDC.
Reply
Old May 14, 2007 | 10:12 PM
  #3  
klkordzi's Avatar
klkordzi
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 161
Likes: 0
From: Pittsburgh Penna.
Default

Thanks
Reply
Old May 15, 2007 | 12:42 AM
  #4  
RRT vette's Avatar
RRT vette
Le Mans Master
15 Year Member
 
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Default

This thread might be useful.

http://forums.corvetteforum.com/show....php?t=1536382
Reply
Old May 15, 2007 | 12:56 AM
  #5  
Demonic85's Avatar
Demonic85
Team Owner
 
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Default

I thought it was 10* BTDC, either way I know its printed on the emissions label on the radiator shroud.
Reply
Old May 15, 2007 | 01:37 AM
  #6  
RRT vette's Avatar
RRT vette
Le Mans Master
15 Year Member
 
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Default

The base timing is 6* BTDC. I have advaced mine to 10* BTDC with minimal knock.
Reply
Old May 15, 2007 | 11:33 AM
  #7  
CFI-EFI's Avatar
CFI-EFI
Race Director
10 Year Member
 
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Default

Originally Posted by 4Ever21
I thought it was 10* BTDC, either way I know its printed on the emissions label on the radiator shroud.
Originally Posted by klkordzi
The FSM says to look at the emissions sticker but ut is missing.
All C4s on which the timing CAN be set, L83s and L98s, the spec for the base timing is 6° BTDC. Also, your FSM has an illustration of the EST connector that must be unplugged.

RACE ON!!!
Reply
Old May 16, 2007 | 08:27 PM
  #8  
klkordzi's Avatar
klkordzi
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 161
Likes: 0
From: Pittsburgh Penna.
Default

Thanks everyone
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

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

 Joe Kucinski
story-1

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

 Joe Kucinski
story-2

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

 Verdad Gallardo
story-3

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-4

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-5

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-6

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-7

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-8

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-9

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
Old May 16, 2007 | 08:31 PM
  #9  
Demonic85's Avatar
Demonic85
Team Owner
 
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Default

I double checked it and it is 6* BTDC, my bad. Just dont go higher than 12* it'll start running bad.
Reply
Old May 18, 2007 | 10:08 PM
  #10  
klkordzi's Avatar
klkordzi
Thread Starter
Instructor
10 Year Member
 
Joined: Nov 2005
Posts: 161
Likes: 0
From: Pittsburgh Penna.
Default

CFI-EFI: Where is the illustration in the FSM?
Reply

Get notified of new replies

To 85 Timing





All times are GMT -4. The time now is 12:50 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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
story-7
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-8
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-9
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE