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

Timing on 87

Thread Tools
 
Search this Thread
 
Old Mar 7, 2003 | 12:24 AM
  #1  
tophorse's Avatar
tophorse
Thread Starter
Intermediate
 
Joined: Feb 2003
Posts: 32
Likes: 0
From: tucson az
Default Timing on 87

I just finished my intake job. My car won't start, because I didn't know how to install my distributor with timing light. After I received some advice, I try to readjust my Piston #1 to match my rotor. Here is what I did:
1. turn camshaft until the white line match with the timing plate(before, after,.....). Then I adjust my rotor to point to #1 spark plug terminal. The car try to start but it doesn't have enough power to start. I find out the battery is gone. so I put a new battery and try to start it again. After several attempt, the car start, but I have to keep tap the accelerator. The car will die as soon as I stop tap accelerator. I also see some black smoke at the exhust pipe and some stem at the precat. Can anyone tell me what cause this or it could just be the chemical I use to clean the old gasket in the intake. What should I adjust to release my feet from the accelerator? Am I doing the correct way to start the car. Thanks very much :nono:
Reply
Old Mar 7, 2003 | 12:28 PM
  #2  
VetNutJim's Avatar
VetNutJim
Safety Car
 
Joined: May 1999
Posts: 3,651
Likes: 5
From: Atlantis
Cruise-In I Veteran
Default Re: Timing on 87 (tophorse)

Tophorse.

Sounds like your timing is not set correctly.
There are TWO positions that the 'white line' lines up.
You just need to be sure the line, lines up on the compression stroke of the number 1 cylinder.

To make sure, remove the # 1 plug and use a compression gauge to see when the cylinder is coming to the top of the compression stroke.
Have an assistant 'bump' the starter for you while you watch the gauge.
As soon as you see compression start to build..stop turning the engine with the starter.
If it went too far crank on around again until it starts coming up on the compression stroke.
Turn the CRANKSHAFT MANUALLY until your timing lines match up.

Here you can install the distributor.

Remove the distributor cap so you can see the ROTOR.
Point the rotor at the number one spark plug.
The distributor shaft will rotate a little as it meshes with the cam gear so you may need to offset it a litle to end up with the rotor pointed towards the #1 plug.

Set the distributor cap back in place and (BE CAREFUL HERE) you need to make SURE the plug wire that is directly OVER the distributor rotor goes to number one cylinder.

Using the firing order of 1 8 4 3 6 5 7 2 make SURE each plug wire goes to the correct plug.

IF the distributor wires have been removed and replaced incorrectly you may NOT find #1 cylinder plug wire directly under the rotor point.
In this case, simply remove the wires and put them back on using #1 as a reference.
Then make SURE again each wire goes to the correct cylinder.

The engine should now start and run.
Now you can use your timing light.
Be sure to disconnect the ESC reference wire at the distributor before attempting to set the 'base timing'. Base timing on an L98 is 6 BTDC.

Be SURE and check for vacumn leaks if you've had the intake off.
Your system is a MSF system so be SURE to check for air leaks before and after the MAF. Particularly AFTER the MAF.

That's about it. Good 'ruck with it!


Reply
Old Mar 7, 2003 | 01:19 PM
  #3  
tophorse's Avatar
tophorse
Thread Starter
Intermediate
 
Joined: Feb 2003
Posts: 32
Likes: 0
From: tucson az
Default Re: Timing on 87 (tophorse)

"The engine should now start and run.
Now you can use your timing light.
Be sure to disconnect the ESC reference wire at the distributor before attempting to set the 'base timing'. Base timing on an L98 is 6 BTDC.

Be SURE and check for vacumn leaks if you've had the intake off.
Your system is a MSF system so be SURE to check for air leaks before and after the MAF. Particularly AFTER the MAF.

COULD ANYONE EXPLAIN TO ME WHY WE HAVE TO DO THIS STEP? WHAT IS TIMING LIGHT? WHERE ARE THEY? WHAT AND WHERE IS ESC WIRE? WHAT IS " BASE TIMING"? WHAT IS MAF? SORRY TO ASK SO MANY QUESTIONS. I AM STILL NOT CLEAR ON THIS PART.

Reply
Old Mar 7, 2003 | 06:21 PM
  #4  
tophorse's Avatar
tophorse
Thread Starter
Intermediate
 
Joined: Feb 2003
Posts: 32
Likes: 0
From: tucson az
Default Re: Timing on 87 (VetNutJim)

"The engine should now start and run.
Now you can use your timing light.
Be sure to disconnect the ESC reference wire at the distributor before attempting to set the 'base timing'. Base timing on an L98 is 6 BTDC.
Be SURE and check for vacumn leaks if you've had the intake off.
Your system is a MSF system so be SURE to check for air leaks before and after the MAF. Particularly AFTER the MAF.

COULD ANYONE EXPLAIN TO ME WHY WE HAVE TO DO THIS STEP? WHAT IS TIMING LIGHT? WHERE ARE THEY? WHAT AND WHERE IS ESC WIRE? WHAT IS " BASE TIMING"? WHAT IS MAF? SORRY TO ASK SO MANY QUESTIONS. I AM STILL NOT CLEAR ON THIS PART.


Reply
Old Mar 7, 2003 | 08:01 PM
  #5  
HighHopes85's Avatar
HighHopes85
Drifting
10 Year Member
 
Joined: Mar 2001
Posts: 1,636
Likes: 3
From: Lafayette IN
Default Re: Timing on 87 (tophorse)

"The engine should now start and run.
Now you can use your timing light.
Timing light--A device that has a strobe light effect. When working correctly, every time the inductive lead senses electricity passing through the wire, the light flashes. Hook it up to #1 wire, aim at timing mark, and rotating balancer becomes "stationary" to the eye.

Be sure to disconnect the ESC reference wire at the distributor before attempting to set the 'base timing'. Base timing on an L98 is 6 BTDC.
ESC bypass eliminates the computer control of the timing. When this wire is disconnected, the control module provides full control over the advance and retard. You don't wnat the computer adding advance when setting timing...so you do it like mentioned.

Be SURE and check for vacumn leaks if you've had the intake off.
Your system is a MAF system so be SURE to check for air leaks before and after the MAF. Particularly AFTER the MAF.
MAF is a Mass AirFow sensor. Your computer uses it to see how much air is entering the engine. A leak after the MAF will likely give false readings to the ECM.

Base timing-What you set the timing at when you are setting timing according to specifications. Look at the emissions label on your radiator shroud. The radiator shroud is the plastic piece on top of the radiator. Will likely be on the drivers side. Gives more info on setting base timing.

Timing lights cost anywhere from $25 to $100 bucks. It may be cheaper for you to take it to a shop if you do not own one/know how to operate one. They might let you watch them set the timing, so you will be able to later on down the road. Good luck, -85Y
Reply

Get notified of new replies

To Timing on 87





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

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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