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

Changing spark plugs...

Thread Tools
 
Search this Thread
 
Old Sep 17, 2007 | 10:07 AM
  #1  
Nav Vet's Avatar
Nav Vet
Thread Starter
Instructor
 
Joined: Jul 2005
Posts: 232
Likes: 0
From: Charlotte NC
Default Changing spark plugs...

I was able to change all spark plugs on my 91 L98 Corvette...EXCEPT the most forward one on the passenger side.

After hours of grunts and groans, I left it alone.
The car now has a tune up, except for that plug.

Any recommendations / tools to use no how to get to that thing?

Last edited by Nav Vet; Sep 17, 2007 at 10:07 AM. Reason: spelling
Reply
Old Sep 17, 2007 | 10:12 AM
  #2  
rick lambert's Avatar
rick lambert
Le Mans Master
10 Year Member
 
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Default

If memory serves correct...I go through the wheel well, and here's a little trick (saves you from cross threading) get a short piece of fuel line..3-4 inches, stick it on the new plug and use it to thread in the new plug finger tight before putting a wrench on it. Hope you're using anti sieze on the new plugs?
Reply
Old Sep 17, 2007 | 10:14 AM
  #3  
Nav Vet's Avatar
Nav Vet
Thread Starter
Instructor
 
Joined: Jul 2005
Posts: 232
Likes: 0
From: Charlotte NC
Default

Originally Posted by rick lambert
If memory serves correct...I go through the wheel well, and here's a little trick (saves you from cross threading) get a short piece of fuel line..3-4 inches, stick it on the new plug and use it to thread in the new plug finger tight before putting a wrench on it. Hope you're using anti sieze on the new plugs?
Did you have to remove anything to get to it (hoses, etc)?
Reply
Old Sep 17, 2007 | 11:23 AM
  #4  
NEVRL8T's Avatar
NEVRL8T
Race Director
 
Joined: Mar 2006
Posts: 11,628
Likes: 1
From: Sherwood, Arkansas
Default

Originally Posted by Nav Vet
Did you have to remove anything to get to it (hoses, etc)?
Remove the wheel well and thats it.
Reply
Old Sep 17, 2007 | 12:45 PM
  #5  
skybolt31's Avatar
skybolt31
Drifting
20 Year Member
All Eyes On Me
Liked
Loved
 
Joined: Dec 2003
Posts: 1,492
Likes: 94
From: Westfield MA
Default

Originally Posted by Nav Vet
I was able to change all spark plugs on my 91 L98 Corvette...EXCEPT the most forward one on the passenger side.

After hours of grunts and groans, I left it alone.
The car now has a tune up, except for that plug.

Any recommendations / tools to use no how to get to that thing?
Are you saying you could get a socket on it but not loosen it or that you couldn't get a socket on it?

I changed mine on my 86 and don't remember anything especially different, could be that there is something in the way on a 91.
Reply
Old Sep 17, 2007 | 02:36 PM
  #6  
Nav Vet's Avatar
Nav Vet
Thread Starter
Instructor
 
Joined: Jul 2005
Posts: 232
Likes: 0
From: Charlotte NC
Default

I got a socket on it but could not turn the wrench.
If there's no special tool required for access to it...I'll try again this weekend.
Reply
Old Sep 17, 2007 | 02:42 PM
  #7  
mseven's Avatar
mseven
Le Mans Master
 
Joined: Feb 2005
Posts: 5,146
Likes: 3
From: The Motor City
Default

you can either take out top of wheel well, ac 'bar' brace, and use a 3/8 drive swivel socket.
Reply
Old Sep 17, 2007 | 03:16 PM
  #8  
xflagz51's Avatar
xflagz51
Racer
15 Year Member
 
Joined: Aug 2005
Posts: 336
Likes: 3
From: State of Confusion
Default

Originally Posted by skybolt31
Are you saying you could get a socket on it but not loosen it or that you couldn't get a socket on it?

I changed mine on my 86 and don't remember anything especially different, could be that there is something in the way on a 91.
I changed the spark plugs on my '90 and it really wasn't a big deal. Not like a Mitsu 3000GT VR4, you might as well buy a new car when it comes time to change the spark plugs.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

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

 Joe Kucinski
story-2

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

 Joe Kucinski
story-3

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

 Verdad Gallardo
story-4

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

 Joe Kucinski
story-5

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

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

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

 Michael S. Palmer
story-8

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

 Joe Kucinski
story-9

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

 Michael S. Palmer
Old Sep 17, 2007 | 03:31 PM
  #9  
tachout's Avatar
tachout
Racer
10 Year Member
 
Joined: Jun 2007
Posts: 486
Likes: 0
From: Sandy Ut
Default

First I would spray it with some liquid wrench or something, and then let it sit for a couple of hours if possible. Then try to take it out. Make sure not to use an extension if you do not have to, or anything else. Just the socket and the ratchet or breaker bar.

For reinstalling, I like using either a piece of fuel line as already sugested or my spark plug installation too, (Better know as an old spark plug boot off the old wires before I threw them away the last time). I used to have one of those fancy real spark plug installation tools, but found the boot off of an old set of Autolite plug wires worked better.
Reply
Old Sep 17, 2007 | 06:28 PM
  #10  
65Z01's Avatar
65Z01
Team Owner
20 Year Member
 
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Default

To access the plugs on the passenger side I remove:
-the wheel well access panel
-two AIR hoses
-A/C compressor rear brace

For plugs #2 & #4 I go in through the wheel well opening with a 3/8" socket, extensions & swivel. Of course I hand start the new plugs before going to the socket.
Reply
Old Sep 17, 2007 | 07:37 PM
  #11  
bills1985corvette's Avatar
bills1985corvette
Racer
 
Joined: Mar 2004
Posts: 252
Likes: 1
From: Troy Illinois
Default

Put a plug socket on the plug and then use an openend wrench to remove the plug using the nut on the end of the socket. Install the same way. Plugs only need to be snug and don't forget anti seize compound.
Reply

Get notified of new replies

To Changing spark plugs...





All times are GMT -4. The time now is 12:11 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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