C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

But the wires are right !!!!!

Thread Tools
 
Search this Thread
 
Old Aug 29, 2018 | 12:25 PM
  #1  
yelo80vette's Avatar
yelo80vette
Thread Starter
Advanced
10 Year Member
Liked
 
Joined: Jul 2012
Posts: 51
Likes: 1
From: Columbus Ohio
Default But the wires are right !!!!!

About 3 weeks ago I decided to put new plugs and wires in my 1980.
Now it sputters and backfires to the point it can't be driven.
It's acting like one of the plug wires in on the wrong plug.
However, it's been checked and rechecked 5 times. The plugs
have been repulled to check the gap which is perfect.
The wires are on the plugs and the distributor cap tight.
Why why why is it still running this way ??? ! ! !
Reply
Old Aug 29, 2018 | 12:33 PM
  #2  
A88FXRS's Avatar
A88FXRS
Racer
10 Year Member
 
Joined: Dec 2007
Posts: 374
Likes: 12
From: PHILADELPHIA PA
Default

wires out of sequence on the cap !!!! 1 8 4 3 6 5 7 2
Reply
Old Aug 29, 2018 | 12:37 PM
  #3  
yelo80vette's Avatar
yelo80vette
Thread Starter
Advanced
10 Year Member
Liked
 
Joined: Jul 2012
Posts: 51
Likes: 1
From: Columbus Ohio
Default

1 8 4 3 6 5 7 2. Yep. That's how it's wired.
Reply
Old Aug 29, 2018 | 01:05 PM
  #4  
bradleyb66's Avatar
bradleyb66
Burning Brakes
Supporting Lifetime
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2013
Posts: 789
Likes: 129
From: Los Banos CA
Default

Did you remove and replace one wire at a time, or pull them all off and then re-install from scratch? If the latter, then you might be 'one off' on your distributor cap starting point for cylinder #1??

Last edited by bradleyb66; Aug 29, 2018 at 01:06 PM.
Reply
Old Aug 29, 2018 | 01:08 PM
  #5  
yelo80vette's Avatar
yelo80vette
Thread Starter
Advanced
10 Year Member
Liked
 
Joined: Jul 2012
Posts: 51
Likes: 1
From: Columbus Ohio
Default

Oh yea. Always replace them one at a time. And like I said, I literally rechecked it 5 times.
Reply
Old Aug 29, 2018 | 01:08 PM
  #6  
sstonebreaker's Avatar
sstonebreaker
Le Mans Master
15 Year Member
 
Joined: Mar 2006
Posts: 5,775
Likes: 585
From: Texas
Default

Did you replace the coil wire?
Reply
Old Aug 29, 2018 | 01:19 PM
  #7  
yelo80vette's Avatar
yelo80vette
Thread Starter
Advanced
10 Year Member
Liked
 
Joined: Jul 2012
Posts: 51
Likes: 1
From: Columbus Ohio
Default

Yep, sure did.
Reply
Old Aug 29, 2018 | 01:42 PM
  #8  
sstonebreaker's Avatar
sstonebreaker
Le Mans Master
15 Year Member
 
Joined: Mar 2006
Posts: 5,775
Likes: 585
From: Texas
Default

Have you put a timing light on it to make sure you didn't twist the distributor?
Are all the connections tight? Used dielectric grease?
Replaced the coil?
Tried putting the old coil wire back on to see if the new one's defective?
Checked the resistance on all the plug wires?
Done maintenance on the distributor?
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

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

 Michael S. Palmer
story-7

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

 Joe Kucinski
story-8

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

 Joe Kucinski
story-9

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

 Verdad Gallardo
Old Aug 29, 2018 | 03:53 PM
  #9  
bradleyb66's Avatar
bradleyb66
Burning Brakes
Supporting Lifetime
10 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2013
Posts: 789
Likes: 129
From: Los Banos CA
Default

Originally Posted by sstonebreaker
Did you replace the coil wire?
Originally Posted by yelo80vette
Yep, sure did.
Don't you have an HEI distributor? If so, which 'coil wire' did you replace? Other than the coil wire, I agree with SStonebreaker's list of other things to check, and also try replacing the dist cap - it's possible that something else just happened to go bad while you had the hood up...

Oh - one more thing. If you had the dist cap off, check that it's seated properly.
Reply
Old Aug 29, 2018 | 03:54 PM
  #10  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

Put all the old wires back. Run good? Send the new ones back.
Reply
Old Aug 29, 2018 | 04:07 PM
  #11  
BlackC3vette's Avatar
BlackC3vette
Burning Brakes
10 Year Member
 
Joined: Jan 2012
Posts: 943
Likes: 73
Default

Originally Posted by derekderek
Put all the old wires back. Run good? Send the new ones back.
Reply
Old Aug 29, 2018 | 04:07 PM
  #12  
HeadsU.P.'s Avatar
HeadsU.P.
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Default

Don't let wire numbers 5 & 7 anywhere near each other. Separate them with your wire looms or sometimes they will crossfire.

Last edited by HeadsU.P.; Aug 29, 2018 at 07:53 PM.
Reply
Old Aug 29, 2018 | 08:19 PM
  #13  
Milan454's Avatar
Milan454
Instructor
 
Joined: Sep 2017
Posts: 169
Likes: 20
From: Westlake Ohio
Default

Might ground one cylinder at a time with a test light probe and identify the culprit cylinder. Then swap plug and wire to adjacent cylinder and retest.
Reply
Old Aug 29, 2018 | 08:33 PM
  #14  
sstonebreaker's Avatar
sstonebreaker
Le Mans Master
15 Year Member
 
Joined: Mar 2006
Posts: 5,775
Likes: 585
From: Texas
Default

Originally Posted by derekderek
Put all the old wires back. Run good? Send the new ones back.
Good idea. Didn't think of that one.
Reply
Old Aug 29, 2018 | 10:59 PM
  #15  
naramlee's Avatar
naramlee
Burning Brakes
 
Joined: May 2018
Posts: 797
Likes: 156
From: England AR
Default

check for:
a broken spark plug
heat range
spark gap
plug brand

Last edited by naramlee; Aug 29, 2018 at 11:02 PM.
Reply
Old Aug 29, 2018 | 11:10 PM
  #16  
sambrand's Avatar
sambrand
Racer
 
Joined: May 2018
Posts: 297
Likes: 43
Default

if you pulled all the wires and replaced them at the same time theres a good chance you reversed 1 and 6, dizzy can be installed either way and only the rotor pointing to tdc is at number 1, or its 180 degrees off, ive seen this very exact same issue a dozen times
Reply
Old Aug 30, 2018 | 10:37 AM
  #17  
yelo80vette's Avatar
yelo80vette
Thread Starter
Advanced
10 Year Member
Liked
 
Joined: Jul 2012
Posts: 51
Likes: 1
From: Columbus Ohio
Default

Originally Posted by HeadsU.P.
Don't let wire numbers 5 & 7 anywhere near each other. Separate them with your wire looms or sometimes they will crossfire.
Wow. I had no idea. Thanks for the info.
Reply

Get notified of new replies

To But the wires are right !!!!!

Old Aug 30, 2018 | 11:47 AM
  #18  
cv67's Avatar
cv67
Team Owner
15 Year Member
 
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Default

Cant tell you how many times I had 5 and 7 to the wrong plug after checking it again and again.
Curious to see if you didnt crack a plug when torquing it down
Reply
Old Aug 30, 2018 | 04:14 PM
  #19  
80-Vette's Avatar
80-Vette
Racer
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2013
Posts: 331
Likes: 29
From: Moyock NC
Default

Originally Posted by sambrand
if you pulled all the wires and replaced them at the same time theres a good chance you reversed 1 and 6, dizzy can be installed either way and only the rotor pointing to tdc is at number 1, or its 180 degrees off, ive seen this very exact same issue a dozen times
Been there done that.
Reply
Old Oct 22, 2018 | 01:45 PM
  #20  
Tazz 1's Avatar
Tazz 1
Cruising
 
Joined: Sep 2018
Posts: 14
Likes: 1
Default Spark Plugs

Did you by chance drop any of your plugs on the ground, I dropped a plug one time and it cracked, car ran like crap. Took me forever to find out what was wrong.

Last edited by Tazz 1; Oct 22, 2018 at 01:46 PM. Reason: word
Reply



All times are GMT -4. The time now is 07:40 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