Forced Induction Superchargers | Turbochargers | Intercoolers

#7 fouling issue

Thread Tools
 
Search this Thread
 
Old Nov 15, 2015 | 08:56 PM
  #1  
ta02zx10r's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (19)
 
Joined: Sep 2004
Posts: 703
Likes: 1
From: Wyoming
Default #7 fouling issue

I haven't been able to pinpoint it because it's intermittent, but for what ever reason#7 will go dead. I've verified with a temp gun. I believe it's spark related because the plug is wet when I pull it. I can hear the cylinder trying to fire because the idle will change. How can ya tell if you have a bad coil or a weak coil? Any input would be greatly appreciated. Thanks
Reply
Old Nov 15, 2015 | 09:04 PM
  #2  
ta02zx10r's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (19)
 
Joined: Sep 2004
Posts: 703
Likes: 1
From: Wyoming
Default

I've checked with a noid light as well
Reply
Old Nov 15, 2015 | 09:37 PM
  #3  
lmt0705's Avatar
TECH Fanatic
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (7)
 
Joined: Apr 2006
Posts: 1,709
Likes: 3
From: buffalo NY
Default

Swap the coil to a different cylinder and see if it follows it. #7 is the first cylinder to have issues though, may want to do leakdown and compression test. Could be broken ring land
Reply
Old Nov 21, 2015 | 09:07 PM
  #4  
ta02zx10r's Avatar
Thread Starter
TECH Enthusiast
20 Year Member
iTrader: (19)
 
Joined: Sep 2004
Posts: 703
Likes: 1
From: Wyoming
Default

The problem does not follow when I swap the coil packs. So it's got to be the plug wire or something along those lines. It is intermittent. Broken ring lands are not intermittent. It fouls the spark plug and it will not fire off once it's fouled. I can change the plug and it will run. I verify that the cylinder is dead by a temp gauge. All the primaries on the other cylinders are 415 degrees and #7 is around 200 degrees. Once I change the plug it'll run at a normal temp. Any ideas?
Reply
Old Nov 21, 2015 | 11:02 PM
  #5  
brandon6.0's Avatar
TECH Addict
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (32)
 
Joined: Dec 2009
Posts: 2,331
Likes: 29
From: Glennville, GA.
Default

Originally Posted by ta02zx10r
The problem does not follow when I swap the coil packs. So it's got to be the plug wire or something along those lines. It is intermittent. Broken ring lands are not intermittent. It fouls the spark plug and it will not fire off once it's fouled. I can change the plug and it will run. I verify that the cylinder is dead by a temp gauge. All the primaries on the other cylinders are 415 degrees and #7 is around 200 degrees. Once I change the plug it'll run at a normal temp. Any ideas?
Bad injector, or valve seals on that cylinder? Changed springs or injectors lately?

Compression test would be best!!
Reply
Old Nov 22, 2015 | 01:27 AM
  #6  
ws602's Avatar
TECH Enthusiast
20 Year Member
iTrader: (2)
 
Joined: Jul 2002
Posts: 548
Likes: 31
From: shreveport,La
Default

Originally Posted by ta02zx10r
The problem does not follow when I swap the coil packs. So it's got to be the plug wire or something along those lines. It is intermittent. Broken ring lands are not intermittent. It fouls the spark plug and it will not fire off once it's fouled. I can change the plug and it will run. I verify that the cylinder is dead by a temp gauge. All the primaries on the other cylinders are 415 degrees and #7 is around 200 degrees. Once I change the plug it'll run at a normal temp. Any ideas?
can you swap injector with another hole?
Reply




All times are GMT -5. The time now is 11:31 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE