CorvetteForum - Chevrolet Corvette Forum Discussion

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

Could it be a bad injector?

Thread Tools
 
Search this Thread
 
Old May 16, 2007 | 05:44 PM
Share
  #1  
Rex Ruby's Avatar
Rex Ruby
Thread Starter
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 9,600
Likes: 88
From: Springfield PA
Philly 'Burbs Events Coordinator
Default Could it be a bad injector?
My Ruby has had a miss.
Thought it was the opti, replaced it, miss is still there.
Thought it may be a bad valve, did a leak down test all was OK
How do you test the injectors?
Reply
0
Old May 16, 2007 | 05:50 PM
Share
  #2  
bogus's Avatar
bogus
Team Owner
25 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Default
hm... thought you had already done this... you had done SO much...

ok, glad the leak down was ok!!!!

remove the rails, put a little paper cup under each injector, and have someone start the motor (coil disconnected). watch for the spray pattern...
Reply
0
Old May 16, 2007 | 05:59 PM
Share
  #3  
Rex Ruby's Avatar
Rex Ruby
Thread Starter
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 9,600
Likes: 88
From: Springfield PA
Philly 'Burbs Events Coordinator
Default
Originally Posted by bogus
hm... thought you had already done this... you had done SO much...

ok, glad the leak down was ok!!!!

remove the rails, put a little paper cup under each injector, and have someone start the motor (coil disconnected). watch for the spray pattern...
Is there a way to do a resistance check?
Reply
0
Old May 16, 2007 | 07:37 PM
Share
  #4  
Demonic85's Avatar
Demonic85
Team Owner
 
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Default
Easier way to test is to stick a screwdriver against each injector while the engine is running. If you can feel clicking then the injector is probably ok.
Reply
0
Old May 16, 2007 | 07:50 PM
Share
  #5  
Cruisinfanatic's Avatar
Cruisinfanatic
Le Mans Master
Supporting Member
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2004
Posts: 6,227
Likes: 697
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Default
any plugs fouled?
Reply
0
Old May 16, 2007 | 07:51 PM
Share
  #6  
Rex Ruby's Avatar
Rex Ruby
Thread Starter
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 9,600
Likes: 88
From: Springfield PA
Philly 'Burbs Events Coordinator
Default
Originally Posted by 4Ever21
Easier way to test is to stick a screwdriver against each injector while the engine is running. If you can feel clicking then the injector is probably ok.

Did that with a finger, they all clicked.
Reply
0
Old May 16, 2007 | 08:01 PM
Share
  #7  
Demonic85's Avatar
Demonic85
Team Owner
 
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Default
Then its possible that it could be a gummed up injector or something of that nature. Have you tried running any fuel injector cleaner?
Reply
0
Old May 16, 2007 | 09:27 PM
Share
  #8  
NHCorvette's Avatar
NHCorvette
Advanced
10 Year Member
 
Joined: Mar 2006
Posts: 62
Likes: 0
From: Auburn New Hampshire
Default
you can check the impedance at each of the injectors, remove the electrical cap off the injector, they should optimally read 16.5 ohms and no more than 1 ohm difference between injectors. Readings below 12.0 are not good.
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-1

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

 Joe Kucinski
story-2

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-3

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

 Michael S. Palmer
story-4

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

 Joe Kucinski
story-5

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

 Joe Kucinski
story-6

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

 Verdad Gallardo
story-7

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

 Joe Kucinski
story-8

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

 Verdad Gallardo
story-9

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
Old May 16, 2007 | 09:36 PM
Share
  #9  
ghlkal's Avatar
ghlkal
Safety Car
Supporting Lifetime Gold
20 Year Member
Community Builder
Community Favorite
Top Answer: 3
 
Joined: Mar 2005
Posts: 4,460
Likes: 1,221
From: Fredonia WI
2025 Corvette of the Year Finalist - Unmodified
2024 C7 of the Year Winner - Unmodified
2023 C4 of the Year Finalist- Modified
2020 C4 of the Year Finalist - Modified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
Default
Originally Posted by NHCorvette
you can check the impedance at each of the injectors, remove the electrical cap off the injector, they should optimally read 16.5 ohms and no more than 1 ohm difference between injectors. Readings below 12.0 are not good.
Right, and in case it's not obvious (it wasn't to me): to remove the electrical connector you need to push the metal clip in towards the injector and then pull the connector off.


Gary
Reply
0
Old May 16, 2007 | 11:59 PM
Share
  #10  
Rex Ruby's Avatar
Rex Ruby
Thread Starter
Le Mans Master
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 9,600
Likes: 88
From: Springfield PA
Philly 'Burbs Events Coordinator
Default
Got 12.6 to 12.3, so are my injectors shot?
Reply
0

Get notified of new replies

To Could it be a bad injector?

Back to Subforum
C4 Tech/Performance
View Next Unread
tranny Question




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 03:33 PM.

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