C6 Corvette General Discussion General C6 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by: Feral Industries

Check engine light help

Thread Tools
 
Search this Thread
 
Old Feb 16, 2025 | 11:23 AM
  #1  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default Check engine light help

Drove the vette last night for only second time , had check engine light blink for a few seconds and came off while I was driving , scanned the car and got code
p0300 any feedback would be appreciated , 2006 z06 28k miles
Reply
Old Feb 16, 2025 | 11:46 AM
  #2  
Corvette_Ed's Avatar
Corvette_Ed
Race Director
10 Year Member
Liked
Loved
Top Answer: 5
 
Joined: May 2012
Posts: 15,765
Likes: 3,282
From: Phoenix area, AZ
Default

Check to make sure all of your spark plug boots are inserted correctly onto the plug and the coil pack. It's very common for these to come loose, especially at the coil pack.
Reply
Old Feb 16, 2025 | 11:49 AM
  #3  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Also the code reader said pending when it read that code not sure what that implies
Reply
Old Feb 16, 2025 | 01:12 PM
  #4  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

Blinking check engine light means it may damage your cats...the misfire did not occur on the next drive cycle so it will only show pending...other than plugs or wires one needs some advanced diagnostic equipment to accurately diagnose it...what part of Florida are you located ??
Reply
Old Feb 16, 2025 | 01:14 PM
  #5  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Broward , the light came on blinked but then turned off and didn’t come back on

Originally Posted by C5 Diag
Blinking check engine light means it may damage your cats...the misfire did not occur on the next drive cycle so it will only show pending...other than plugs or wires one needs some advanced diagnostic equipment to accurately diagnose it...what part of Florida are you located ??
Reply
Old Jun 28, 2025 | 05:13 PM
  #6  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Not sure what these values mean


Reply
Old Jun 28, 2025 | 05:21 PM
  #7  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

Looks like cylinder #1 is your misfiring cylinder…hope you haven’t been driving around for 4 months with a misfire.
Reply
Old Jun 28, 2025 | 07:23 PM
  #8  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Car is garage kept drove it few times on weekend but not far , I changed the plugs , should I change cylinder 1 wire or coil?


QUOTE=C5 Diag;1608915344]Looks like cylinder #1 is your misfiring cylinder…hope you haven’t been driving around for 4 months with a misfire.[/QUOTE]
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 Jun 28, 2025 | 07:30 PM
  #9  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

I recommend DIY’ers just change plugs and wires…coil packs usually don’t go bad…if you change those 2 parts and you still have a misfire it’s best to seek out a diagnostic shop…you need specialized equipment to check all the other stuff.
Reply
Old Jun 28, 2025 | 10:14 PM
  #10  
TorchRedFred's Avatar
TorchRedFred
Le Mans Master
Community Builder
Liked
Community Favorite
Top Answer: 1
 
Joined: Jan 2017
Posts: 6,139
Likes: 1,962
From: Morris County New Jersey
Default

Originally Posted by Howbtdemcowboys
Car is garage kept drove it few times on weekend but not far , I changed the plugs , should I change cylinder 1 wire or coil?
I just want to clarify, you changed the plugs after you got the check engine light? Or you changed the plugs first and then you got the check engine light?
Reply
Old Jun 28, 2025 | 10:32 PM
  #11  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

I changed it last month after I saw the light

Originally Posted by TorchRedFred
I just want to clarify, you changed the plugs after you got the check engine light? Or you changed the plugs first and then you got the check engine light?
Reply
Old Jul 1, 2025 | 08:15 AM
  #12  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Originally Posted by C5 Diag
I recommend DIY’ers just change plugs and wires…coil packs usually don’t go bad…if you change those 2 parts and you still have a misfire it’s best to seek out a diagnostic shop…you need specialized equipment to check all the other stuff.
how can i diagnose it my self for a bad injector
Reply
Old Jul 1, 2025 | 08:31 AM
  #13  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

You will need a fuel pressure gauge and a factory level scan too to perform an injector balance test or with an injector “pulser” which you can buy on Amazon…you should also check the resistance across the injector looking for 11-14 ohms…read the procedure below.




Reply
Old Jul 1, 2025 | 09:05 AM
  #14  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

thank you!!! is there a reason why it didn't set a code ?

Originally Posted by C5 Diag
You will need a fuel pressure gauge and a factory level scan too to perform an injector balance test or with an injector “pulser” which you can buy on Amazon…you should also check the resistance across the injector looking for 11-14 ohms…read the procedure below.



Reply
Old Jul 1, 2025 | 09:22 AM
  #15  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

Originally Posted by Howbtdemcowboys
thank you!!! is there a reason why it didn't set a code ?

A clogged injector would not set a P0300…the engine computer has no way to determine that your injector is clogged…when there is no combustion the crankshaft slows down and the crankshaft position sensor sees that and sets a misfire code…if you had an issue with the injector wiring that would set a P0200 I believe.
Reply
Old Jul 1, 2025 | 03:46 PM
  #16  
cadbob's Avatar
cadbob
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Jul 2022
Posts: 1,364
Likes: 432
From: Central, Mass
Default

Swap the coil if misfire follows there is your issue. If it is coil I would replace all. Been through similar in a BMW 3 Series.
Reply
Old Jul 2, 2025 | 06:41 PM
  #17  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Just noticed the cylinder 1 injector clip is missing a washer , could that’s cause an issue , where can I get this washer?
Reply

Get notified of new replies

To Check engine light help

Old Jul 3, 2025 | 03:27 PM
  #18  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default


Reply
Old Jul 3, 2025 | 04:47 PM
  #19  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,615
Likes: 4,062
From: Cape Coral, Florida
Default

So misfires on 2 and 6 ??
Reply
Old Jul 3, 2025 | 05:42 PM
  #20  
Howbtdemcowboys's Avatar
Howbtdemcowboys
Thread Starter
Instructor
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 191
Likes: 17
From: Florida
Default

Car warmed up and the misfires went away lol idk what’s going on

Originally Posted by C5 Diag
So misfires on 2 and 6 ??
Reply



All times are GMT -4. The time now is 04:03 AM.

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