Good tip.
Help with Diagnosis Please!
Thread Starter
Pro
Joined: Jul 2000
Posts: 590
Likes: 1
From: Suffolk New York
Help with Diagnosis Please!
Recently had a Dyno tune... car running great for about two weeks.
Now however I hear backfiring in the exhaust not loud at the tail pipe.
1. Car starts and runs well when cold
2. Pops start after car warms up a bit.
Car runs but poorly kinda like a misfire but NO codes on the DIC. No check engine light.
3. Wires and Plugs are new.
4. I did use Z06 fuel injectors (used) on my C5
5. I checked for broken valve springs since I did a cam job.
I'm thinking a stuck injector? How do I troubleshoot that?
Just replace all the Z06 injectors with my original ones?
Thanks any help will be appreciated, otherwise I'll just take it to my dyno shop again.
Now however I hear backfiring in the exhaust not loud at the tail pipe.
1. Car starts and runs well when cold
2. Pops start after car warms up a bit.
Car runs but poorly kinda like a misfire but NO codes on the DIC. No check engine light.
3. Wires and Plugs are new.
4. I did use Z06 fuel injectors (used) on my C5
5. I checked for broken valve springs since I did a cam job.
I'm thinking a stuck injector? How do I troubleshoot that?
Just replace all the Z06 injectors with my original ones?
Thanks any help will be appreciated, otherwise I'll just take it to my dyno shop again.
Banned Scam/Spammer
Joined: Jul 2006
Posts: 2,911
Likes: 10
From: Simi Valley CA
edit: oh, now I see your sig.. LOL. B&Bs do pop when running right. If it's quiet, it's running rich.
Race Director
Joined: Nov 2005
Posts: 14,553
Likes: 1,549
From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Recently had a Dyno tune... car running great for about two weeks.
Now however I hear backfiring in the exhaust not loud at the tail pipe.
1. Car starts and runs well when cold
2. Pops start after car warms up a bit.
Car runs but poorly kinda like a misfire but NO codes on the DIC. No check engine light.
3. Wires and Plugs are new.
4. I did use Z06 fuel injectors (used) on my C5
5. I checked for broken valve springs since I did a cam job.
I'm thinking a stuck injector? How do I troubleshoot that?
Just replace all the Z06 injectors with my original ones?
Thanks any help will be appreciated, otherwise I'll just take it to my dyno shop again.
Now however I hear backfiring in the exhaust not loud at the tail pipe.
1. Car starts and runs well when cold
2. Pops start after car warms up a bit.
Car runs but poorly kinda like a misfire but NO codes on the DIC. No check engine light.
3. Wires and Plugs are new.
4. I did use Z06 fuel injectors (used) on my C5
5. I checked for broken valve springs since I did a cam job.
I'm thinking a stuck injector? How do I troubleshoot that?
Just replace all the Z06 injectors with my original ones?
Thanks any help will be appreciated, otherwise I'll just take it to my dyno shop again.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
Let it idle warm for 15 minutes , shut it off and then check to see what the plugs look like. Old school checking of what color the plugs are could show you if they are rich (black or sooty).
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Thread Starter
Pro
Joined: Jul 2000
Posts: 590
Likes: 1
From: Suffolk New York
not much, the Vette Doctors did it.
I pulled the injectors intact and turned the ignition switch on to pressurize the rails, none of the injectors were leaking. (Is this a valid test?)
Tried to determine which bank the pops were coming from but with a crossover pipe, I couldn't. Tried to use a big screwdriver like a stethescope and couldn't determine anything.
I pulled the wires and each had spark.
I haven't pulled the plugs yet.
Until the car warms up it runs great then after it warms up under hard acceleration the backfiring starts.
I'm just going to take it back to the Vette Doctors let them find te problem.
I pulled the injectors intact and turned the ignition switch on to pressurize the rails, none of the injectors were leaking. (Is this a valid test?)
Tried to determine which bank the pops were coming from but with a crossover pipe, I couldn't. Tried to use a big screwdriver like a stethescope and couldn't determine anything.
I pulled the wires and each had spark.
I haven't pulled the plugs yet.
Until the car warms up it runs great then after it warms up under hard acceleration the backfiring starts.
I'm just going to take it back to the Vette Doctors let them find te problem.
Thread Starter
Pro
Joined: Jul 2000
Posts: 590
Likes: 1
From: Suffolk New York
Because I pulled the whole rail set with the injectors on and checked for a leaker by pressuring the manifold, no leakers.
I want to thank everyone for trying to help!!!!!!