Black smoke at WOT
Black smoke at WOT I am hoping you all can give me a few suggestions that might help me determine why I have black smoke at WOT.
My mods are listed below:
TEA stage 1.5 5.3L heads milled .015
TR224/114 cam
Stock length push rods
Stock (factory) timing chain
LS6 intake
30# SVO injectors
Mac headers
Ported TB
De-screened stock MAF
Fast Toys Ram Air kit
ASP pulley
Built 4L60E with a PT4000 stall converter
I use EFILive, Innovate Motorsports WB O2 meter, and LS1Edit to tune the car.
LTFT are between -.8 and -10 while at cruse and 0 at WOT.
WOT AFR bounces around between 12.7 and 13.1 depending on what gear and RPM.
My AFR looks good. I have confirmed proper operation of the WB on other cars.
I know black smoke is not always an indication of a rich condition. It can also be an indication of incomplete combustion.
Any suggestions?
Thanks
John
My mods are listed below:
TEA stage 1.5 5.3L heads milled .015
TR224/114 cam
Stock length push rods
Stock (factory) timing chain
LS6 intake
30# SVO injectors
Mac headers
Ported TB
De-screened stock MAF
Fast Toys Ram Air kit
ASP pulley
Built 4L60E with a PT4000 stall converter
I use EFILive, Innovate Motorsports WB O2 meter, and LS1Edit to tune the car.
LTFT are between -.8 and -10 while at cruse and 0 at WOT.
WOT AFR bounces around between 12.7 and 13.1 depending on what gear and RPM.
My AFR looks good. I have confirmed proper operation of the WB on other cars.
I know black smoke is not always an indication of a rich condition. It can also be an indication of incomplete combustion.
Any suggestions?
Thanks
John
Last edited by JNorris; Jun 28, 2004 at 07:43 AM.
TECH Regular
Joined: Apr 2003
Posts: 413
Likes: 0
From: Atlanta, GA
Originally Posted by JNorris
I am hoping you can give me a few suggestions that might help me determine why I have black smoke at WOT.
My mods are listed below:
TEA stage 1.5 5.3L heads milled .015
TR224/114 cam
Stock length push rods
Stock (factory) timing chain
LS6 intake
30# SVO injectors
Mac headers
Ported TB
De-screened stock MAF
Fast Toys Ram Air kit
ASP pulley
Built 4L60E with a PT4000 stall converter
I use EFILive, Innovate Motorsports WB O2 meter, and LS1Edit to tune the car.
LTFT are between -.8 and -10 while at cruse and 0 at WOT.
WOT AFR bounces around between 12.7 and 13.1 depending on what gear and RPM.
My AFR looks good. I have confirmed proper operation of the WB on other cars.
I know black smoke is not always an indication of a rich condition. It can also be an indication of incomplete combustion.
Any suggestions?
Thanks
John
My mods are listed below:
TEA stage 1.5 5.3L heads milled .015
TR224/114 cam
Stock length push rods
Stock (factory) timing chain
LS6 intake
30# SVO injectors
Mac headers
Ported TB
De-screened stock MAF
Fast Toys Ram Air kit
ASP pulley
Built 4L60E with a PT4000 stall converter
I use EFILive, Innovate Motorsports WB O2 meter, and LS1Edit to tune the car.
LTFT are between -.8 and -10 while at cruse and 0 at WOT.
WOT AFR bounces around between 12.7 and 13.1 depending on what gear and RPM.
My AFR looks good. I have confirmed proper operation of the WB on other cars.
I know black smoke is not always an indication of a rich condition. It can also be an indication of incomplete combustion.
Any suggestions?
Thanks
John
How long does the black smoke appear @ WOT?
Originally Posted by JNorris
"How long does the black smoke appear @ WOT?"
Until I let off the gas.
Until I let off the gas.
Teching In
Joined: Jun 2004
Posts: 1
Likes: 0
From: West Hills, Ca.
Black Smoke at WOT I have a 2001 Trans Am and I was having the same problem. I have some minor modifications such as MAC headers and cats, slp loud mouth cat back exhaust, msd superconductors, slp lid intake, ls6 MAF, Hypertech Programmer III, and a Hypertech Powerstat 160 degree. My car was eating excessive oil, more than a quart every 1,000 miles. GM ran a oil consumption test on my car and decided to rering the cylinders. I kept having black smoke sometimes when I started it cold and when revving over 3,000 rpms. It turned out that I had scratches on the cylinder walls allowing oil to seep past the rings. GM completely replaced my engine with a brand new 2004 crate ls1 motor.
Originally Posted by TA2SLOW346
Do a WOT run and at top of 3rd kill the ignition and do a plug reading. reading the plugs might tell you something other then what the wideband is telling you. You might find one cylinder different then the rest also.
Thanks for the suggestion.
Although I have not checked the plugs exactly as you described, I have pulled the plugs and they are consistent (light/white ceramic and electrode) with what you would excect with proper AFR.
