Emissions help needed
Thread Starter
Pro
Joined: Oct 2000
Posts: 558
Likes: 22
From: Vancouver, B.C., Canada
Emissions help needed
Need help with emission testing if I can. Trying to get my car through our local emissions testing but it keeps failing due to high CO (Carbon Monoxide) readings.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
Originally Posted by Kim72
Need help with emission testing if I can. Trying to get my car through our local emissions testing but it keeps failing due to high CO (Carbon Monoxide) readings.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
Make sure that the carb is not bleeding. If it's a Q-Jet, the base plugs underneath leak after a while, and drip fuel right into the manifold.
Let us know!
Race Director
Joined: Jul 2004
Posts: 12,686
Likes: 329
From: Scottsdale Arizona
Further to Paul's suggestions above, make sure that the basics are done as well such as a fresh air filter and fresh (but not too fresh) crankcase oil. What kind of engine vent are you running , PCV? Can't remember what was standard in that year. In any case, you could be drawing combustibles from your crankcase and exacerbating your rich condition.
Just my 2 cents (3 cents Canadian)
Just my 2 cents (3 cents Canadian)
Pro
Joined: Aug 2001
Posts: 667
Likes: 3
From: College Station TX
Originally Posted by Kim72
Need help with emission testing if I can. Trying to get my car through our local emissions testing but it keeps failing due to high CO (Carbon Monoxide) readings.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
Engine: 1972 - 454 big block, 750 Edelbrock carb, MSD ignition, Hedman headers
On the drive test car readings for CO were 4.39% where max. allowable is 3.00%. This is the first year I have had trouble with this. Previous years have been fine. I've "de-tuned" the engine (retarded the timing, cranked down the idle jets, changed the oil, etc...) but can't seem to make any difference to the CO. Any suggestions?? Is this a carb issue?? Any help is appreciated.
