My car is failing the Carbon Monoxide Loading portion on the State Emissions test.

Asked by ClassicAutoworx May 11, 2009 at 04:10 PM about the 1969 Chevrolet Nova

Question type: Maintenance & Repair

My '69 Nova has about 60,000 on it's 350 V8. It has an Edelbrock 600CFM carb, which passes really low on the Carbon Monoxide idle test. I don't understand how one test could be very low and the other be very high.

My inclination is to go back to work on the carburetor. But perhaps the timing needs to be retarded a few degrees? Just a point in the right direction would help me. This is a California car that I'm trying to get to pass Arizona Emissions. Thanks.

By the way- already tried the parts store "Guaranteed emissions pass" pour in the gas tank solution and higher octane fuel. Put a new K&N air filter on it and checked the plugs. They look clean. The oil was recently changed as well

4 Answers
16,745

Adam answered 14 years ago

If you don't have a catalytic converter, put one on. If you have an old 2-way cat on put a newer 3-way cat on. I know it sucks but it'll make an immense difference in your emissions.

Mark helpful
15

Austin answered 14 years ago

damn, i don't know what to tell you. I'm afraid you'll need to install a catalytic converter. But if you add the zddp additives to your oil for non-roller lifters, cams, or rockers and what not your catalytic converter will fail

Mark helpful
16,745

Adam answered 14 years ago

True, but it takes a LONG time to fail, to my knowledge. They didn't severely cut back ZDDP until fairly recently to protect cats. Figure pretty much every car since 76 has had cats and high amounts of ZDDP... It doesn't seem like a big issue, to be honest I'm not sure why they make such a big deal about it. Likely something I don't know... You may want to put a short removable section in, where you can pull the after testing, just to be on the safe side. It's not required on your car so you don't have to have the cat all the time, but it'll be useful when being tested.

Mark helpful

Your Answer:

Related Questions

Nova

Looking for a Used Nova in your area?

CarGurus has 2 nationwide Nova listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Chevrolet Nova Questions

CarGurus Experts

  • #1
    John Carson
    Reputation
    180
  • #2
    Rowefast
    Reputation
    140
  • #3
    Jon Dunn
    Reputation
    120
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Camaro
17 Great Deals out of 463 listings starting at $11,749
Used Chevrolet Chevelle
8 listings
Used Chevrolet Corvette
20 Great Deals out of 707 listings starting at $10,989
Used Chevrolet Monte Carlo
4 listings starting at $9,800
Used Ford Mustang
39 Great Deals out of 1,657 listings starting at $7,999
Used Chevrolet Impala
6 Great Deals out of 127 listings starting at $5,531
Used Chevrolet C/K 10
2 listings
Used Chevrolet Malibu
56 Great Deals out of 1,060 listings starting at $1,995
Used Pontiac GTO
4 listings
Used Dodge Challenger
28 Great Deals out of 778 listings starting at $12,979
Used Pontiac Firebird
19 listings

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.