Last year without a catalytic converter, but other emissions devices were present. PCV was mandatory from '68. GM added EGR in '73. Most cars had thermostatic air cleaners by '74 as well as EVAP (charcoal canister). The federal pollution acts include all 1968 and later cars. You're only required to retain whatever the car came with, though. You don't have to retrofit anything so they can't make you add a cat to a '74 model.

 

Wow, I'm lucky here in NC. Emissions testing for '96 and above.

My '02 Intrepid just failed it's emissions test because the "Check Engine" light was on. Local service station tech said it probably was a loose gas cap, so he reset the light, cleared out the memory, and had me drive it around for a day, then come back. The next day it passed. The light is not back on. The Dodge dealership would have "fixed" the problem with some new parts, for sure.

No one can convince me that dealerships don't EARN their reputation.

 

Wow im suprised they will let it pass the visual since its not the original engine. Thats cool.

Just register the car outside of city limits (check county) but in Weld county you aren't required to have an emissions test. Easy way around it.

 

Last I heard it was still bouncing around down at the Capital building. There's a lot of interesting "politics" out here and they have approved and then reversed it couple of times already.

I'll make some calls and find it where it's at this time. Crossed Fingers!

Lars,

You are correct, with a clause. He hadn't specified which range, CO vs HC. Adding TOO much CH3CH2CH2OH will push the HC up in many cases (especially stock or near/stock), unless it's been tuned rich for some unknown reason. (cam again?) As you know, many presume that more gas = more power and all their numbers go up when they start screwing with stuff. Plugs every 2 months sound familiar anyone?

Leaning it out across the board (artificially or through tuning) works in some cases.

I've also got some emissions before and after sheets that show just a bit cleans up the burn on both scales, partially burnt and non-burnt...... It's a matter of what state of tune the motor is in and what mix gets applied at the time.

1st and foremost verify the basics (spark, air, and compression) and tune accordingly. If his "project" has a bad plug or toasted rings timing changes will not get around that.

BTW- How do you tune around the overlap in a big cam?
That's raw fuel blowing past those exhaust valves...

Hey Robin, what's the overall feel for the way the motor is running?
Smooth, jumpy, ???
Please tell me there's no smoke...

Did the car sit for any length of time without fuel stabilizer. Air passages could be plugged up. Carb will need gone through.
How many miles on the engine? Carboned up chambers do not burn clean... etc, etc, etc,

Think beyond this test and get it tuned first.

VLTW!

 

Thanks for all the good feedback.

I do not have the details as to what part of the emissions test failed - just that it failed. I will get the details on Monday.

I have no idea what the true mileage is on this corvette since the speedo and tach were disconnected. The air conditioning unit has been removed (due to the larger engine taking up that space). Most of the wiring inthe engine compartment has been cut, or just left hanging. The headlights do not pop-up. As I mentioned - its a real Project vehicle.

I did however purchase a brand new, out fo the box, Holley 4150 Carb (650 cfm), but that didn't seem to help it pass the emissions. There are brand new plugs, fresh oil, and new guts in the distributor. There is some (very minor) smoke coming out the right exhaust.

It was running VERY rough, but that was with the old carb/plugs. Since the shop has had it I have not seen it run.

 

I agree. He may be able to tune the carb to allow you to pass emissions.

 

Where in Colorado are you? I know a guy In Colorado Springs that will inspect anything for $75...

 

I'm in Colorado Springs

 

Good info on the new carb and elec bits.
Bone stock non-tuned for your specific app. I will leave that to Lars, the carb guru (aka The MAN), he's probably knows just where to set things for you.

Was it white, blue or black smoke?
Present entire time engine is running?
Worse under heavy throttle?


Getting closer!

 

The only real smoke I saw was after I'd turned the engine it off and it was just wisping out of the right exhaust. I think it was a white smoke, but since there wasn't that much I can't be 100% sure. I never saw anny smoke while it was running. The guys at the shop said they saw "some" smoke, but didn't elaborate.

 

Man, I remember my dad adding bottles of rubbing alcohol to his gas tank come emissions time in Florida. It used to work on his beaters. The cars would squeak by.

 

The guy I know is a little two bay garage on Nevada about 1/2 block north of I-25. He's on the east side of Nevada. At that point, Nevada is one way, so you have to come from the south. You can't miss him - only two bay garage in that area. I can't remember the name.. sorry.

Just tell him up front that your car won't pass emissions. He'll tell you it's $25 for the emissions test and $50 for 'adjustments'.

 

I have never seen one fail in this manner...

This is not an excuse for not tuning it properly, ESPECIALLY with Corvettes.