Welcome to the Corvette Forums at the Corvette Action Center!

So I failed..............Emissions

80Vette

Well-known member
Joined
Jul 3, 2006
Messages
63
Location
Portland OR
Corvette
1980 pearl white vette
Took the 1980 Vette to the DEQ and FAILED!

The motor has only 2300 miles on a new engine. It does have a 3/4 cam but that's about it for mods.
All the emissions are on there (catalytics etc, PCV etc) but I had high (HC) readings. HC readings are supposed to be 220 but my car ran a 378. D@MN! The stupic car gets much better gas mileage than our new Durango


So, any advice from you Portland OR Vette drivers with a C-3 era Vette, forced to play (new car standards) in an (old car technology)???

Perhaps a re-jetting of the carbs, tune-up kit plugs/wires/rotor, vacuum leak somewhere??


Agggggggggggggghhhhhhhhhhhhhhhhhhhhh


Andy
 

80Vette

Well-known member
Joined
Jul 3, 2006
Messages
63
Location
Portland OR
Corvette
1980 pearl white vette
Thanks Stephan!

Appreciate that!


Andy
 
Joined
Apr 29, 2001
Messages
2,141
Location
Rio Rancho, NM
Corvette
1981 HD Suspension; ZN1 Option
Took the 1980 Vette to the DEQ and FAILED!

...
All the emissions are on there (catalytics etc, PCV etc) but I had high (HC) readings...Agggggggggggggghhhhhhhhhhhhhhhhhhhhh
Andy

And they didn't check the engine vitals for you? :mad

If your timing is higher than at the factory setting, then your HC's could climb.

For example, I recently communicated with Lars Grimsrud, a very knowledgeable Corvette "guru" who has posted on the web some papers on automotive stuff, on a timing question for my L81.

He hinted that if I were to alter the initial timing on my L81-based distributor, then I could see a measure of improvement on performance for the L81 (in the + direction), but that the drawback would be that I could also see a climb on hydrocarbons.

Now, here in New Mexico we have those emission testing places that is about as big as single car garage in size, and all they do is tell you if you pass or not. I would not let those types of business make any adjustments on my car (even though they are very convenient for satisfying the requirements if need be), but if it is a regular shop, the they should have investigated what the probable causes are.

GerryLP:cool
 

80Vette

Well-known member
Joined
Jul 3, 2006
Messages
63
Location
Portland OR
Corvette
1980 pearl white vette
Thanks for the valuable input Gary, you see...here in Oregon, if you don't drive a Volvo wagon burning Bio-Diesel or drive a Subaru wagon, you're viewed as some type of knuckle dragging, un-enlightened neanderthal.
Any older, American V8 is considered a war monger. Not kidding either. This place is brutal for a Vette owner (C4 and older).

I've sent it to the Vette shop here in Portland and have found out that the carb was bad & had been tampered with. So, we're going to put in Edelbrock hi-rise performer manifold & a new edelbrock carb set-up. It has been guaranteed to pass.

So, silver lining, the car will be getting 15 to 10 more HP:upthumbs


Andy
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Win Both Corvettes!

Win Both Corvettes and Get Extra Bonus Tickets Now!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Parts/Accessories:

Dead Center Foundation

Vetteskins

Advertise with the Corvette Action Center!

Partners

Top Bottom