C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Help me pass emissions...

Thread Tools
 
Search this Thread
 
Old May 7, 2011 | 01:31 PM
  #1  
tiger38117's Avatar
tiger38117
Thread Starter
Advanced
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Mar 2009
Posts: 60
Likes: 1
From: Memphis TN
Default Help me pass emissions...

I am trying to see if I can squeeze my car through local emissions.It is an '89 with headers, no cats, and emission equipment disconnected. I know the easy response would be to say "you can't pass emissions with no emissions equipment", but the car is really not that far from passing. I am looking for tips and tricks.

Our local test checks only Hydrocarbons and Carbon Monoxide. Last week, my results of the first test were:

HC: 189ppm, allowable 220ppm, PASS
CO: 3.05%, allowable 1.20%, FAIL

So this morning, I added a bottle of alcohol to a 1/4 tank of gas and headed back to the testing station. Results today:

HC: 222ppm (220) FAIL
CO: 2.51% (1.20%) FAIL

Improvement in CO but worse in HC.

I am new to emissions, in the past I have always had cars that are exempt so I have never worried about all this. If anyone has any tricks of the trade to get this thing through, I'd appreciate it.

Scott
Reply
Old May 7, 2011 | 01:43 PM
  #2  
oldalaskaman's Avatar
oldalaskaman
Le Mans Master
10 Year Member
 
Joined: Aug 2010
Posts: 9,272
Likes: 17
Default

give the tester $50 and have him use an air hose on his machine, dont know if that still works, the other way used to be to give your car a vacum leak, dont think that one works either......nomo

Last edited by oldalaskaman; May 7, 2011 at 08:36 PM. Reason: I really should proofread.
Reply
Old May 7, 2011 | 01:50 PM
  #3  
383vett's Avatar
383vett
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Default

Throw a cat in the system. It'll clean it right up. Replace it with a test pipe after you pass. This is nothing compared to what us Californians have to put up with.
Reply

Get notified of new replies

To Help me pass emissions...





All times are GMT -4. The time now is 11:00 AM.

story-0
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-1
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-2
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-3
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-4
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-5
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-6
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-7
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-8
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-9
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE