failed emissions again... suggestions?
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
weight vs percentage
The grams per mile measurement seems harder for me to understand than percentage, probably because all shop equipment uses PPM and it is hard to visualize the weight of a gas. I'm told when correcting to that standard for repairing failures the first step is to run a baseline with your 5 gas analyzer, then just work for improvement since you cannot measure directly in GPM.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by CFI-EFI
In my state, at least, the standards vary with the year of the car. That is why the standard for the '78, HD, truck are so much higher than the '84, car. The standards for for an '85, here, may be the sames as Thrak has to meet. Second, it is pretty obvious that your standards, at least the HCs, are expressed in different units of measure (grams per mile?). The HCs we are discussing are in parts per million (ppm). The CO is stated as a percentage (%) of all the exhaust gases. I don't know what the units of measure of Thrak's NOx standards.
RACE ON!!!
RACE ON!!!
As for the corvette in question... It is running fat, but why is a good question. I would scan that thing, and watch what the O2 is doing.
Also, if the valves are gummy, they may be causing some leakage. You may try running a can of SeaFoam through it. It won't hurt, and it might help.
Take a can of carb cleaner, and hit each of the various intake joints to check if there are leaks... if so, the engine will idle up.
As suggested, check timing.
Le Mans Master
Joined: Jan 2003
Posts: 6,187
Likes: 309
From: SIMSBURY CT
St. Jude Donor '07 thru '25
Originally Posted by CFI-EFI
In my state, at least, the standards vary with the year of the car. That is why the standard for the '78, HD, truck are so much higher than the '84, car. The standards for for an '85, here, may be the sames as Thrak has to meet. Second, it is pretty obvious that your standards, at least the HCs, are expressed in different units of measure (grams per mile?). The HCs we are discussing are in parts per million (ppm). The CO is stated as a percentage (%) of all the exhaust gases. I don't know what the units of measure of Thrak's NOx standards.
RACE ON!!!
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CTYANK2
HC and NOX here in Connecticut are definitely PPM. C0 is a % but I can't say for sure if it is a % of total gases.
RACE ON!!!
Le Mans Master
Joined: Jan 2003
Posts: 6,187
Likes: 309
From: SIMSBURY CT
St. Jude Donor '07 thru '25
Originally Posted by CFI-EFI
Are you saying that if I moved to Connecticut, my 1984 would have to have HCs no greater than 0.88 parts per million, where the federal, and my current state standards are 220.00 parts per million? That means my new standard would 4 tenths of one percent (.88 ÷ 220 = 0.004 or .4%) of my current standard... for the same car. Excuse me, if I say, I don't believe that.
RACE ON!!!
RACE ON!!!
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
If your 85 is the same as my 89, just disconnect the ESC wire by the brake booster. This will run your engine at base timing without computer control.
This little trick works wonders.
This little trick works wonders.
Race Director
Joined: May 2006
Posts: 10,691
Likes: 71
From: Phoenix Arizona
We've had emissions here for 20+ years, and the FIRST thing we look at is the cat. If the car runs good and there is no check engine light, and if the cat is over five years old, it's probably the cat.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CTYANK2
I'm just reading off my State of Connecticut Emissions test results from April 2006. Here it is........
RACE ON!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Le Mans Master
Joined: Jan 2003
Posts: 6,187
Likes: 309
From: SIMSBURY CT
St. Jude Donor '07 thru '25
Originally Posted by CFI-EFI
I can't read it. It didn't show up. It shows the standards for a 1984 car as that low? You know that the allowable standards DO change from time to time? I have heard of 49 state (federal) standards, California standards, but never the "Oh my goodness, Connecticut standards". Regardless of what you are reading or have to post, what you have stated is in error.
RACE ON!!
RACE ON!!
Thread Starter
Racer
Joined: May 2005
Posts: 360
Likes: 0
From: Canton GA
Well, I got under the car tonight, and low and behold.. the pipes after the cat are a normal red/rusty color... the front left and right downtubes are the same color, but where they meet (about 8-10" before the cat) is ALL freakin charred black... I mean it looks like there was a fire under it, that kind of black.
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Last edited by Thrak; Jul 30, 2006 at 11:21 PM.
Drifting
Joined: Jun 2002
Posts: 1,945
Likes: 41
From: Corinth TX
Originally Posted by bogus
it sounds like your state is following the federal standards... 1981 had a change in those standards, so pre 81 were higher.
As for the corvette in question... It is running fat, but why is a good question. I would scan that thing, and watch what the O2 is doing.
Also, if the valves are gummy, they may be causing some leakage. You may try running a can of SeaFoam through it. It won't hurt, and it might help.
Take a can of carb cleaner, and hit each of the various intake joints to check if there are leaks... if so, the engine will idle up.
As suggested, check timing.
As for the corvette in question... It is running fat, but why is a good question. I would scan that thing, and watch what the O2 is doing.
Also, if the valves are gummy, they may be causing some leakage. You may try running a can of SeaFoam through it. It won't hurt, and it might help.
Take a can of carb cleaner, and hit each of the various intake joints to check if there are leaks... if so, the engine will idle up.
As suggested, check timing.
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
Originally Posted by Thrak
Well, I got under the car tonight, and low and behold.. the pipes after the cat are a normal red/rusty color... the front left and right downtubes are the same color, but where they meet (about 8-10" before the cat) is ALL freakin charred black... I mean it looks like there was a fire under it, that kind of black.
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Thrak, i bought cat from mid america for my 85 vette and its basically like a OEM style i did not see anything hig perf in thier CAT, infact i compared it side by side with RT cat, a huge big diff the honey comb holes were bigger in RT cat than Mid america, When i changed my original CAT man it was so dirty and it was in pieces chunk pieces from inside. If u would like to borrow mine not a problem only if u have a 85 vette, mine fit only 85 vettes. Give me a call 404 822 8070 there is one on fairburn rd, douglasville X 34 on I 20. i know that guy he probably help u out in this case.
check my sig for mods with mid america CAT i passed GA emmission recently.
sami.
Last edited by sami85L98; Jul 31, 2006 at 03:58 AM.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Originally Posted by Thrak
Well, I got under the car tonight, and low and behold.. the pipes after the cat are a normal red/rusty color... the front left and right downtubes are the same color, but where they meet (about 8-10" before the cat) is ALL freakin charred black... I mean it looks like there was a fire under it, that kind of black.
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Looks like its the cat... so what brand do you guys suggest for a basically stock car, that wont break the bank?
Thread Starter
Racer
Joined: May 2005
Posts: 360
Likes: 0
From: Canton GA
Awesome Sami!! I'll be giving you call this evening! 
I've been a seafoam user for years... use it in all my cars. I'm very well aware of how awesome a product it is. I've already ran 2 or 3 cans thru it (intake, gas tank, oil, etc) so that motor is really clean haha.
Thanks for everyones help! I'll update after the next test.
I've been a seafoam user for years... use it in all my cars. I'm very well aware of how awesome a product it is. I've already ran 2 or 3 cans thru it (intake, gas tank, oil, etc) so that motor is really clean haha.
Thanks for everyones help! I'll update after the next test.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by anesthes
How do you know?
-- Joe
-- Joe
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CTYANK2
The test was on my 89. If you can't see the picture I posted send me a PM with your e-mail address and I will e-mail it to you.
Originally Posted by CTYANK2
Well at least the emission standards there are reasonable. Limits here in Connecticut are:
HC: 0.88
CO: 0.28
Nox: 614
HC: 0.88
CO: 0.28
Nox: 614
RACE ON!!!
Le Mans Master
Joined: Jan 2003
Posts: 6,187
Likes: 309
From: SIMSBURY CT
St. Jude Donor '07 thru '25
Opps, I see it now, typo! My original post should have been 88, not 0.88 for HC's. Also, I guess you are saying there are different limits for 84 and 89 Corvettes in Georgia but I am unaware of any distinction like that here in CT.
88 is about 40% lower than what Thrak posted for Georgai HC limit (152 or so). Anyway, the original point, and only point, is that the levels here are much stricter than Georgia.
88 is about 40% lower than what Thrak posted for Georgai HC limit (152 or so). Anyway, the original point, and only point, is that the levels here are much stricter than Georgia.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by CTYANK2
Also, I guess you are saying there are different limits for 84 and 89 Corvettes in Georgia but I am unaware of any distinction like that here in CT.
Originally Posted by CTYANK2
88 is about 40% lower than what Thrak posted for Georgai HC limit (152 or so). Anyway, the original point, and only point, is that the levels here are much stricter than Georgia.
"Anyway, the original point, and only point, is that the levels here are much stricter than Georgia.". I don't even believe THAT. I don't know the standards for either state, but I'll bet you're wrong. I WILL agree that the standards for his 1985 are not as strict as they are for your 1989.
RACE ON!!!