failed emissions again... suggestions?
#21
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.
#22
Team Owner
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.
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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.
#23
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
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.
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#24
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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.
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#25
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
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.
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#26
Melting Slicks
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.
#27
Race Director
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.
#28
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Originally Posted by CTYANK2
I'm just reading off my State of Connecticut Emissions test results from April 2006. Here it is........
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#29
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
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.
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#30
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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; 07-30-2006 at 11:21 PM.
#31
Drifting
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.
#32
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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; 07-31-2006 at 03:58 AM.
#33
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?
#34
Racer
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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.
#37
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Originally Posted by anesthes
How do you know?
-- Joe
-- Joe
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#38
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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
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#39
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St. Jude Donor '07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
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.
#40
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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.
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