toptechx6

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.

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.

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.

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!!!

CTYANK2

I'm just reading off my State of Connecticut Emissions test results from April 2006. Here it is........

black_89_vette

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.

zr1fred

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.

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!!

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.

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?

NocarbutaVetteforme

I recently did the intake maifold gasket changeout for an oil leak and when I did I cleaned the whole intake pretty damn good. Well, once completed the car ran pretty damn good but just for *&%$ and grins I added some seafoam. It didn't smoke that much but I will tell you this, the car sounds like a new car. In fact it runs so damn smooth and the idle is incredible. I would what Bogus suggested and run a can of Seafoam through the car and see if it makes a difference. I still can't get over how much of a difference that can made. The car actually idles so quiet it is hard to hear it running if you aren't real close to the car.

sami85L98

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.

toptechx6

Thrak, sorry to hear the damned cat looks bad. Nice offer by sami85L98 who is close by, hope that helps get you passed. Let us know how the next test goes, best of luck.

Thrak

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.

anesthes

How do you know?

-- Joe

zr1fred

What's this seafoam?

CFI-EFI

Common sense. There is NO way one given car will have a smog standard in one state that allows less than one half of one percent the HC emissions, of the another state.

RACE ON!!!

CFI-EFI

This time it wasn't there again, but after I read this quoted post, I scanned back up and your test results showed up. A couple of points. I don't see the standards to the 1984, which I posted or the 1985, which Thrak posted. On what authority do you contend that 1984, 1985, and 1989 smog standards are the same? Also, maybe there is something I can't see on your test, but that looks like HC Limit, 88 PPM. NotAgain, unless your picture is not clear, the HC limit that you cite is 1\100th of the true limit.

RACE ON!!!

CTYANK2

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.

CFI-EFI

Not just Georgia. These are federal EPA numbers; not Georgia's, not Utah's, and not Connecticut's. Check! You will find that Connecticut has different limits for different years. Look at the different standards for my truck and my car.

Thrak posted 152 ppm HCs as the limit for the high speed test and 157 ppm as the limit for the idle test. Your NEW number of 88 is 58% of Thrak's high speed test, and 56% of his idle test limits. NOT less than one half of one percent of my limits.

"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!!!