hi all
i have 1987 GTA 5.7 new wires, plugs, oil change around 2k ago. new KN air filter, new O2 sensor and some G2P, used 87 octane drove car around 30 mins before inspection. any suggestions?????

 

How Old Does A Vehicle Have To Be Before It Is Exempt From Emissions In Your State.

 

i believe its pre 1960. my friend still has to get his 69 camaro tagged every 2 years

 

Your picture tells us nothing to help you.

 

thats all De gives u. I failed low Co, the state wants 1.20 to pass. i have 1.34, thats all the pic was indicating

 

CO too high means it's running rich.

Common things to check.
Dirty air filter - you changed it
Faulty O2 sensor - you changed it
Defective MAP sensor - Do these cars even have one?
Defective TPS
Defective Coolant Temp Senor. An engine running too cold will run rich. If in doubt, try putting a 195 thermostat in the engine and retest. All modern cars run hot mainly to reduce emissions.

 

thanks. i get a random code 14 every few miles...i think thats the CTS..maybe i should change it.. its a quick fix

 

Fix the CTS. Then if you just want to get it to pass, in your case, without actually repairing the problem, add 1 quart of denatured alcohol (get at HD or Lowes) to the fuel tank (1/2 tank of gasoline). The CO reading will go to ZERO.
If that is the only thing that made you fail, then you will pass.
But you really should fix it correctly.

 

yes thats the only thing. i read some threads where people put a gallon of 91% alcohol. didnt think that would actually work

 

I have done it for years. 1 quart is all you need.
I also ran leaded fuel in my unleaded vehicle after removing the catalytic converter.
But this was decades ago.

 

ill give it a try, why denatured alcohol?

 

It is what a neighbor told me many, many years ago.
It worked and I've been doing it ever since.
Buy a gallon at Home Depot and your are good for 4 tests.
But you should really repair the problem. This buys you time.

I used to drive to emissions and go past the station to the end of the dead end road.
Then I would add the 1 quart of denatured alcohol to the tank, let it run for a few minutes, and
as I drove back to the test station I would turn the steering wheel left and right to stir the gas tank.
By the time they actually stuck the probe in the tailpipe, it was plenty of time to work.
With the alcohol, the highest CO reading I ever saw was .01

 

yes, i plan on swapping out the stat for 195 and change cts. just want it legal for now

 

put a new cat on it, youll pass no issues

 

A gallon of alcohol in your fuel tank is way to much. A quart/liter of methanol, methyl hydrate, wood alcohol etc (all the same thing) in a full tank of fuel is more than enough.

You can buy a quart of methyl hydrate at any home improvement store plus walmart and just about anywhere else that sells paint or solvents. Buying it in small quantities like this is expensive but if it's an emergency and I need race fuel, it will do just fine. I buy methanol in 205L barrels since that's what I use for race fuel.

I've heard of methanol burning pro street cars going to get emission testing in Vancouver. They pass with flying colors however the methanol exhaust fumes contain formaldehyde which is poisonous and the fumes burn your eyes. As much as everyone hates the smell inside a building, it passes emissions. I can't fire up my engine without opening the garage door first and even then, I need a cross breeze.

 

I do want to replace the Cat as well but that wont be for another few weeks. trying to get a lil driving time in before winter hits. Well legal riding that is

 

a quart of denatured alcohol with a 1/2 tank of regular gas. unfortunately didnt do the job. once i get my money right, ill get cat and cts
thanks all

 

What were the new test result numbers?

 

i will have to go get the paper and report back