emissions and reducing HCO

[LETZRIDE]

Put the car on the rollers with the car not hooked up to the ministry to see if I would pass....car runs clean as hell for the driving test (made me feel great about my own tune) However the idle test my Hydo carbons are through the roof...limit is like 200 or so and I'm at almost 300...that was idling at stoich on the AFR, as well as we pulled the vacuum line and leaned it right out to about 17-18afr at idle and it didnt help any...

Anyone know how I might be able to get the HC count down?...

[ssms5411]

Re: emissions and reducing HCO

Put the car on the rollers with the car not hooked up to the ministry to see if I would pass....car runs clean as hell for the driving test (made me feel great about my own tune) However the idle test my Hydo carbons are through the roof...limit is like 200 or so and I'm at almost 300...that was idling at stoich on the AFR, as well as we pulled the vacuum line and leaned it right out to about 17-18afr at idle and it didnt help any...

Anyone know how I might be able to get the HC count down?...

Install a stock cam.LOL I don't know

[LETZRIDE]

Re: emissions and reducing HCO

well he did say it was def because of the cam lol....it was so f'n clean during the drive part though!! I damn near zero'd every column....

[techsan23]

Re: emissions and reducing HCO

It would be worth your while to do a little research on acetone as a fuel additive.

[bigbrian442]

Re: emissions and reducing HCO

Raise the idle RPM and retard the idle timing.

[dmw319]

Re: emissions and reducing HCO

how does the emissions testing there compare to here in the US?

[LETZRIDE]

Re: emissions and reducing HCO

Raise the idle RPM and retard the idle timing.

we manually raised the idle to max and I am only sparking 13* at idle...I dont know how much lower I can go?

It would be worth your while to do a little research on acetone as a fuel additive.

I've read about guys using methyl hydrate, but apparently that just lowers the NoX, not the HCO...unless acetone is different?

[bigbrian442]

Re: emissions and reducing HCO

Then a MSD DIS 4 would help clean up the idle.

[LETZRIDE]

Re: emissions and reducing HCO

Then a MSD DIS 4 would help clean up the idle.

is there a way to do coil per cylinder setup on our car with that?

[bigbrian442]

Re: emissions and reducing HCO

Explain what you mean by per coil set up.

[96RS Alex]

Re: emissions and reducing HCO

I improved my HC and NoX levels by installing a new catalytic converter and O2 sensor.

Another trick is to add a pint of denatured alcohol to a 1/4 tank of super unleaded as well before the emissions test.

Go with single electrode spark plugs versus those fancy 2,3,4 pronged spark plugs. Can't fool electricity, it follows the path of least resistance. I enjoy crisp starts with my AC Delco Iridiums.

[LETZRIDE]

Re: emissions and reducing HCO

Explain what you mean by per coil set up.

similar to an LSx setup I guess....6 coils, 1 per cylinder, rather than what we have right now which is 1 pack per 2 cylinders...

[2.8 Bird]

Re: emissions and reducing HCO

similar to an LSx setup I guess....6 coils, 1 per cylinder, rather than what we have right now which is 1 pack per 2 cylinders...

Ours operates on what is known as waste spark.

HCO usually means the cat is out.

[bigbrian442]

Re: emissions and reducing HCO

The Dis 4 doesn't have the ability to fire 6 coils.

[Mogobs30th]

Re: emissions and reducing HCO

is there a way to do coil per cylinder setup on our car with that?

Not possible considering the ICM and PCM are controlling only three coils. You need to find a way to control 6, and you're going to need more than just an MSD DIS-4. Wouldn't see the point unless you're building something insane....