Just Failed CA Smog. Now what?

[Hib Halverson]

Originally Posted by Okiedoke

What is ECT?(snip)

Engine Coolant Temperature.

[Z51JEFF]

I'm thinking about going on the 1st if anybody wants to meet me there.

[glkuntz]

Originally Posted by Z51JEFF

I'm thinking about going on the 1st if anybody wants to meet me there.

By there do you mean the Blackhawk Cars and Coffee? If so I plan on being there. I usually arrive by 7 in order to get a spot in the upper lot.

Gary

[Z51JEFF]

Originally Posted by glkuntz

By there do you mean the Blackhawk Cars and Coffee? If so I plan on being there. I usually arrive by 7 in order to get a spot in the upper lot.

Gary

That's the one Gary. You wouldn't happen to own a Black 91 would you?

[glkuntz]

Originally Posted by Z51JEFF

That's the one Gary. You wouldn't happen to own a Black 91 would you?

Nope, Red, Black interior.

See you there. What color is yours?

Gary

[Okiedoke]

Originally Posted by Okiedoke

The failed report:

I changed out the O2 sensors, engine oil, and went to the smog place recommended by my mechanic with the engine hot and I passed!! I don't think the O2 sensors did anything for NOx. The 25 MPH measurement actually went up from 459 PPM to 519 PPM. The average is 223 PPM. If anyone knows why my NOx is still so high and how I could get it down, I'm really curious to know. All of the other measured numbers are all below the average.

I think what made the difference is not anything I did to the car but in the values entered for the smog test! The previous smog place put "CORVETTE" instead of "CORVETTE ZR1" as the Model. They also entered this as a "California" instead of "Federal" car in the Certification field. Entering these values correctly actually raised the NOx MAX levels from 545 PPM to 757 PPM (for 15 MPH) and from 502 PPM to 696 PPM (for 25 MPH).

The passing report is below:

[Coupe89]

Hummm...... interesting......

Glad you passed

[mike100]

Originally Posted by Okiedoke

...

I think what made the difference is not anything I did to the car but in the values entered for the smog test! The previous smog place put "CORVETTE" instead of "CORVETTE ZR1" as the Model. They also entered this as a "California" instead of "Federal" car in the Certification field. Entering these values correctly actually raised the NOx MAX levels from 545 PPM to 757 PPM (for 15 MPH) and from 502 PPM to 696 PPM (for 25 MPH).

This is huge...I will double check my previous tests to see how it was tested.

As for the high Nox. Probably a small vacuum leak or old catalysts.

[glkuntz]

[QUOTE=Okiedoke;220729]I changed out the O2 sensors, engine oil, and went to the smog place recommended by my mechanic with the engine hot and I passed!! I don't think the O2 sensors did anything for NOx. The 25 MPH measurement actually went up from 459 PPM to 519 PPM. The average is 223 PPM. If anyone knows why my NOx is still so high and how I could get it down, I'm really curious to know. All of the other measured numbers are all below the average.

I think what made the difference is not anything I did to the car but in the values entered for the smog test! The previous smog place put "CORVETTE" instead of "CORVETTE ZR1" as the Model. They also entered this as a "California" instead of "Federal" car in the Certification field. Entering these values correctly actually raised the NOx MAX levels from 545 PPM to 757 PPM (for 15 MPH) and from 502 PPM to 696 PPM (for 25 MPH).

I'm curious how the smog guy got away with using Federal instead of California certification. It's a Ca car is it not? The 49 state Federal standards are no doubt less strict than Ca. which is potentialil why the Max limits were higher, about what they used to be in Ca.

I sure hope you actually get your registration and that I can convince a local guy to do the same.

Gary

[Franke]

Would the difference be that cars SOLD in CA would be equipped somewhat differently than cars sold in the other states and therefore would have different emission requirements? For example I once saw a CA car that had 2 evap canisters in it vs the same model non CA that only had one.