California Smog Test Only procedures

[miklos]

I just went and failed for high Nox.

But is the smog tech supposed to pinch off the canister hose when running the emissions test on the dyno and with the hood closed-which makes the engine run hotter?

[xpertsnowcarver]

Yes. But that's not going to cause an increase in NOx. Do you know how your canister purge system works?? If you don't, go find out.
Closing the hood to your engine, isn't going to make a difference either, less you have some ridiculous cooling problems.
Your car failed for the simple fact that its old. There's tons of things you can do to resolve your issue, but we both know this has been covered countless times. If you would like to make it pass again, be ready to do a lot of maintenance work.

[Tantwoforty]

yup... iv been trying to pass for months lol