Passing Smog Test.

[reelizmpro]

I was being sarcastic in my post since the OP offered no specific details. I feel those not in CA should keep in mind that our emissions limits are very low and running cat less is NOT an option. Also, very few e30's are still running the stock center sections due to leaks and therefore not running the stock cats but aftermarket ones which have been known to fail prematurely if the engine is running too rich or lean. So yes, check your cat or cats and make sure it's functioning and not blown out.

[Cliche Guevara]

What is the best solution to this problem?

Move to Eugene, no smog or inspection of any kind ever.

[Mo_E30]

Here is the update:

I spoke to my mechanic once again and he told me that he is 99.9% sure that the failed emissions test was likely due to the old OEM cats. Keep in mind that my car has over 317,000 miles on it. He recommended me a muffler shop to have it replaced, which I did. I then returned back to the Dyno and passed it with ease. The only other thing I did was to add 91 Octane and drive for twenty minutes prior to the test.

Here are the numbers:

Before


After


:up:

[Jean]

Those are stll high numbers for NO even after you replaced your cat, what brand is the CAT you used at the muffler shop?

Congrats on passing.

[reelizmpro]

Yeah I agree. My fresh cat had low double digit numbers for No

[LowR3V'in]

My first turbo setup I used #24 injectors without touching the afm
and the guy said he'd smog it if it passed it passed.

It passed! with a $100 muffler shop cat.

[GDA]

Uh, don't agree with that analysis. You have O2 left over after combustion and post CAT. O2 showing up in the analysis is the result of incomplete combustion. Probably an intake leak, vacuum leak or weak spark on one cylinder.

The fact that you pass on high speed is a very strong indicator that your CAT is working and is displayed by how your O2 and CO goes down with higher exhaust velocity speeds in the high speed test.

Also, even without CAT you should be targeting 14.5 or higher for CO2 which should mirror stoich as the indicator of complete combustion so you are quite weak on that level pre CAT.

[2mAn]

Im a little worried to bring my ETA to California with me if I end up moving back

[Jean]

Yeah I agree. My fresh cat had low double digit numbers for No

Yep, pretty shitty numbers above. OP- what was the make/model of the cat used so we all know what to avoid LOL ?

[monkeyodeath]

Dude, you're running lean and hot. NOX is sky high (esp. with a new cat) and CO (unburnt fuel) is super low.

Check for vacuum/intake leaks, fuel pressure, clogged injectors. Make sure engine isn't running hot due to cooling system problems.

[reelizmpro]

Dude, you're running lean and hot. NOX is sky high (esp. with a new cat) and CO (unburnt fuel) is super low.

Check for vacuum/intake leaks, fuel pressure, clogged injectors. Make sure engine isn't running hot due to cooling system problems.

You beat me to it. I agree, considering the high numbers for a new cat even driven 20 minutes. HC/CO is well below average and plenty of room for enrichment. Fix your vacuum leaks especially around the throttle body where there are several press fittings and hoses. Get it fixed before you ruin your new cat.