Didnt pass Inspection due to emmissions

[95BadMotorScooter]

I just had new o2 sensors put in and took the hypertech promgram out of the car and it still failed miserably. I have long tube headers, but i believe there street legal, they have all the emmissions stuff necessary. I still have a cat and i just did a tune up no more than 5000 miles ago and did a new opti about 500 ago. I've also replaced my egr valce recently? I was wondering if maybe wait a week to have it recalibrate itself, put some good gas in it and some additives. Think that'll work?? or any other ideas??

[Mark B]

Welcome to my world. I am working on getting my 91 to pass right now. Had the same problem last year.

What part of the emissions test is it failing? NOx, CO2, etc.

[Disifer]

I don't think any longtubes are emissions compliant. They may have AIR and EGR hookups but they're not smog legal.

[LarryMow]

is california the only state that actually test emissions for the inspection stickers? mississippi only tests lights, horn, blinkers, and windshield....im guessing you guys are in cali.

[ryan34]

With long tubes, they move the position of you cats. Which is illegal. So if they did a visual inspection, then you probably failed. I would guess you either have to put you stock manifolds back on, get it inspected, then put the long tubes back on....or go with mid-lengths.

good luck either way you go

[bru333]

is california the only state that actually test emissions for the inspection stickers? mississippi only tests lights, horn, blinkers, and windshield....im guessing you guys are in cali.

There are plenty of other States that do a sniffer test. Some (like CA and NJ for example) use a tredmill/rolling road and test at speed. Here in NC only newer (OBDII) vehicles get tested, and only in certain counties.

[Kevin - Blown 95 TA]

I just had new o2 sensors put in and took the hypertech promgram out of the car and it still failed miserably. I have long tube headers, but i believe there street legal, they have all the emmissions stuff necessary. I still have a cat and i just did a tune up no more than 5000 miles ago and did a new opti about 500 ago. I've also replaced my egr valce recently? I was wondering if maybe wait a week to have it recalibrate itself, put some good gas in it and some additives. Think that'll work?? or any other ideas??

That's not enough info for anyone to help. Post your test results. What parameter failed you? What cat do you have?

[Joshu]

is california the only state that actually test emissions for the inspection stickers? mississippi only tests lights, horn, blinkers, and windshield....im guessing you guys are in cali.

Here in Pennsylvania it is only in the major cities that you need to pass an emissions test...like where I am (Allegheny County, Pittsburgh)

[95BadMotorScooter]

HC 1.89 needs to be 1.2 Failed
NOx 3.79 needs to be 2.5 Failed
i have a flowmaster high flow cat

[Trash man]

hc is hydro-carbons aka fuel, ur running rich. nox is cause by high combustion temps

[Injuneer]

I'd be more inclined to blame the cats..... high HC is generally produced by a rich mixture, but a rich mixture will reduce NOx. NOx comes from a lean mixture. High HC and high NOx would appear to be related more to a weak or failed catalytic converter.

[Kevin - Blown 95 TA]

Agree with fred - do you have an aftermarket cat? or a stock OEM one?

[95BadMotorScooter]

Aftermarket Flowmaster high flow

[Kevin - Blown 95 TA]

I would guess that is your problem. I failed twice miserably with my Random hi flow. I stuck my stock cat back in there for the third test and passed with 10X better HC, 5X better CO, and 2X better NOX.