Dang inspection!!!

[POS Racing]

What causes High NOX Emissions

Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?

Among the potential causes of non-compliant NOx readings are:

Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Source - http://www.discountconverter.com

[jrj512]

sucks to admit this, but i dont know how to do that

Get a timing light from Harbor Freight and follow this: http://www.miata.net/garage/ignition.html

Note that since your battery is in the trunk, you might need to extend the lenght of the timing light cords or use a battery from a car parked next to the Miata.

[Rogue]

Note that since your battery is in the trunk, you might need to extend the lenght of the timing light cords or use a battery from a car parked next to the Miata.

Nope, use the blue "Aux power" plug in the pointy link.

[ozzie84]

Sorry for the dirty engine bay, but which vacuum hose do i use to introduce seafoam in my engine (91 1.6)

[Keifersmith]

Just get the seafoam in the spray can with the long plastic tube. you won't need to use a vacuum hose. plastic tube just inserts in front of the throttle body and intake hose just slides over it.

[sammm]

Use the one just to the right of what you have circled. No hose, just the rubber nipple.

[ozzie84]

Lol...i ended up returning the one i had for the spray, right before you commented...thanks though

[Sharpie]

Did you buy the blue miata with the polished hood that was for sale awhile back?

[ozzie84]

well it was painted gold, not the best job btw but i think it is the same one your talking about

[ozzie84]

Holy crap....I've never seen so much white smoke

[tailchaser]

Holy crap....I've never seen so much white smoke

You did it right...

[Rogue]

Its better when you do it at the mall, and cut some doughnuts.

http://youtu.be/h0gDnagI5to

[Petra]

Haha heck yeah!

[ozzie84]

Didn't pass again....

[POS Racing]

Didn't pass again....

Were the numbers any better??

[jrj512]

I could not pass a year ago. Bumped down the timing and ran some gas treatment that was supposed to guarantee a pass. Did not help. On my fourth try (second free one), I replaced my O2 sensor and passed.

I know your pain.

[trickyrix]

Sometimes it helps if you leave a 12 pack of beer in the passenger seat. Kind of like leaving cookies out for Santy Claws...

[ozzie84]

Just ordered a Catalic converter...and most prob will switch out spark plus this week...hopefully it will pass then

[ozzie84]

Just got this in the mail, about to head to auto zone abd get some new spark plugs and wires....hopefully i can take the test tomorrow

[Strider]

With Nox that hight it means your running too hot.