So.... trying to get GA Emissions done to renew my tag, and I failed.
It's an 88 Lude with 166K mi
This is the reading I got

25/25 50/15
Test Read Allow Result Read Allow Result
HC-ppm 0031 181 Pass 0029 187 Pass
CO% 0.43 1.16 Pass 0.40 1.05 Pass
NOx-ppm 2197 1313 FAIL 2378 1438 FAIL
RPM 2955 1.5-3K Pass 2920 1.5-3K Pass
co+co2% 14.7 6.0 min pass 14.7 6.0 min pass

catalytic converter preset, gas cap seal pass.


help?!?!?!?

 

Time for a new cat

 

negative.... it's less than 3 years old

 

High NOx is usually from a bad egr, if they had those that long ago If so, open it up and clean it out good!

 

Time for a new car then.. if you wont listen to him about replacing your cat. just because you replaced it 3 years ago doesnt mean it is not bad. Your cat lowers your Nox, if you failed nox that is the first place to start looking....


did the 88 prelude even have egr??

 

clean out o2 sensor?>or do 3rd gens have those...

 

no one knows anything about 3rd gens here apparently.. and neither do i

bump for an answer. hope ya get some help

 

assuming ur 88 lude is fuel injected and not carb'd....

high nox is caused by higher than normal temps during combustion, caused by egr not functioning properly (if ur car has one), car running lean (change out plugs/wires/cap/rotor/run injection cleaner), check sensors like MAP, IAT, etc. to make sure they are giving the ecu proper readings to determine the correct amount of fuel, the cat COULD be shot however if it was you would be failing CO2 99% of the time, since youre not failing CO2 it most likely is not the cat

 

run seafoam on your car

 

start with the EGR system