Originally posted by yapper:
"Gasoline consists of hydrogen and carbon atoms, thus levels of hydrocarbon represent unburned fuel in the exhaust. Mistakenly thought of rich air/fuel(A/F) mixture, HC is known as a misfire meter. HC levels escalate when the engine is not experiencing complete and efficient combustion. Residual HC is created by ignition problems, excessively lean A/F mixtures, camshaft design, and excessive crevice volumes or carbon deposits in the combustion chamber."

So my point is to double check the ignition and the fuel delivery systems before maybe needlessly replacing your cat(s). BTW before replacing my DPFE and doing some other stuff only my NOx levels were elevated.

1st attempt CA emissions test results
@ 15mph 14.91 CO2(%)
0.02 02(%)
9 HC (ppm) (55 max)
0.01 CO(%) (0.50 max)
935 NOx (ppm) (437 max)FAILURE

2nd attempt CA emissions test results
@ 15 mph 14.9 CO2
0.1 02
7 HC
0.01 CO
44 NOx

I think this shows that HC should be alot lower than 220ppm.




Prior to all the work the HC level was over 1800. After all the work it ranges around 230. I need the HC to be under 220 on idle to pass smog.

Spark Plugs
Injectors
Carbon build up
And maybe the Battery I have a 540 amp one in the car right now and my air bag light flashes 3 time then stops for a sec and flashes 3 times again.