Sa.L.aS

Car is a 1992 honda civic si, has a JDM D16a on stock d16z6 p28.
has new cat converter, spark plugs etc,




standard
HC 1.89 1.00

Carbon monoxide 12.88 12.00

NOX 1.96 2.50

Former User

Which number is the limit and which is for your car?

Sa.L.aS

the limits are on the right, my cars results are on the left

Vtec95619

I Think The First Thing I Would Look At Is The Cat Converter.

Former User

Any CEL codes? It's running rich.

Things to look at:
-Plugs, wires, cap, rotor
-Ignition timing
-Thermostat stuck open
-ECT and O2 sensors

Sa.L.aS

Has a new cat on it.

Not throwing any cels, I reset the ecu a day before I took it to emissions, has new plugs, I havent changed the wires, cap or rotor, also has new thermostat

Former User

The items I mentioned are the place to start.

Do you have recommended NGK plugs installed?

How old are the wires, cap, and rotor? Have you inspected/tested them?

Is the ignition timing set to spec?

Ef8crxsi4u2nv

How new is the Cat? If its Brand spanking new you gotta break it in or you'll get a false reading. Supposed to drive around for a good 30-40 miles and when you retake your test, make sure you drive for 20 minutes to get it nice and warmed up. Try that and see if it works out, if not i'd do what everyone said.

Former User

The cat is not likely to be the problem because the NOx levels are low.

Ef8crxsi4u2nv

True. Good point

Sa.L.aS

the wires, cap and rotor came with the jdm motor lol, so I don't know how old they are, I bought the motor about 2 months ago from hmotors. I'm gonna check the timing tomorrow, need to buy a timing light.

Former User

You'd be wise to replace them before checking the ignition timing.