pnoipj89

so im at the dmv trying to get my car to pass inspection and it fails first of high hc, i was able to fix that problem now.. but now when i went back to have it re inspected, it now fail for high co levels.. my car is a completely stock engine, no swap in it... can anyone tell me how to reduce the co levels...

rick_rabies

put a super restrive exhaust on it. go test. pass. come home and put your good exhaust on

Former User

The air-fuel ratio may still be a bit rich.

Jimster480

What mods do you have on it?

John/Cue\Publik

too much carbon monoxide is usually from actually being too lean high HC is too rich

Former User

That's backwards. High CO in the exhaust is an indicator of incomplete combustion, which generally occurs when the air-fuel ratio is too rich.

pnoipj89

my car is completely stock on stock.. stock engine with stock exhaust system.. yea ronjaht is right about that.. that high co is an incomplete combustion.. but i need ideas on how to lower co.. i already put new spark plugs in... which help it lower it down to 1.21 which i need a 1.20 to pass emissions for co... i already had the injectors cleaned out couple days before the re inspection.. i just need to hit 1.20 or lower to pass..lol..

Former User

Post the entire emissions report.

You replaced the plugs, but what about the wires, cap, and rotor? Have you checked the ignition timing with a timing gun?

Any CEL codes? Is the engine running cold? Do you have an exhaust leak?