I took my civic to get emissions done and here are the results

25/25 Test Reading----------Allowed
HC ppm----402--------------147 Fail
CO %------2.03-------------0.82 Fail
NOx ppm---1413------------1072 Fail
RPM--------2024------------3000 Max
CO+CO2----15.08-----------6.00 Min

50/15 Test Reading---------Allowed
HC ppm----364--------------152 Fail
CO %------1.40-------------0.85 Fail
NOx ppm---1453------------1186 Fail
RPM--------1860-----------3000 Max
CO+CO2----14.92-----------6.00 Min

what all should I change/use to get it to pass? sorry if this is the wrong forum


Georgia
95 civic Ex
d16z6

CEL is NOT on..

 

blah.... well lets start with what state your from, what car you have, year make model engine and mods and if there is a cel

 

Is the CEL ON? The engine seems to be running rich and the cat may be bad. When did you last replace the plugs, wires, cap, and rotor and set the ignition timing?

 

Georgia
95 civic Ex
d16z6

CEL is NOT on..

 

like ronj said start with a tuneup then. it appears either your engine isnt burning the fuel properly, or your catalytic converter isnt burning enough leftover fuel. hence your HC and nox is high....

 

OR move to a diff state that doesnt check emissions !! Its much easyer than trying to comply with them.. lol

 

well that wasnt very technical, or useful

Edit:

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WOOT this was my 1,000 post!!
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Ill be sure to start with the tuneup


I wish.. lol

 

anyone else? help?

 

Exhaust valve lash? maybe? IDK just a different guess.

 

Not technical but its an option. but for Technical help. Id remove any after market fuel pump. Replace your cat. and be sure both O2 sensors are working properly. But if there is no CEL then there may not be an O2 sensor problem. If you have a Walbro 255 then that cranks more volume of fuel in there at the same pressure. the pressure regulator only controls the pressure but the volume will still change depending on the liters per hour your fuel pump can handle. Check your sparkplugs and be sure that they are clean and the spacing is correct. If they arent burning as much fuel as they are supposed to that could be a problem. possibly get larger diameter sparkplug wires.
Perhaps an oil change may help also. fresh oil so the motor doesent have to work as hard to turn with old oil

 

riiiiiiight.... start witha tune up lol

 

Georgia does smog emissions???? i didnt know that. my answer to your prayers would be to try SEAFOAM. i heard its pretty darn good.