my 93 civic failed emission. need help.
i failed texas emission test due to super-high nox reading. does anyone have suggestion. here are the reading.
25 mph 15 mph HC: 167/54 pass 173/80 pass CO: 0.94/0.02 PASS 0.97/0.02 pass Nox: 1240/2899 fail 1372/3036 fail please help asap. |
What mods are done to the car?
And if it has the stock engine what is it?(if you don't know just post the trim level of your car) |
Is the CEL ON?
High NOx levels indicate that the engine is running hot or lean or that the cat is bad. As your engine appears to be running lean, check the O2 sensor, the fuel pressure regulator, and the fuel pressure. |
Among the potential causes of non-compliant NOx readings are:
Misfire condition Malfunctioning or improperly adjusted EGR valve Failed oxygen sensor Leak in exhaust tubing upstream of converter Excessive carbon deposits in combustion chamber Improper spark advance Blocked coolant passage Overly lean air-fuel mixture Damaged cold air duct Failed or malfunctioning catalytic converter Corroded or damaged engine sensor electrical connections |
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