1991 Volvo 940 "failed co emissions" Questions

...failed on two things and passed on the third thing what were the specific inspection details like Co, 02, CO2 and NOx readings? furthermore, have you done any maintenance like fuel filter, oil change ...

...CO and HC levels. It failed emissions test with hi CO and HC levels. What are the most common emission issues with these vehicles. Not sure, but did you replace the oxygen sensors. Is your catalytic ...

...CO FAILED SMOG EMISSIONS HIGH CO I would replace CATalitic converter, this car is old, plus a tuneup is 100% necessary , spark plugs wires, ditributor cap & rotor, plus both the air & fuel ...

...as the 'smog test'? If you have a problem with excess CO emissions on a car the cause is often an incorrect fuel/air mixture or a faulty sensor called the lambda/oxygen sensor in the exhaust ...

retested and failed again High speed HC 353 CO 4.16 Low speed HC 738 CO 3.86. I think the timing might be off a little. What would cause my emissions to get worse? MAP sensor needs cleaning or is bad

...Failed Emissions HIGH CO again i have changed the cat converter,Air Filter,Oxygen Sensor,MAP sensor,Throttle Position Sensor ,Engine Coolant sensor, Thermostat(195), coil, rotor,cap, plugs AND STILL ...

...failed emissions test co was to my 1992 Ford f150 failed emissions test, co was to high. tune was just done. Could I just service the fuel injection system to fix the problem, or replace the evap ...

...Co is above 3000. Apart from being a 30 year old gas guzzler with 500,000 miles on it :>D There are three situations where emissions requirements may temporarily be extended or waived: Emissions ...

CO(%)MAX 0.51/AVE 0.10 /MEAS0.91 / NO(PPM) MAX 490 / AVE. 165 / MEAS 292 RESULTS FAILED 25MPH /RPM 1911 / %CO2 MEAS 14.2 / %O2 MEAS 0.0 / HC(PPM) MAX 36 / AVE 16 /MEAS 106 / CO (%) MAX 0.51 / AVE 0.09

...emissions mot results co 5.508 % hc,s 250 on idle Replace your oxygen sensors.               murf427 Help please guys Low idle ...