Questions & Answers for: hc smog

smog test at 15mph 112 HC on the 25 mph 43 HC you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well,

...smog by having hc's and nox to high. my hc was 190 with 127 max and my nox was 2021 with 825 max. We had to have the calatic converter replaced. We did this after doing an oil change, air filter ...

...HC in smog test???? High HC means moisture in the system. Try driving it longer then take it to the smog shop. Otherwise it could be hard like a head gasket or easy such as a PCV not functioning. Any ...

...SMOG B'CAUSE OF HYDRO CARBONS(HC)&OXIDES OF NITROGEN(NOx)WHAT DO I HAVE TO DO TO PASS OR FIX IT?? IF DECELERATION FUEL REDUCTION SYSTEM IS NOT OPERATING, FUEL ECONOMY WILL BE REDUCED WHILE HC ...

smog hc too high the truck failed a smog in california with hc levels at 146, 126 was acceptable. It passed at 15 mph, failed at higher rpm test. what do I do to start? About the only thing you can do

...smog HC 249 (max138) CO 1.37 (max0.59)at 15mph - HC 147 (max)109 CO ok at 25 Rellaced both O2 sensors,TPS, intake air temp sensor, water temp sensor, PCV valve. At about 1200rpm O2 sensor still reads ...

smog failure High HC's only issue tacoma 3.4 v6, 250,000 miles. last smog 2 years ago barely passed the low idle HC, this year it failed the low and barely passed the 25mph test? I can attach actual ...

smog) of HC 1.00 CO%1.50 Because you failed to have a shop look at the data & make the required repairs & get caught up on preventative maintenance BEFORE you went to inspection If you were in

...smog for high hc levels st idle . what should i do before i take it back to try and smog? ive already done complete tune up. as long as you have no check engine light on change oil, air filter. pep ...

...smog in California. Fails HC at idol, everything else passes, please help The easiest way to reduce HC at idle is to retard the timing a few degrees. You might have to increase the base idle and you ...