1993 Oldsmobile Cutlass Ciera "high nox reading emissions test" Questions

...high NOx reading during Emissions test causing me to fail emissions. Any ideas would be appreciated. Engine is a 3.3L 3300. This could be a couple different things . did they test ur fuel pressure? ...

...high nox 25 test 15 test hc 7 9 co .02 .13 no 1354 172 fails emissions test on the 25 test. allowable nox is 712 but i'm almost double. initially it had failed on both tests with readings in the ...

...high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help ...

a high NOx reading on gasoline vehicles is caused by a bad catalytic converter on your exhaust. I would suggest having this checked out before you try the test again. Hope this helps. Check the timing

...High NOx readings. HC are a result of unburned fuel in the exhaust and NOx is the result of high combustion temperatures and/or high combustion pressures. All 4 O2 sensors are new as is my fuel pump. ...

...High NOx readings. HC are a result of unburned fuel in the exhaust and NOx is the result of high combustion temperatures and/or high combustion pressures. All 4 O2 sensors are new as is my fuel pump. ...

...a 94 GMC Suburban and it wont pass the emission test cause the hydrocarbons are to high reading at 2.50 i changed the EGR valve but still no luck what are all the reading ??? ALL 5 ...

...High NO (NOx)? Nitrogen Oxide or NO is created when an engine's combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, ...

...high nox took my mitsubishi through CT emissions 4 times and failed everytime on nox only, my numbers dropped a little everytime with repairs until i put the new egr valve on then my numbers shot up ...

...high emissions in each category. I replaced the Catalytc Converter. It passes with the very best readings in all catagories, but FAILS IN ONE: the failing is with NOX reading at 15MPH. Please can you ...