What does low CO2 mean on a car test?
So low CO2 can mean rich or lean. FWIW in my vehicle emission testing region (Seattle WA) this engine would pass a tailpipe emission test. Refer to the graph below for with help with gas value interpretation. The left side of the chart is rich and the right is lean. Of the list of possible failures the MAF is a possible cause of a rich condition.
Can a FWIW engine pass a tailpipe emission test?
FWIW in my vehicle emission testing region (Seattle WA) this engine would pass a tailpipe emission test. Refer to the graph below for with help with gas value interpretation. The left side of the chart is rich and the right is lean. Of the list of possible failures the MAF is a possible cause of a rich condition.
What are the results of the HC and co test?
The test results are summarized below: Essentially, HC and CO are far too high while NO is fairly low. Also, CO2 is low, indicating lean conditions. What are some possible causes, and some ways to investigate them, that could cause the test results?
What causes high hydrocarbon ( HC ) in a fuel?
What Causes High Hydrocarbon (HC)? Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition.
What should I do if my smog test is high?
If your CO or HC is high you could lean out a bit with your afc. If your NOx is high you should richen it up with an afc or other contorller. You can do this after your test, most test onlys allow a free retest if you fail.
What makes a car pass the smog test?
Most cars will pass this functional test as long as you still have your stock ECU and you don’t have any check engine codes (no CAT?) and if you haven’t reset the ECU by unplugging the battery (you need to have you emissions components to be monitored explained later). Also for awd cars they test the EGR so you need to have that as well.
Can a smog machine erase a check engine code?
You also can’t just erase check engine codes and lights. Smog checks requires the smog machine to communicate with the ECU thru OBD2 port.
So low CO2 can mean rich or lean. FWIW in my vehicle emission testing region (Seattle WA) this engine would pass a tailpipe emission test. Refer to the graph below for with help with gas value interpretation. The left side of the chart is rich and the right is lean. Of the list of possible failures the MAF is a possible cause of a rich condition.