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DISCUSSION => Engine + Driveline => Topic started by: eric16v on April 22, 2011, 05:47:55 PM

Title: SMOG fail
Post by: eric16v on April 22, 2011, 05:47:55 PM

So I went in for a Smog test and failed at 15 mph.

I used that online calculator and found my car is running a bit rich.

Plugs are about two years old and look good. Slight tan color. COP kit installed.
Installed new universal o2 sensor two years ago for smog. new cat 2 yrs ago to pass.
oil change before test
Also Im running a MarkD 91 oct chip. And I have ford injectors to install.
here's the #'s
  15 mph          
 CO2     O2      
14.9      .2        
      HC
max  :  meas
 124  :  154      FAIL
       Co
 .78   :  .35
       No
815    :  1088   FAIL

What should I check for that might make it run rich? I put my MM to the Engine Coolant Sensor and it is within specs.
Is there a way to check the AFM?

Last test i put a new cat and this dropped the #'s drastically but I want to get this thing running right so I don't need a cat every two years!
Maybe I didn't get the cat hot enough?

TIA

Title: SMOG fail
Post by: KenC on April 23, 2011, 08:58:31 AM

Make sure the engine and cat are both hot before starting the test. Looks like you're high on hydrocarbons and NOx.
If it was warmed up when you did the test, you probably need a new cat and O2 sensor.