[DML] Re: catalytic converter question

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

You are correct, the catalytic converter cannot affect the NOx level.
You probably need a tune-up including cleaning the fuel injectors. I
would check the timing and make sure the mechanical AND vacuum advance
are working. Also you should use fresh gasoline of at least 91 octane
when you go for the test. Don't go on old, stale, low octane gas, it
mattters. Some of the additives are very volitile and evaporate out if
the gas is old so you should either burn it off or drain and refill
with fresh. Change the air filter too. You don't say how many miles
are on the car. You should check the Lambda circuit to be sure it is
functioning properly, you might need a new O2 sensor. After you tune
it up you should drive it a little before going for the test to burn
up all the HC remaining in the converter.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "rendycheng" <rendycheng@xxxx> wrote:
> Hi 
> 
> I just have a smog check done and my D failed.  I am located in
California. This test was 
> done at "test only" center, and the car was put on dyno.  The test
results are as follows:
> 
> RPM=2292 (at 15mph)
> HC_MAX = 141     HC_GP=331           HC_MEAS = 161
> NOX_MAX = 1148   NOX_GP   = 2270     NOX_MEAS = 2211
> 
> 




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