[DML] Maybe Catalytic?
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[DML] Maybe Catalytic?



Hi Everyone
 
It's been a while since I've written the group.  I read through some of the
archives (lots of great information there), but I was hoping to get some
experienced minds on this one.
 
I recently failed my smot test (California), and the results were as
follows:
 
At 15mph
RPM - 1916
CO2 - 14.2
O2 - 0.1
HC - 141max, 45ave, 94meas
CO - 0.99max, 0.16ave, 0.94meas
NO - 1148max, 434ave, 45meas
Result - Pass
 
At 25mph
RPM - 1903
CO2 - 14.4
O2 - 0.5
HC - 113max, 33ave, 15meas
CO - 0.79max, 0.14ave, 0.00meas <--- this showed normal after a manual test
NO - 978max, 357ave, 1787meas  <<<<< problem - pass is 1100
Result - Fail
 
The technician went through a series of checks based on the results and he
suggested either the fuel injection or fuel pump not sending enough gas OR
the catalytic converter is no longer effective.  The Nitrogen Oxide readings
were high - everything else seemed fine.  The test results above were from
one run, we got the high NO readings on the second run - truly weird.
 
Reading through some of the previous threads in the list, I could actually
also blame additional things like:
    1. Gas in the tank is about 6 months old - haven't been driving it much
(this will change :-))
    2. I've been using 91 octane (many of you felt strongly about keeping it
at 87 octane).
 
Well, before I was thinking of doing a fuel injection flush, or at least run
a cleaner through the system.  Pipe out as much of the old gas as possible
and refill with 87.  Then finally look at the catalytic converter (maybe use
SpecialT's catalytic replacement).  Does this sound right to you guys?  Does
the catalytic converter (41k original miles) sound like the culprit here, as
recommended by the technician?  Thanks.
 
R
 
 
 
 


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