[DML] Re: Maybe Catalytic?
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[DML] Re: Maybe Catalytic?

I am also in CA (Southern) and had the same problem when I brought 
my car in from Colorado. I kept failing NOx. Things I ended up 
replacing: Cat (with SpecialT replacement) Tune-up, O2 sensor. I 
retested after this and STILL failed. I took the car to the guys at 
DMC in Garden Grove and they had their smog guy run the car. Before 
they took the car in they re adjusted the fuel mixture to bring it 
into spec. I ended up passing. In fact, I was told that my car 
should have passed on the other (3) occasions but the technician who 
tested it was not getting the wheels up to the proper RPM. In 
retrospect I don't think that my Cat needed replacement. 

--- In dmcnews@xxxxxxxxxxxxxxx, "Redgee Capili" <redgee@xxxx> wrote:
> 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 
> 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 
> Reading through some of the previous threads in the list, I could 
> 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 
> 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
> [Non-text portions of this message have been removed]

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