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

I notice that the RPM is actually lower at 25mph which leads me to 
believe you have an automatic?

Given the RPM I am suspect of the adjustment of the micro switch. If 
it is activated to the idle position the vacuum advance shuts down 
and the idle speed motor comes on. With a slight throttle open 
position to attain speed this would cause an imbalance in the air 
fuel ratio for that throttle position. It would seem that something 
like this is occuring since at 1916 rpm the engine was clean but at 
1903 it wasn't. Even considering load at the same RPM I doubt if it 
is parts or fuel age/octane related. Could be a vacuum leak I would 
check the vacuum lines - ALL of them, especially at the fuel 

Harold McElraft - 3354

--- 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

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