Re: BAD CAT? READ THIS

[Alan Lambert <lechefgerard@domain.elided>]

--- christian147@domain.elided wrote:
> Very good reason It doesn't get done, it won't tell you if the cat is
> good or bad , just if it is working.  Overly lean or rich mixtures
> will
> prevent light off.  Also won't tell you about catalyst efficiency. 
> If
> say only the lower portion of the catalyst bed were functional you
> could
> see a temp rise but still have a cat that won't get you past
> emissions. 
> Only good way I know test is with  pre and post catalyst narrow band
> O2
> sensors and a duel trace graphing volt meter.

Does this mean "oscilloscope"?



  The lean-rich toggling
> should be visible in the pre trace and should be at least 3Hz, post
> should be mostly flat never dropping below the tops of the pre wave
> form.
> 
> Chris Hall
> 
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=====
Best Regards,

Alan Lambert
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