Re: Emissions Testing....Passing 2500 RPM HC, yet Fails Idle HC test. (UPDATE)

[Michael Miller <msmiller_spiritone@domain.elided>]

Thanks for all tips!

After a quick temp test of the CAT....it read 250
degrees in front of the cat, and 250 degrees on the
exhaust end.  It was dead.  So no wonder I was failing
the HC test at Idle.  Kinda surprised I even passed
the 2500 RPM test.  

I had the cat replaced in a matter of 1 hr. (Cost:
$175).  

Too bad the SMOG shop was closed.  The final-final
test will have to wait.

Thanks again,
Mike



--- Michael Miller <msmiller_spiritone@domain.elided>
wrote:
> This smog test will be the end of me.
> 
> '88 Spider Grad
> 65,000 miles
> Changed the oil yesterday. (10W40)
> Changed all the plugs.
> Idle is at 850 RPM.
> Took the car into be tested at 185 degrees. (so it
> was
> definitely hot).
> 
> The car passes the 2500 RPM HC test at 30ppm (Max
> limit is 140ppm).  Yet keeps on failing the Idle HC
> test.  I scored a 275ppm. (Max is 120 PPM).
> 
> Is my idle too low?  
> 
> Should I also replace the Rotor and the CAP?  Or
> simply pony up and buy a new CAT.  Yet if it was the
> cat...wouldn't I have failed the 2500 RPM HC test as
> well?
> 
> All help is greatly appreciated. 
> 
> Thanks
> Mike
> '88 Spider
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