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Old 07-13-2023, 11:43 PM
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Join Date: May 2007
Posts: 99
1987 300E just failed California Smog Test

Hello

I just failed smog. See the results below. 4 or 6 years ago I failed and replaced the cat and have passed till today. In California we must run a emissions smog check every 2 years.



15 mph results 1772 rpm
%CO2 13.9
%O2 1.6

HC
111 failed max is 110

CO
.19 passed

NO
403 passed


25 mph results 1770 rpm
%CO2 13.8
%O2 1.5

HC
73 passed max is 77

CO
.16

NO
239


I am thinking of shorting the R16/1 reference resistor. This will retard the timing, will also plug the EZL vacuum line. Maybe also do an oil change as I know the car burns alot of oil. And then go for a retest.

Ideas or suggestions?

Thanks!
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