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06-06-2005, 09:38 PM
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1984 280SL Smog Test Results
Today I took my newest problem child in for its smog restest. Car has 160K on it and smoked profusely. Following a head rebuild, I had it tested for emssions and it failed miserably.
So, did the following: - Installed an 87 degree thermostat - Installed a Timevalve cat and header pipes with a fitting for an O2 sensor - Cleaned injectors - Installed a Bosch single wire O2 sensor ($16.95) pre-cat. Ajdusted mixture to get close to the reference voltage of .45v, which according to the is the ideal 14.7 air/fuel ratio. Car runs very well. The results of the test surprised me. Idle and 2500 RPM were very similar: HC ppm: 26 Limit: 220 CO%: 0.00 Limit 1.20% Basically near new car standards. Who says these old hooters are polluters?
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe 
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