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Originally Posted by pmizell
This is on the C280. The car was recently purchased so I don't know how old the 02 sensor is.
I'm going to run some tests (pull codes, etc.), change plugs and oil and see what I can turn up.
I don't understand though why HC's would jump so high when reducing NOx.
Thanks for the replies.  |
Typicly what causes high NOx readings...which on a Gas engine is a lean misture indication. and therefor high combustion temps.....fattening up the mixture to reduce that will rais the HC's .......also a bad cat will give horrible HC's.
How many miles are on the engine? I would run a can of BG products BG44K......thats the best injector and combustion chamber cleaner I have personally used.
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1971 280SE W108
1979 300SD W116
1983 300D W123
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