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thstone · 08-31-2014, 11:20 AM

I doubt that the UK allowed CO emission level for a 1999 2.5L engine is substantially (if at all) different than that allowed for a 2000+ 2.7L engine - especially in light of the fact that your car (at 1.4%) was 700% over the allowable limit (0.20%).

High CO usually means that there is incompletely burned fuel in the exhaust. I am amazed that you don't have a CEL on!

Without a CEL to point us in the right direction, you'll have to check the fuel delivery system and fuel recovery systems along with the fuel/air mix control system.

08-31-2014, 11:20 AM	#3
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	I doubt that the UK allowed CO emission level for a 1999 2.5L engine is substantially (if at all) different than that allowed for a 2000+ 2.7L engine - especially in light of the fact that your car (at 1.4%) was 700% over the allowable limit (0.20%). High CO usually means that there is incompletely burned fuel in the exhaust. I am amazed that you don't have a CEL on! Without a CEL to point us in the right direction, you'll have to check the fuel delivery system and fuel recovery systems along with the fuel/air mix control system. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor