ya know this is not only a tou
ya know this is not only a tough call but a true inigma...while the Gunson CO tester is ok for the money..$160 is downright cheap..problem is for true tuning you need to know what at least 2 things..CO..which is the amount of Fuel to Air to determine rich or lean condition (or just right) and you also need the HC readings to determine combustion condition & effieciency. An engine can be running at the perfect CO and still be missing indicated by HC. The inigma is, to my knowledge 2 gas analyzers went by the wayside many, many years ago and were replaced by 4 gas, which are now replaced by 5 gas.
In a shop of course 4 gas is neccesary because the types of tuning and potential problems are endless and all the data one can gather is neccesary..which is the reason for even more data potential with the 5 gas.
So in the absence of simple 2 gas machines I think even the DIY'er is stuck buying a 4 gas at a minimun if they want enough data to actually "tune" an engine and know it's really running correctly.
Regards, JRV
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