I have heard of the concept but never have used one. I have had about ten exhaust gas analyzers (including the two I currently have) over the years. We don't use them like we used to because we do adjustments electronically. It won't be long before we will be adjusting no cars as all the electronic systems are self adjusting or are broken.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician