Quote:
Originally Posted by zooklm
As I recall, O2 sensors were not part of the mechanical injection system that these cars used. The system relys upon fuel pressure and pump volume to assure proper fuel supply. As the air flow sensor opens, the amount of fuel flow to the injectors is increased.
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The last of the CIS cars did have a O2 sensor. It drives the frequency valve which modifies control pressure in an attempt to close the loop on the fuel injection.
I don't know if it was late '78 or '79 that it was added.
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120
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