Hellmark -
Welcome to EM! I don't have an OBDI car so I haven't done anything with that.
If you're a maker then you sound like a candidate for the MPGuino :
OpenGauge / MPGuino FE computer - Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com
I Googled "OBDI protocol" and found this :
The History of Onboard Diagnostics OBD1, OBD 1.5 & OBD11-Virtual Mechanix
Quote:
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In 1985 OBD-1 was introduced to standardise the way in which vehicle systems could be monitored. The list of functions OBD1 would have to achieve grew with the need for real time misfire detection, Lambda sensors, the catalytic converter and fault code capability.
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CarloSW2