I am trying to set up an ECU for a 95 LT1 Caprice engine that will be used in a 58 Chevy conversion. Currently I have the body off and I am working with motor in frame and ECU is on a table next to the car. I have been able to download and flash data on the bench and in the car no problems. When I try to use the gauge function when the engine is running I am seeing all the outputs go crazy as soon as I start the car. If I use a pot on the temp guages I get stable readings with correct scaling on the bench. I am not sure if I should be looking at issues with the homeade cable, baud rate, com settings, grounding issues with cable? Does the ECU need to be grounded to the engine? Or maybe the adx file that I started with is not right. I am just looking for a direction to start with. Any help is appreciated.
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