Quote:
Originally Posted by Jdmjunkie
What would happen if you grounded the ecu to the chassis?
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It might resolve some issues, but I'm going to put the ball back in KPower's court. I spent the last three hours pulling the Haltech, adapter board, engine harness and checking continuity everywhere.
Ends up that the engine harness shares ground for every thing on it from sensors to coils to ECU, rather than having a separate sensor ground.
Easiest way to check to see if your harness has this issue is to unplug the AC1 plug, unbolt the two ring connectors from the valve cover, stick an ohm meter on one, and stick an ohm meter into one of the sensor grounds like the oil pressure/temp sensor. If there is continuity then there is shared ground between sensors and everything else.
Now you can all quit listening to me talk like a crack smoker about oil temps. I'm assuming this has also been affecting crank position sensors, cam position sensors, etc since they also share the ground.