4l80 and Frost Harness
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There is a logical method to diagnose your problem. You look at the data and try to isolate and eliminate.
If you use a scanner and look at the commanded vs actual and also see if there are any codes (there are some tuning considerations that must be addressed when using that style harness) then you can proceed further and likely know what needs to be done to fix the problem.
Looking for a consensus on the internet isn't likely to fix the car.
Ryan did rent one of those little code readers and showed a p1810. I'm gunna look at it some more tomorrow. Might pull the pan again and see if there is anything wrong with the pressure switch and/or the plug.


