Hello,
Long time lurker, second time poster.
I recently installed a refreshed engine and am having a strange issue. The engine temperature gauge maxes out at 250 consistently. Even on cold starts or even just key in/acc on, the gauge goes all the way up and the radiator fans kick on full blast. AP reads 250 coolant temp. During engine harness removal (several months ago) the coolant sensor plug crumbled in my hands. So I assumed that was the issue. I replaced the plug- same issue. I replaced the sensor- same issue. I also confirmed I did not get the wires backwards.
I did all of that assuming the coolant temp sensor is what feeds the ECU and in turn what operates the gauge. Maybe the sensor is fine and there is another sensor i missed. Can anyone confirm what actually feeds the engine temp gauge?
Now I'm thinking its a wiring gremlin in the engine harness. Probed the plug and im getting 12v on the red wire and .4V on the yellow wire. I tested the sensors and they appear to be working.
From what I can find on the innerwebs, 12V is not correct(again I could be wrong). Im working on finding an engine harness diagram to aid my search.
Also, worth noting. My MAF sensor appears to have died also(I have a replacement on the way). Car will not start with MAF plugged in. Getting engine codes confirming its not seeing the MAF/ intake air temp. The car will start with the MAF unplugged. If I plug the MAF back in while its running, it stumbles for a moment but then continues to idle normally.
Im hoping a bright mind can be of some help here. I appreciate any info that can be provided.