Join Date: Apr 2019
Feedback Score: 0 reviews
Temp sensor scare
'91 F250, 7.3L idi. On my way to work, idiot light "Engine" came on. I glanced at it, then saw the Engine temp gauge BURIED to the right. Truck was running normal, but I panicked, pulled over and killed the engine. Popped the hood, first think I noticed was the engine didn't seem hot. I could hold the upper hose with my hand. No steam, so-- feeling brave, I loosened the radiator cap. Slight venting- no boil over-so I removed it to inspect the fluid. Radiator fluid good, good running temp, slight radiator pressure- nothing unusual. I pulled off the connector on the single wire sensor just forward of the exhaust manifold on the driver side, gauge went to a normal reading and the idiot light went out. I plugged it back in, and gauge went full hot, but flicked back a few times (erratic) and the idiot light went off and on. This confuses me because I thought there were separate sensors for the gauge and the idiot light. I thought the gauge sensor was a two-wire sensor on the front driver side of the engine, just to the left of the AC compressor?
Obviously I do not know how these interact. I DID (on the day before) spray oven cleaner on the single wire sensor while I was attempting to clean up the area around the power steering pump (slow leak somewhere), and then sprayed the area with a water hose.
Can anyone tell me how the temperature gauge and engine idiot light work off these sensors?