I slowed down the truck shifted down and the guage dropped rapidly It happened again about about 25 km later this time the gauge didn't drop as soon but when it did it dropped rapidly again. It didn't happen again on that trip even going up a steep hill. The next day running empty it did the same thing. It seemed to not cool as quickly as the truck didn't shift down. But seamed to be ok after it was shut down and restarted. The coolent level is good and there has been no loss during any situation. There has been no message saying the coolent was hot.
Fan clutch?
SOURCE: i have a 94 gmc sierra with 350 that has problem shifting to 2nd
Your problem likely resides with the hydraulic valve that operates the band for second gear, or lack of hydraulic pressure in the transmission. If the actuator in the transmission that operates second gear is getting sticky, then it will cause this. A filter change and flush may help, but it's likely time to start looking for someone to tear down your transmission, or replace it.
SOURCE: 2002 Chevy Tahoe LT-cranks, but shuts down quickly
check fuel pump relay, on start up, relay is bypassed, allowing a start, but dies when runs out of gas.
SOURCE: I have a dodge ram 1500, 2001, on my oil pressure
If you feel a difference in the vehicles performance it's probably not the sensor. Change the oil, and filter. Check the oil for metal flakes, shiny specs floating in the oil. Fill it back up one quart short. Add a quart of transmission fluid. Tranny fluid is a detergent, it will help clean any blockages and build up. Drive it for a week. Then change the oil again. If that doesn't fix it, you might have to drop the oil pan and clean that out. There should be a magnet in the pan. This collects metal that will harm your engine. Make you you clean it and put it back. Check the oil pickup, remove it and clean it out. Once you drop the pan, you will have access to the oil pump and it's sensor. Check them out to.
SOURCE: change oil light came on, car had oil change 1000
get oil pressure test done and check for codes in PCM
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