When I went to start the truck at lunch time there was a really high pitched squeal for about 5 seconds. It reminds me of those ricers you see going down the street with squealing cams (I think they are cams). Anyways, it went away in 5 seconds. I got out of the truck and checked around, couldn't hear anything.
I have a 5 speed manual & I started the truck on a hill with the parking brake on & the shifter in H2 & Reverse (clutch in). The noise seemed to go away at the same time I moved the shifter from reverse to neutral. It did not come back when I put it back in reverse or first or let out the clutch 1/2 way for a split second with the brakes still engaged.
Has this happened to anyone? First time I've heard it. Recommendations? Should I start leaving my truck out of gear in the winter? (i know the manual says not to use the parking brake below 32F, but I do anyway).
my guess is something to do with oil pressure. Could the angle of the hill (nose down) have limited the oil going to the oil pump on start? Should a pump primer be installed? or an oilpan heater, or should I turn the ignition on and wait 10 seconds to twist to start?