I had a similar experience with my 94 K1500. It ended up being low on oil. The fluxuations could be the oil sloshing in the pan and the pickup tube intermitently being in/out of the oil. Your post didn't mention if you checked the oil or not. Let us know if it is low. Also, I had a major leak in my oil filter housing that sends the oil up front to the oil cooler. I took that apart and replace the seals/gaskets with a kit. No more leak and my presure stays pretty steady. At idle, it goes about 20PSI and at highway speeds about 40PSI. Not sure if this is the norm, but I have no problems with overheating. Hope this helps. Andy
OK here we go. i'm driving to town today and i look down and the oil
> pressure gauge is way up over 40 KPi. i drive a little farther and it
> drops to 20 then jumps back up to 40 then returns to a normal (for the
> truck) 30. I make it to town down shift to D from o/d and it jumps
> back to 40. it seams to stay at 40 ( the max on the guage) when the
> rpm are a high or about the shift point. on the highway in o/d it
> moves from 20-40 and does a lot of jittering in between.sometimes it
> just stays on high. Sitting at idle it usually returnes to a normal > 20KPI
>
> we have had a lot of snow and there may have been some in the engine
> compartment when i started it up. restarted it a couple times with no > change.
>
> truck is 1989 1500 silverado 305 auto tranny
> so my questions are:
> Whats wrong with my oil pressure
> could it be a faulty sensor
> where is the sensor
> how much oil pressure is too much.
> is it still ok to drive with the pressure guage jumping like that?