Originally Posted by wingnutks
I was having the same problem... oil pick up was clogged with sludge. When you romp on it the pump will out flow the pick up and oil pressure drops. Drop the pan and check it out asap.
I don't think it is a real oil pressure problem--hard acceleration doesn't cause any problems... Only starting, you start, then key off, restart and then the gauge reads. It does have oil pressure--engine makes no abnormal noises for example when the gauge reads zero. I'm going with a new sensor (kinda want to get the right one the first time...) since that is cheap and appears easy to do. Another reason why I don't think this is impeded oil flow is that the truck has done this since new... It is just that when new it happened once every few months (so that the dealer could/would do nothing since they could not reproduce it...) Then it was fine for about three years, and in the last year it has gotten much worse. Truck has 70K miles on it, a lot of local driving and a few trips, and oil changes every 6K miles. (I own a nice (personal, not commercial) shop so working on these is not hard...) +++ Update +++ Picked up the sender, and tossed it in. All considered not too bad, wish I had the correct wrench/socket but a 27 MM open end worked almost as well. And now, when I start up I have oil pressure! No more double starts for me.