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What could be the problem when my Chevy 4x4 1500 oil pressure gauge starts at ok pressure then drops to 0 but truck runs good what could cause this?
Wiki User
∙ 12y ago
well a few things to try.First check the sending unit it could be bad,you can do this with a mechanical gage.Some gm's need to show pressure from oil sender to activate the fuel pump.so if that's the case you would have to put in a tee.next would be changing the oil"try a little thicker oil" although this is just a cover up for lose clerances but i have had good luck with chevys and doing this.Unlike Ford's Chevy's don't need much pressure they say 10psi for every 1000rpm's that's a good rule of thumb!I have a 93 z-28 with a LT-1 350 hot idle it holds maybe 12-13 psi and at 5,600 rpms it has maybe 38-40 psi i drive this car 470 miles one way to visit family "hey car gets 26-27 mpg with a 3:23 rear end my 08 impala with the 3.5 v-6 don't get that .I drive that car HARD!!!it's a Chevy n-e way last thing to check is the thermostat it could be stuck causing the oil to "thin"out you didnt say anything about it running hot just a idea. if the truck reads the same on the mech. gage as on the dash don't drive it.Cause something is wrong cam bearings seem to cause low oil press. on chevys but if the 2 gages are different and you have at least 35psi @4500-5000 drive it
Wiki User
∙ 12y ago
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