Why does my gauge go down to 0psi then boost up to 70/80psi so rapidly?

Asked by Dillon Feb 17, 2020 at 10:52 PM about the 2004 Chevrolet Silverado 1500 Extended Cab RWD

Question type: Maintenance & Repair

I have a 2004 Silverado 1500 with a 4.3L v6 engine
that has 139k miles. Just this morning while driving
to school, I came to a stop at an intersection and
the truck indicated on the dash low oil pressure.
The gauge read close to 0psi at a stop, and when I
accelerated to pull off to get to a shoulder than, the
psi went up to the 70-80psi range accelerating. I
shut the truck off and checked the oil and the level
was normal. I then restarted the truck and heard no
abnormal noises. I continued to drive for the next 3
mins with the problem happening, then the gauge
went back to reading normal oil psi. My normal
seems to be idle at 20-25psi and driving with 1200-
2000rpms about 35-45psi. This problem with low oil
indication and rapid increase of pressure from
accelerating, reoccurs after my truck sits for
3+hours. I live in Wisconsin so the winter weather
affects certain things. Anyway, would this issue that
only happens before the truck reaches its normal
engine temp, be a bad oil sensor switch, filter, or an
oil pump?

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