Question about Chevrolet Silverado 1500
My oil pressure reading is very erratic until the vehicle is at operating temperature. The pressure reading will fluctuate all the way from 0, with the alarm going off, to 20. Normal range for this truck has been between 20 and 40 pounds, and it stays in this range once the vehicle is at operating temperature. I had a mechanic check it...he said the pump is fine and had no idea why the gauge was erratic.
More then likely the sending unit is faulty, but to be safe hook up a mechanical test gage at the oil pressure sender port and check oil pressure hot engine, if it is steady then replace the sending unit.
Posted on Jul 28, 2017
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Posted on Jan 02, 2017
It's probably the oil pressure switch. I have to replace min every 5 years or so because it does the same thing. Mine is mounted next to the filter on my '93. It's a little black thing with a plug in the end. You can get one at autozone for about $40.
Posted on Oct 24, 2008
The only spec that Jeep gives for the oil pressure is 37lbs @ 1600 rpm. Since you are within specs I would not concern myself with it. Though with a new oil change you will probably notice a slight increase.
Also beware that the 4.0 is known for bad oil pressure switches.
Tell your son to have a safe trip and don't worry.
Posted on Nov 24, 2008
The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
Posted on Mar 30, 2009
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