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  1. #1

    Default oil pressure switch 97' K1500 5.7L

    I have a 97 K1500 w/5.7L and 251K miles. Just noticed the other day that the oil pressure was unusally low. It usually runs about 45-50 psi (per gage on dash) at highway cruising speeds, however it now stays around the 30 psi range. I would think that if the oil pump was getting weak it would be more gradual. Just changed the oil and the presure hasn't improved (10W30). The pressure also fluctuates quickly sometimes at constant rpm. Are the oil pressure switches prone to aging reporting lower pressure than normal ? Where is the switch located?

  2. #2
    Sr. Mechanic Ethan's Avatar
    Join Date
    Sep 2009
    Cedar Park, TX


    Yeah, they are usually not very accurate to begin with, mine does the same thing, but I know my oil pump works just fine. They are a long black tube, with a 3 wire connector coming out of it on the back of the block behind the distributor, it's got a 90 degree angle coming out of the block going to the sensor.
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

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