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  1. #1

    Default oil pressure switch 97 K1500

    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

    Default

    You're describing a classic oil pressure sender problem. The sender is at the rear of the engine, actually under the distributor. You can probably get at it without removing the distributor as long as you have the correct socket for it. Just to be safe, I'd attach a manual gage when the sender's out, and check the actual pressure, just to be sure.
    Good Luck and God Bless

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