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Oil Pressure, unstable after A/C Compressor install.

This is a discussion on Oil Pressure, unstable after A/C Compressor install. within the General Help forums, part of the LSx Technical Help Section category; So today I reconnected my A/C Compressor and recharged my A/C system. However while driving it I noticed the oil ...

  1. #1
    Junior Member FiretoFlames's Avatar
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    Oil Pressure, unstable after A/C Compressor install.

    So today I reconnected my A/C Compressor and recharged my A/C system. However while driving it I noticed the oil pressure has dropped a bit and move up and down a little at idle. I'm not sure if the getting the A/C compressor reconnected caused this if it it's something else. My car is a 1999 Z28 with a T56 and 202k miles. Any help would be appreciated.

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    Spaz is My Mentor SMWS6TA's Avatar
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    more importantly is what are the oil pressure numbers reading at?

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    Junior Member FiretoFlames's Avatar
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    It's in between a quarter and half at idle.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    20 -40 psi?

    Should be around 30-40 psi at idle for stock car. (depending on oil weight and engine wear condition)

    200k miles on making that milestone. I killed mine around 165k.


    A little bit of drag on the motor might increase/decrease the oil pressure because it's attached via belt to the crank but shouldn't be enough to really notice.

    Keep an eye on the OP gauge.

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    Junior Member FiretoFlames's Avatar
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    Well I'd say it's about it moves around from 25 to 35. Never goes to 20. Before it would idle at 35psi but it just seems like it's moving a bit too much. It doesn't do it all the time but it just kind of keeps me on edge when I'm at a stop light and I'm watching it move back and forth and back forth. I'm no expert but I don't think it should move around so much at idle but then again this is the first time I've ever had the A/C compressor, it was never connected when I purchased the car.

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    If your AC compressor is engaging and disengaging at idle that can affect the engines rpm. In turn, this could conceivably result in what you are seeing as the compressor cycles on and off. Shut the AC off and see what it does.

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