5.7 wants to stall when stoped when HVAC is on

Discussion in '96+ Vortec Performance + Computer Swaps' started by SuperTramp, Aug 31, 2020.

  1. SUBURBAN5

    SUBURBAN5 I'm Awesome

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    Man I have this problem ever since I got the rebuilt motor. Dummy mechanic blamed the guage. I swapped 2 sending units and new after market guage. All the same readings. Morning and first start, Had good pressure. Running a while, it would drop to low pressure. Finally just unplugged the guage and driven it sense. My guess is the pump or bearings . But gonna waiting til it gets worse. Before I deal with it. Really want a 383stroker lol
     
  2. stutaeng

    stutaeng I'm Awesome

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    Most likely bearings. But this started after a rebuild? Maybe clearance was too loose on the rebuild? Maybe they didn't check them?

    You can try switching to heavier oil to gain a bit of pressure. I think I switched to like 20W-50 on my 4.3 and got me from like 5 psi to 8 psi. Checked with a mechanical guage.
    It's
    still running like that after 12 months. Getting finally ready to swap the engine.
     
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  3. SUBURBAN5

    SUBURBAN5 I'm Awesome

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    That's what I figured. I've been putting 10w40
    Scared to put thicker lol. But I agree. I need a mechanical guage for the real readings lol. Motor about 2 or 3 yrs old. Been running it like this for quit some time. Thanks for the suggestions
     
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