Question about 1994 Chevrolet S-10 Blazer

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Oil pressure goes down to zero chevrolet s10 /gmc sonoma 1994

I have a gmc sonoma truck 1994 4.3 liter vortec when i drive in freeways pressure is good over 45 its just when i make a stop and push the brakes when pressure goes to orange zone and lightgoes on check your gauges !!! and start to shake then i accelerate and pressure goes up again !!! i beleve may be oil pressure switch but i dont know where it goes !!

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This link should help..

http://www.lube-tips.com/challenge/2003-02-05.asp


let me know
Thanks\Smith

Posted on Sep 06, 2009

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Where is my 02 sensor on my sonoma? its a 94 with the 4.3 liter vortec motor.


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I am having a problem after warm up and at idle speed the oil pressure drop low enought to trigger the check gauges light. I have been trying to trouble shoot the problem with oil changes etc. but it is...


4.3L Engine To Remove:
  1. Remove or disconnect the following:
    • Engine oil pan
    • The oil pump bolt gm_truck_43_ol-pmp_blt.gif

    • The oil pump
    • Inspect the pins (oil pump locator) for damage gm_truck_43_ol-pmp_loctr-pns.gif

      1. Replace the pins if required
  2. Clean and inspect all parts.
To Install:
  1. Inspect for properly installed pins (oil pump locator). Note: Do not reuse the oil pump driveshaft retainer. During assembly, install a new oil pump driveshaft retainer.
  2. Install or connect the following:
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      1. Position the oil pump onto the pins
    • The oil pump bolt attaching the oil pump to the rear crankshaft bearing cap
      1. Tighten the oil pump bolt, Torque to: 66 lb ft (90 Nm)
    • The oil pan

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hook up a mechanical gauge and verify the pressure at idle is correct, I suspect the sending unit is defective

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