Feb 272010
 

my 92 s-10 blazer 4.3l throttle body has the check engine light on and the oil pressure guage is reading low (at the lowest point on the guage). the oil level is at the full mark on the dipstick. as i am driving and accelerating the pressure rises slightly and the light flickers on and off.(check engine light) there is no difference in the performance of the motor and the gas mileage seems to be the same. could this reading on the guage be a problem with the pump, oil sending unit, oil pressure switch and how can I properly diagnose the problem myself? and should the vehicle still be driven before diagnosis? thank you in advance for your response.

  One Response to “1992 chevy blazer oil pressure guage”

  1. Check Engine Light codes and how to extract the codes yourself: http://www.freeautomechanic.com/diagnostictroblecodes5.html

    As for the low oil pressure, most likely the oil pressure sending unit needs to be replaced as it is a common failure part.

    An Engine Requires 10 psi of oil pressure for every 1,000 rpm. so at idle, it does not require much,,, at 3,000 rpm, the engine requires 30 psi. You can install an actual pressure tester at the sending unit port if you would like to see actual numbers for diagnosing.

    Replacing the sending unit will most likely take care of the oil pressure issue.

    I some cases the check engine light can be set with a “check Gauges”. But it is a good idea to check the codes and proceed once you have the actual codes.

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