Question about 2003 GMC Envoy

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2002 gmc envoy oil pressure flux. maybe.

77,800 relatively speaking trouble free miles and the oil pressure gauge (no shudder or over heat so may be gauge/sensor only) has now started to intermittently drop dramatically to or near to zero below 1000 rpm AND less than 10 mph. this is intermittent as i said with no rhyme or reason and both factors (speed and rpm's) must be present for the anomalous behavior to occur.

it's got plenty of oil. ideas?

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  • bigeats1 Apr 14, 2009

    if i can just leave it there for an indefinite period of time and take readings, cool. trouble is, it could be days worth of normal operation before i see it again and the diagnostic fix of removing the sending unit and then installing the manual pressure gauge is temp sensitive, right? no go with any guarantee of remedy.



    good times, huh?

  • shanewilks6r May 14, 2009

    Did you ever figure out how to fix it and if so what did you do

  • Eric Heifetz
    Eric Heifetz May 11, 2010

    If you really want accuracy , remove oil pressure sending unit, install analog oil pressure gauge and take readings

  • yadayada
    yadayada May 11, 2010

    I suggest u use our premium question option on this problem.

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An oil pressure sending unit is really not an expensive item nor difficut to change . Probably the answer , sending units faulter frequently. Hope this helps

Posted on Apr 14, 2009

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