1991 gmc Sierra 5.7

Asked by Apr 07, 2014 at 01:53 PM about the 1989 GMC Sierra

Question type: Maintenance & Repair

Since my last oil change my oil
pressure isn't building, it used to sit
on 30psi now it barely reads on the
dial, any advice on the problem?

2 Answers

10,695

Well I wouldn't run it until you find the problem. You can try replacing the sending unit. How is the oil level on the dipstick. Did you change it or a shop.

1 of 1 people found this helpful.
10,695

Personally I would check the pump first but I have tools and equipment to do that. To test the oil pressure sending unit I use compressed air and a regulator. Pull the unit out attach the air and plug it back into the truck. Pressure up to a known pressure on a gauge and confirm the reading on the dash. If your sending unit is fine it is either the pump/pressure regulator or engine damage causing the low pressure. Start with the sending unit and we'll go from there.

Your Answer

GMC Sierra Experts

  • #1
    Js08016
    Reputation
    110
  • #1
    dandyoun
    Reputation
    110
  • #3
    John Saffrahn
    Reputation
    80
View All

Related Models For Sale

Used GMC Sierra 1500
871 Great Deals out of 65,537 listings starting at $1,500
Used Ford F-150
2,246 Great Deals out of 179,996 listings starting at $1,300
Used GMC Sierra 2500
140 listings starting at $3,495
Used Chevrolet Camaro
384 Great Deals out of 30,498 listings starting at $3,500

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.