1997 GMC JIMMY OIL PRESSURE PROBLEMS

  • Tiny
  • gmman00
  • 1997 GMC Jimmy

1997 GMC Jimmy 6 cyl Four Wheel Drive Automatic 185000 miles

i have a 1997 jimmy when I start it the oil pressure is around 40-45 and drops to 30 or 35 when is warm, and goes back to 40 or just above when I am driving. After driving for a long time or after driving on the highway and stopping the oil pressure drops to around 20 at idle and I can feel a slight vibration. When I bought it a few years ago the oil pressure was always at 40 it has been doing this for a year or more now since I let it get low on oil 1 time last year. Is the oil pump going out or is this something I dont need to worry about.

Monday, November 8th, 2010 AT 7:28 PM

6 Answers

  • Tiny
  • Wrenchtech
  • Expert
  • 19,541 posts

A few different things could be happening. It could be the brand of oil that your using. It could be a bad oil pressure sender or it could actually be getting lower pressure due to engine or oil pump wear. It's going to take some experimenting to determine which.

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Monday, November 8th, 2010 AT 7:40 PM
  • Tiny
  • gmman00
  • Member

I used to not really pay attention to what oil I used. Now the last sevral oil changes I have used pennzoil platinum with fram extra guard filter the better oil seems to help but not much. Is this something that will cause further harm if I keep driving it like this?

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Monday, November 8th, 2010 AT 9:05 PM
  • Tiny
  • Wrenchtech
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  • 19,541 posts

You'd have to find out what the actual problem is before anybody can answer that. Right now you don't even know if the reading is accurate or not.

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Monday, November 8th, 2010 AT 9:07 PM
  • Tiny
  • gmman00
  • Member

Ok thanks for the help

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Monday, November 8th, 2010 AT 9:13 PM
  • Tiny
  • gmman00
  • Member

After I check with a mechanical gauge if the pressure reading is accurate where is the oil pressure sender located at?

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Monday, November 8th, 2010 AT 9:46 PM
  • Tiny
  • Wrenchtech
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  • 19,541 posts

Rear of engine near distributor

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Tuesday, November 9th, 2010 AT 4:20 AM

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