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2000 GMC Sonoma high oil pressure

Tiny
GMMAN00
  • MEMBER
  • 2000 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 138,000 MILES
I bought a sonoma a few months ago and in the mornings when I start the truck the oil pressure stays around 75-80 and slowly drops to 40 as the truck warms up. If I rev it up or drive the oil pressure goes back up to 60-65 and when im driving on the highway it rises up to 65-70. I use pennzoil synthetic oil and it runs fine other then the oil pressure being really high. It doesnt leak oil and hasnt blown any seals could the gauge just not be working right?
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Monday, November 8th, 2010 AT 9:28 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the oil pressure with a mechanical gauge, if normal replace the oil pressure switch. If abnormal could mean oil pump and/or engine bearing.
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Monday, November 8th, 2010 AT 9:39 PM
Tiny
GMMAN00
  • MEMBER
  • 8 POSTS
Ok can I get a mechanical gauge at any auto parts store and also where is the oil pressure switch located at
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Monday, November 8th, 2010 AT 9:43 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine Oil Pressure Gauge Sensor (2.2L VIN 4) On right side of engine
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Tuesday, November 9th, 2010 AT 2:03 AM

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