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1988 GMC Sierra making a knocking sound as i drive up hill

1988 GMC SIERRA
102,000 MILES • V8 • 4WD • AUTOMATIC
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CERNUNNOS
  • MEMBER
  • 1 POST
my truck a gmc sierra 1500 makes a knocking sound as i start to pull a hill an if i give some gas it will get loud. if im on a flat its ok. there is no power loss but it does the knocking.
Aug 29, 2009 at 11:49 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Sounds like its pinging could be due to an EGR valve. and Knock sensor
Aug 29, 2009 at 12:05 PM
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