1987 GMC Safari engine knocking

1987 GMC SAFARI
140,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JFS065
  • MEMBER
  • 2 POSTS
My van makes a loud knock from the drivers side when first started .After driving for 10miles it quieten down to a very light tap otherwise it runs fine.can you help I ask this once before
Feb 25, 2008 at 5:20 AM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
It could be either a bad wrist pin or connecting rod bearing, drive till it dies...Requires a rebuild anyway.
Keep in mind this is a diagnosis made with your description, any mechanic can tell you what it is, if this is the right diagnosis..
Feb 25, 2008 at 6:20 AM
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