on start off hear a rattle

1996 GMC SIERRA
150,000 MILES
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TOBY58
  • MEMBER
  • 1 POST
starts off sounding like a glass pack but changes to metal on metal sound. by 25 mph the sound stops. exhaust system is tight.
Oct 28, 2011 at 1:51 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Check to make sure the catalytic converter insides are not loose.
Nov 1, 2011 at 10:14 AM
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