Wondering what the sound is when I start my 99 GMC Suburban up...

1999 GMC SUBURBAN
145,000 MILES
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DCPLACE2007
  • MEMBER
  • 28 POSTS
My vehicle's engine makes a honking, vibrating sound when it is started. Almost sound like someone is blowing through a kazoo..This usually only happens when the vehicle is started from a cold start. After it has warmed up, it does not make the sound when I start it. The sound lasts for about a second. Any help is much appreciated...Thanks...
Nov 21, 2011 at 12:06 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Check for vacuum leaks. As the engine gets hot, steel expands. Perhaps that is why it doesn't do it hot.
Nov 21, 2011 at 12:17 PM
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