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1994 Chevy Silverado hissing noise from throttle body

Tiny
941500K
  • MEMBER
  • 1994 CHEVROLET SILVERADO
Engine Mechanical problem
1994 Chevy Silverado V8 Four Wheel Drive Automatic 195k miles

I changed intake gaskets an now am getting hissing noise from throttle body, will not idle, backfires, and lopes like I put cam in it
Saturday, January 31st, 2009 AT 4:15 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
If you hear a hissing sound, there is a vacuum leak. Make sure all vacuum lines are attached and not damaged. Make sure the throttle body is tight and nothing got pinched under it.

Let me know what you find.

Joe
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Monday, February 2nd, 2009 AT 12:48 PM
Tiny
941500K
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I have tried those things with no luck, thanks for the help though
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Monday, February 2nd, 2009 AT 5:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Have you tried using starting fluid to see of the RPM's change when you spray it near the sound? I normally don't like to recommend this because of the fire hazard it creates.
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Monday, February 2nd, 2009 AT 5:42 PM

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