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1989 Chevrolet Silverado TBI

Tiny
66MALIBUJOE
  • MEMBER
  • 1989 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Rebuilt Throttle body now has fast idle 2500-3000 rpm replaced Idle Air Control Valve
still fast idle HELP
Tuesday, March 17th, 2015 AT 9:33 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked for vacuum leaks? Have you checked for trouble codes? Have you checked fuel pump pressure?
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Tuesday, March 17th, 2015 AT 6:27 PM
Tiny
66MALIBUJOE
  • MEMBER
  • 2 POSTS
No vacuum leaks. Fuel Pressure at 11 psi. No codes since rebuild of throttle body
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Thursday, March 26th, 2015 AT 11:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
What codes were there prior to the repair? Also, these engines are know for intake leaks. Are you certain there is no problem there? Also, have you checked the EGR operation?
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Thursday, March 26th, 2015 AT 6:54 PM

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