Engine sounds up and down

Tiny
SHADIM77
  • 2004 CHEVROLET MALIBU
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 67,000 MILES

Engine sounds up and down : when I turn it on the engine doesnt sound like one tune, the sound is up and down and even when I drive or stop at stop sign I can the sound is waxing and waning

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Tuesday, January 11th, 2011 AT 4:15 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,360 POSTS

If the idle is going up and down, check for vacuum leaks and check the idle air control valve (IAC). It is located on the throttle body and is responsible for maintaining a steady idle.

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Monday, January 17th, 2011 AT 9:19 PM

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