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On cold start up car has very high idle and vibration please tell me why

Tiny
BRENTE228
  • MEMBER
  • 2002 KIA OPTIMA
  • 120,000 MILES
When this car is cold on start up idle is very high and has vibration after warm up its not as bad
Saturday, January 28th, 2012 AT 5:02 PM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Could be symptoms of vacuum leak. Idle is determined by how much air enters intake passage. More air higher idle. Idle is computer controlled by idle air valve. Excess air entering thru leak can raise idle/ cause rough running. Also check each cylinder for proper fuel/spark and spark plug condition and compression value.
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Saturday, January 28th, 2012 AT 5:41 PM
Tiny
BRENTE228
  • MEMBER
  • 7 POSTS
Thank you very much
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Saturday, January 28th, 2012 AT 5:45 PM

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