Erratic idling when engine at normal temperature

EMCKENZIE

MEMBER
2009 SUZUKI VITARA
2.0L
4 CYL
2WD
AUTOMATIC
53,000 MILES

Hi,

My Vitara is fine when I start it up and drive for 15minutes, but when the engine gets to normal temperature the idling at the stop light slowly drops to 500rpms then goes back up to seven hundred. With the a/c on it idles up to 800rpms but drops to 700 and back up to 800.

Do you know what can be the problem?

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

Most times, a fluctuation in idle speed is caused by the idle air control valve (IAC). The IAC is responsible for maintaining a smooth idle. It could also be the result of an engine vacuum leak.

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Wednesday, September 2nd, 2015 AT 7:37 PM