Idle Problem When Fan Comes On

[Parking17]

Hello,

Have a 2004 IS with 80k on it. Runs great. Problem is when I sit in traffic or a drive thru, engine almost dies when the cooling fan comes on. When the fan kicks off, idles normal and smooth. No lights on in the dash. Is there a relay or switch that should be advancing the idle when the fan comes on?

[IanH]

Hello,

Have a 2004 IS with 80k on it. Runs great. Problem is when I sit in traffic or a drive thru, engine almost dies when the cooling fan comes on. When the fan kicks off, idles normal and smooth. No lights on in the dash. Is there a relay or switch that should be advancing the idle when the fan comes on?

Check your idle control valve, maybe needs cleaning, called IACV on most cars. Not sure what its called on IS300.

[Parking17]

Engine has now stalled twice. No Check engine light or code. Starts right back up.