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Old 10-27-2020, 12:44 AM   #61
02 LW300
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Join Date: May 2015
Location: Willamette Valley, Oregon
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2002 L-Series 2.2L Sedan
2000 L-Series 2.2L Sedan
Default Re: High engine fan speed in cold weather...a brief story...

Iac cannot control the idle speed. Can your code reader give you any readings on the iac position? If it is closing off the idle air bypass port Like it should and there are no vacuum leaks then the throttle plate is letting too much air by. I think 300,000 plus miles things might wear a little. There is a screw probably under a cap that will adjust the throttle plate. I would close the plate some but not enough to get sticky, and see if the idle control will actually work again. You might need to adjust the throttle position sensor also, but I can check. Some readjust with each key cycle.
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2002 L200/5 Loaded, over 1/4 million miles!
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