How do I adjust the idle on my 1994 lexus sc 300 I just replaced the idle air control valve
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1994 Lexus SC300
Question: adjust idle
Answer #1patrick mannion from Greg Solow's Engine Room, February 28, 2009, 10:08Master
The idle air control valve does electronically adjust the idle speed. They frequently get gummed up and cause the engine to stall particularly when the engine is started from cold. Was your car stalling prior to replacing the IAC valve? Is the idle speed to high or tool low now? It is not a god idea to just turn the screws at the throttle housing. You may be masking a problem probably a vacuum leak causing a rough or unstable idle.