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Could be the auto idle control valve, try cleaning before replacing (about $300). Another simpler possibility is the fuel filter,replace this first,

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16y ago

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What causes 92 Lexus 300 sc to idle high?

A high idle in a 1992 Lexus SC 300 can be caused by several factors, including a malfunctioning idle air control valve (IAC), vacuum leaks in the intake system, or issues with the throttle position sensor. Additionally, a dirty or faulty mass airflow sensor (MAF) can lead to incorrect air-fuel mixture readings, causing the engine to idle higher than normal. It's essential to conduct a thorough inspection to pinpoint the exact cause.


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