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Cold Start Idle Speed

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Old 03-04-20, 09:27 PM
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Lexmart
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Default Cold Start Idle Speed
My 2013 ES350 idles at about 1300 rpm when I first start it cold in the morning. When warmed up, it drops to about 610 RPM. Is that normal to idle that high at a cold start?
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Old 03-04-20, 10:01 PM
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st1800
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Yes, that’s normal.
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Old 03-05-20, 05:44 AM
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bc6152
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A cold engine must run rich i.e. more fuel vs. air until it reaches a set temp. This causes the higher RPM's... As st1800 states it is perfectly normal...
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Old 03-05-20, 09:14 AM
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Nelexus88
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Another reason the ECM runs the cold idle higher is to warm up the catalytic converters faster to meet emission standards
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Old 03-06-20, 08:38 AM
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Thank you all for the replies. One less thing to worry about.
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