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What is the function of the Port Air bypass valve?

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Old Sep 2, 2003 | 04:22 PM
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What is the function of the Port Air bypass valve?
Would someone please describe why and when this valve operates...warm...cold....wot...idle only....???

thanks Dave
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Old Sep 3, 2003 | 10:07 AM
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under light loads, bleeds air into exh ports before O2 sensor. provides a slightly richer mix when under closed loop operation, for better response.
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Old Sep 3, 2003 | 06:17 PM
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thanks Kevin,

does it only operate in closed loop or at various rpms...I assume by closed loop...you mean it funtions at any temp
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