Thread: Won't idle
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Old 12-04-2021, 01:47 PM   #6
bobxyz
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Join Date: Aug 2014
Location: Boulder CO
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Here's how the 2-wire LH2.4 IAC valve behaves over ~10 minutes of my drive to work. The IAC pwm duty cycle is the white line on the bottom graph (click pic for bigger)



The IAC valve runs at 97.7Hz (10.24ms) with pwm duty cycle varying between ~75% briefly at startup to ~38% lowest idle flow. In addition to idle speed, LH2.4 seems to adjust the idle air based on RPM too. The corner box in MLV shows ~20 seconds of idling at a stop light, with IAC varying around 41.5% at ~750rpm.

Full logs are here: https://www.dropbox.com/sh/bjr74pnng...L6mkEgPma?dl=0
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