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Idle up and down

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Old 10-21-2011, 10:26 PM
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Idle up and down

I have a 99 F-150 4x4 with the 5.4... While idling it will stay around the 800 rpm range for awhile then what sounds like a switch clicks and it goes up to 1100 rpm then repeats thee cycle... It does this cycle constantly, hot or cold, and I'm just curious as to what makes it do this?

Thanks,
Willie
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Old 10-21-2011, 11:17 PM
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Do you hear this click with the ac on? if so its the ac clutch engaging and disengaging the pcm will increase rpm to handle load, if it is cycling too much 6-8 times a minute indicates low refrigerant pressure levels, get charged or low pressure switch malfunctioning IMO
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Old 10-22-2011, 09:08 AM
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That's exactly what it sounds like, but the ac is off...
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Old 10-22-2011, 10:35 AM
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Ac cycling switch? its on top of the dryer, passenger firewall behind engine harness connector brackets
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Old 10-24-2011, 12:19 AM
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Would that be the AC clutch switch? More Information for MOTORCRAFT YH1462 I haven't had a chance to look for the one you described I'll try and get to that tomorrow... Thanks again!
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Old 10-24-2011, 08:29 PM
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And also, if I disconnect the switch will I see a difference in the idle at all?
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Old 10-24-2011, 09:49 PM
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IF you disconnect the connector at the pump or the dryer it shouldnt engage, no a/c, i would think, i never tried
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