3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

RPM fluctuates with high idle?

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Old 10-14-2007, 10:54 AM
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RPM fluctuates with high idle?

I was using high idle for the first time the other day, watching a movie on the AVIC while the old lady finished up some clothes shopping. I noticed my RPMs would spike up ~100 for about 10 seconds then drop back down to where they started. Is this normal when using high idle?
Old 10-14-2007, 12:34 PM
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was the truck cold?? maybe the grid heaters were kicking on???
Old 10-14-2007, 12:42 PM
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A/C compressor cycling?
Old 10-15-2007, 06:33 AM
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Truck was not cold, A/C was on so the compressor cycling makes sense!
Old 10-15-2007, 07:41 AM
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Mine does the same thing with the defrost or a/c on, if your gonna high idle it make sure the trans is in neutral so it circulates tranny fluid.


Tim
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