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

06,5.9.low idle

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Old 06-07-2010, 05:50 PM
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06,5.9.low idle

My 06,5.9 cummins is idling at 300 rpm,the tach appears to be accurate at 60mph,based on Rpm and 3.73 gear,checked with gps. Any ideas?
Old 06-07-2010, 06:14 PM
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It's your tach. Mine does it too. Most of the time anyway. Expensive to fix, so I live with it.
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