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Idle fails to return to low idle
Posted to HD/Fleet Forum on 4/17/2016 1 Reply

2009 T800 ISX550 Cummins w/Century 9055.

Idle set point is 650RPM but 3 days ago idle reset itself to +/-800RPM. This idle is a bit fast in tight spot maneuvering and sometimes low speed shifting. ECM has a max fast idle set of 1300rpm and an 800 set to 1100 ... Login to read more.

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