06 Mack Granite CV713 Idle Issue

Discussion in 'Mack Forum' started by ray rancho, Jun 12, 2018.

  1. ray rancho

    ray rancho Bobtail Member

    Jun 12, 2018
    I have a fleet of concrete truck. A driver complained of harsh vibrations in truck and further diagnosis showed that said truck idles at 500 wish rpm, while the others are at 625-650 rpm smoothly. When idled up to 625-650 truck is smooth. Where to look? Driver states truck does not run poorly or have any other symptoms when driving... if low fuel pressure was the cause, wouldnt the computer pick up the issue and make necessary adjustments to put idle at desired range? idle does not fluctuate with a/c on or off
  2. Solomong1977

    Solomong1977 Bobtail Member

    Oct 31, 2019
    Did you ever resolve this issue? I have 2 CV713's doing the same thing.
  3. Brettj3876

    Brettj3876 Road Train Member

    Nov 18, 2014
    Northeast PA
    Have mack plug it in and reset the idle parameters. We did this on the 93 had same thing happen. We did it ourselves with prolink and vmac cartridge
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