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06 Mack Granite CV713 idle issue


rayrancho

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I have a fleet of concrete trucks. A driver complained of harsh vibrations in truck and further diagnosis showed that said truck idles at 500 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 other than slightly sluggish on take off... 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...I haven't found any information on fuel pressure specifications from fuel pump. I appreciate any help/ leads. I do not have a scan tool for this truck.

 

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47 minutes ago, rayrancho said:

I have a fleet of concrete trucks. A driver complained of harsh vibrations in truck and further diagnosis showed that said truck idles at 500 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 other than slightly sluggish on take off... 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...I haven't found any information on fuel pressure specifications from fuel pump. I appreciate any help/ leads. I do not have a scan tool for this truck.

 

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