RicDon Posted November 7 Share Posted November 7 I have a 2014 Mack Pinnacle CHU613 with Mdrive transmission , when the truck warms up it starts loosing throttle while driving coming to a complete stop at times. Also when making turns it’ll start bucking. It doesn’t throw any codes in the process. Had it to our local Mack shop several times and they can’t figure anything out. We’ve replaced the accelerator pedal 3 times, the gear selector, wire harness for trans, speed sensor, pressure test on fuel system and they said it was fine. Has anyone experienced this? Or know what’s going on with this truck? Quote Link to comment https://www.bigmacktrucks.com/topic/74724-pinnacle-chu613/ Share on other sites More sharing options...
fjh Posted November 8 Share Posted November 8 19 hours ago, RicDon said: I have a 2014 Mack Pinnacle CHU613 with Mdrive transmission , when the truck warms up it starts loosing throttle while driving coming to a complete stop at times. Also when making turns it’ll start bucking. It doesn’t throw any codes in the process. Had it to our local Mack shop several times and they can’t figure anything out. We’ve replaced the accelerator pedal 3 times, the gear selector, wire harness for trans, speed sensor, pressure test on fuel system and they said it was fine. Has anyone experienced this? Or know what’s going on with this truck? Did they check for combustion in the fuel? Did they check the tank vents? Did they check for something floating in the tanks? also is your truck equiped with roll over protection the yaw sensors could be causing this! all possibility's! Quote Link to comment https://www.bigmacktrucks.com/topic/74724-pinnacle-chu613/#findComment-561583 Share on other sites More sharing options...
The Heinz Posted November 10 Share Posted November 10 Not 100%, but the brake demand sensors near the brake pedal are usual suspects for issues like this. I've seen them cause loss of power complaints lately, so I would look into that/have a SMART shop look into it. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74724-pinnacle-chu613/#findComment-561638 Share on other sites More sharing options...
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