3dimesdown Posted March 11, 2023 Share Posted March 11, 2023 Hey guys new to this Mack page, I have a 2002 RB tandem dump truck. Lately it has been auto idling up for no reason even when it’s warm? Also I feel like the accelerator feels delayed at times? Just looking for some input !! Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted March 11, 2023 Share Posted March 11, 2023 do you have a 5-1 or 5-2 code? How high does it go up, and does it stop? Has any work been done latley.. Is there dirt jammed into the wheel under the pedal? That is the throttle position sensor. jojo Quote Link to comment Share on other sites More sharing options...
3dimesdown Posted March 11, 2023 Author Share Posted March 11, 2023 No work done on it lately, wheel Is nice and clean and well oiled. It goes up to probably 1000. Then if you tap the throttle it’s like there’s nothing there. You pretty much have to go right to the floor it drops the throttle down and back to normal Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted March 11, 2023 Share Posted March 11, 2023 I have to think on this one.. Do you have access to P.T.T.? if so, I recommend a throttle re-calibration. any chance you have another truck like it, so you can swap the throttle pedal to see if it changes? There should be a few others coming along to help you with this one.. Lots of smart guys here. jojo Quote Link to comment Share on other sites More sharing options...
3dimesdown Posted March 13, 2023 Author Share Posted March 13, 2023 Just checked and I have a 5-1 code ? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted March 13, 2023 Share Posted March 13, 2023 Throttle position sensor... Do you have a test pedal to try before spending the $400 ish dollars? 1 Quote Link to comment Share on other sites More sharing options...
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