joey Posted August 25, 2016 Share Posted August 25, 2016 2000 rd 688s having accelerating in high gears. i am experiencing loss in power and hesitation. changed fuel pump and no change. lightning bolt only comes on while driving so when hooked to scanner shows no code Quote Link to comment https://www.bigmacktrucks.com/topic/46578-2000-mack-rd688s-lighting-bolt-only-comes-on-while-driving/ Share on other sites More sharing options...
hatcity Posted August 25, 2016 Share Posted August 25, 2016 Have you tried to get a blink code when it happens? possible that one EUP is having a malfunction Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/46578-2000-mack-rd688s-lighting-bolt-only-comes-on-while-driving/#findComment-343591 Share on other sites More sharing options...
fjh Posted August 26, 2016 Share Posted August 26, 2016 Road speed sensor? Quote Link to comment https://www.bigmacktrucks.com/topic/46578-2000-mack-rd688s-lighting-bolt-only-comes-on-while-driving/#findComment-343655 Share on other sites More sharing options...
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