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MountainMech

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About MountainMech

  • Birthday 01/12/1962

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    Colorado City CO.

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    Wrenching, Fishing, Raising the family
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    Male

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  1. Thanks Big Dog .I will let you know this coming week ,and by the way after reading my own post over i noticed i had left out that the ABS light is on as well,i found that the rear left sensor cable is ripped , the driver never mentioned that the light was on ! well i ordered a new one from Denver Mack and it should be in UPS by tomorrow.I will keep ya posted KEEP ON TRUCK-EN . Randy.
  2. First of all Hi to Ya`All ,i went through all the post`s that sounded like it may pertain to my problem and found this one to be a close match, well I am dealing with a 2001 rd688s with the e7 350 the truck will on a test drive (that is all its good for right now )when i take it on a slight grade the check engine light goes on,the speed o quits and the truck will only operate at the very low step of the foot switch, a "Limp Home Mode " feel to it like some passenger cars will do . I have tested the bats each with a carbon pile tester that can handle the 1000 amp bats, cleaned all cables ,grounds at every point IE frame, engine,starter ect.ect. i had a new speed o sensor so swapped it out,checked not all but allot of harness connections that i felt could cause problems , i did find engine oil in the top connector of the ECM plus the fasteners at the bottom of the ECM were both broke (no telling how long its been banging hard as this truck sees allot of rough dirt roads, i removed the ECM opened it up found no oil inside , cleaned everything up mounted it back solid. I had a new starter from Mack as a back up and after hearing from others in the past abut internal shorts causing probs went ahead and swapped it,tested the ignition switch while driving checking voltage at all hot sides during the fault and all stays hot, i checked all power relays and trip fuses and all are ok , now the code i have is 4.2 this is i believe "Fan Clutch Output " OK ,the fan clutch works great engine does not get overheated (been 101 here lately)Well i have tested so much and all the while doing as i described above i would test drive the truck each step of the way ,and all most without exceptions the truck would at the slight grade on dirt ,no more bumpy that the asphalt i drove on to get to my test spot the thing would drop to the low end of the foot switch ,and the speed o would go off .Now if i creep to level ground set the brake and shut it down and turn the key the correct lights come on then off and she will start and be fine unless i continue uphill ,sometimes down as well but rare.Ok i am long wended but just wanted to give allot of info as possible, or maybe just venting the frustration lol .Well i will take all the advice you have and will greatly appreciate the help ,until then i will enjoy reading the posts about anything that sounds interesting to learn about . Thanks Again Randy.
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