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E7-400 loses strength


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Hi guys, I have a mack vision, with E7-400 engine and loses power when facing a climb, I have to reduce gears very fast, I reach a low 5 and the speed is only 15mph and does not give more, I hope some help
Edited by macaquito
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13 hours ago, macaquito said:

hello and thanks for the help, I discovered that the ECU, is not the original motor, it can affect that

PLEASE Answer the questions above !!! yes the ecu can effect power But need to address the physical issues first!  Its a waste of your/our time Guessing At stuff!


Edited by fjh
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