macaquito Posted January 8, 2019 Share Posted January 8, 2019 (edited) 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 Charles Edited January 8, 2019 by macaquito Quote Link to comment https://www.bigmacktrucks.com/topic/55223-e7-400-loses-strength/ Share on other sites More sharing options...
Mack Technician Posted January 8, 2019 Share Posted January 8, 2019 Need to start with the simple causes like fuel pressure low(test), boost leaks(smoke? High pyro?). Codes? Malfunction light? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55223-e7-400-loses-strength/#findComment-412689 Share on other sites More sharing options...
fjh Posted January 8, 2019 Share Posted January 8, 2019 (edited) 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! NEED FACTS Edited January 8, 2019 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55223-e7-400-loses-strength/#findComment-412737 Share on other sites More sharing options...
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