Longhauler Posted December 3, 2021 Share Posted December 3, 2021 Deleted truck Truck runs fine until you reach higher gears. Misses and loses power almost like its not getting fuel. If you manually get the rpms over 1300 truck runs fine. Fuel system and lines checked, turbo checked, number 1 injector replaced, new ecm. Nothing has worked. Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/68866-2012-mp8-losing-power-in-high-gear/ Share on other sites More sharing options...
Ox50 Posted December 10, 2021 Share Posted December 10, 2021 Any update I have a similar problem at times my truck will run at 65% others it’s just dead in the water not building boost Quote Link to comment https://www.bigmacktrucks.com/topic/68866-2012-mp8-losing-power-in-high-gear/#findComment-484670 Share on other sites More sharing options...
Knockoutmack Posted December 16, 2021 Share Posted December 16, 2021 Any updates. Exact same issues. Quote Link to comment https://www.bigmacktrucks.com/topic/68866-2012-mp8-losing-power-in-high-gear/#findComment-485251 Share on other sites More sharing options...
Joey Mack Posted December 16, 2021 Share Posted December 16, 2021 deleted??? that is where the problem started.... the EECU is smarter than that... Leave the EGR system alone and keep it in good repair... -or- sell it and get a real truck.... Sorry but the Gov. made sure that you cant really beat the system... at some point you will PAY... When I worked at the MackVo dealership, a few years ago, we were not allowed to touch a deleted truck.... So you are left to take it to a private shop... Then the 'Hack's' come out of the woodwork with "The solution".. you pay them 3-5K ... you go away and do youre thing, then you have an issue... and guess what? youre screwed... sorry guy's .. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68866-2012-mp8-losing-power-in-high-gear/#findComment-485255 Share on other sites More sharing options...
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