Rilex Transport Posted September 12, 2021 Share Posted September 12, 2021 Hello Ricky is back for help. 2008 Mack mp8 . Just replaced injectors cups, new injectors. But first load 4400 lbs and I don't have power that I used to have when pulling thru Iowa small hils I have to lower gears. Also I find out that engine brake does not hold like before repairs. I did repairs at Housby in Des Moines. Any help what to do next. Manifold pressure goes max to 30 psi out of 40 when padal is to the floor. Quote Link to comment https://www.bigmacktrucks.com/topic/68090-low-power-after-injector-replacement/ Share on other sites More sharing options...
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