mackdriver33 Posted April 8, 2014 Share Posted April 8, 2014 The Mack pinnacle that I drive has a 445 mp8 engine. The strange thing is that in cold weather the truck runs and pulls great. But when the weather warms up the truck won't hardly pull especially in 9th and 10th gear. Any suggestions? Quote Link to comment https://www.bigmacktrucks.com/topic/35348-no-power/ Share on other sites More sharing options...
bbigrig Posted April 11, 2014 Share Posted April 11, 2014 Get the truck checked at the dealer for leaking cups and injectors. You may be getting combustion gases into your fuel system. Most of our injector cup issues happen as the engine warms up. Are you having any loss of prime issues during start up? You could have other issues here as well. Quote Link to comment https://www.bigmacktrucks.com/topic/35348-no-power/#findComment-241497 Share on other sites More sharing options...
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