Jaytrucking Posted October 22 Share Posted October 22 Truck will be running perfectly, randomly start misfiring and running bad, can shut the engine off and instantly restart the truck and it will run perfectly again tell it happens again. It was happening about 1-2 every coulple of weeks, now it's to the point it happens a couple of times a day. No engine codes Quote Link to comment https://www.bigmacktrucks.com/topic/74665-2007-mack-mp7-misfire/ Share on other sites More sharing options...
Joey Mack Posted October 22 Share Posted October 22 So there arent any codes... Is the fuel hand primer leaking? Its been a while, but i have found the coupler between the tandem pump worn to a point where is was affecting fuel delivery.. but, its been so long now since i messed with MP's.. have you tried to wiggle the engine harness while its running to see if you can duplicate the issue? Still should have codes though.. has anyone been working on the back of the engine, through the dog house? Quote Link to comment https://www.bigmacktrucks.com/topic/74665-2007-mack-mp7-misfire/#findComment-560532 Share on other sites More sharing options...
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