Refined Trucker Posted November 4, 2014 Share Posted November 4, 2014 I have a slight miss I guess you would call it. Not a complete dead cylinder just sounds like one hole not firing completely. Really noticeable at 800 rpm to 1000. I installed new Rochester stage 2 injectors about 3500 miles ago. But beleive it was acting this way prior to new injectors it was just very slight. Just wandering if this could be a weak unit pump. My first Mack so I'm still learning. Any input will be appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
wheeler73 Posted November 5, 2014 Share Posted November 5, 2014 Possibly a weak unit pump. Also check your fuel pressure. When was the last time a valve adjustment was done? Quote Link to comment Share on other sites More sharing options...
Refined Trucker Posted November 6, 2014 Author Share Posted November 6, 2014 When injectors replaced did an overhead as well. Thanks for input I will have the fuel pressure checked and unit pumps Quote Link to comment Share on other sites More sharing options...
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