sgosine577 Posted January 28, 2012 Share Posted January 28, 2012 I have a 1988 mack mr600 series. I rebuilt the injector pump and injectors because it was smoking. Now I can only get a max of 55 MPH on the highway. I need help. Quote Link to comment https://www.bigmacktrucks.com/topic/22925-can-get-max-55mph-on-88-mack-mr600/ Share on other sites More sharing options...
Rob Posted January 29, 2012 Share Posted January 29, 2012 I have a 1988 mack mr600 series. I rebuilt the injector pump and injectors because it was smoking. Now I can only get a max of 55 MPH on the highway. I need help.You have disturbed the calibration of the governor. I would pull the pump and get it into a shop for proper calibration for hi, and low idle speeds. You can adjust these settings yourself and replace the throttle arm but it is best left to be set professionally. Overspeeding the engine is not good for parts.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22925-can-get-max-55mph-on-88-mack-mr600/#findComment-100119 Share on other sites More sharing options...
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