kahall82 Posted December 24, 2013 Share Posted December 24, 2013 Hi all,If you could please check out the link to my YouTube clip. http://www.youtube.com/watch?v=O6tLOXM4DBADoes it sound like it is running OK. Seems to pulse on idle (sometimes it is fine though) and really pulses when you just touch the accelerator as you can hear in the YouTube clip. You really need to put your foot down but when you change to the next gear it does the same until you really put your foot down.May be just how the truck is...our 350 R688RST is completely different.Any advice would be much appreciated!Thanks Steve Quote Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/ Share on other sites More sharing options...
kahall82 Posted January 21, 2014 Author Share Posted January 21, 2014 Come on everyone!! Just worried that something is wrong in the fuel pump. Any ideas would be most appreciated!! Quote Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/#findComment-227902 Share on other sites More sharing options...
gearhead204 Posted January 21, 2014 Share Posted January 21, 2014 it sounds like the buffer screw is set too loose. Set eng. low idle to 50 rpm less than spec. then turn buffer screw in until idle comes up 50 rpm then try truck should improve drivabilty a whole bunch Quote Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/#findComment-227904 Share on other sites More sharing options...
mrsmackpaul Posted February 2, 2014 Share Posted February 2, 2014 (edited) mate had the same thing on my 320 coolpower and it needed the heads done up then it idled perfect but I think this was the exception rather than the norm a compression test will soon tell the difference the normal cause is the governer is warn out I had changed my injector pump but it made no change then I had to start looking further hope this is of some help seeyaPauldoes it start fine ??? Edited February 2, 2014 by mrsmackpaul Quote Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/#findComment-230012 Share on other sites More sharing options...
39 Baby Mack Posted February 2, 2014 Share Posted February 2, 2014 How about looking at the governor lever on the pump, sounds like the over center spring is broken.Ron Quote Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/#findComment-230014 Share on other sites More sharing options...
theakerstwo Posted February 2, 2014 Share Posted February 2, 2014 And sometimes the engine mounts are bad. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/#findComment-230016 Share on other sites More sharing options...
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