mackone Posted June 27, 2015 Share Posted June 27, 2015 Hi I got a 1996 DM 688 dump truck that idles low at about 400-500 R.P.M. when warmed up and sometimes wants to die. It starts right back up but just seems to be idling way to low is there a way I can adjust the idle up ? Its has a E7 350 mechanical engine. Thanks Denny Quote Link to comment https://www.bigmacktrucks.com/topic/40680-1996-dm-688-idles-low/ Share on other sites More sharing options...
br549 Posted June 27, 2015 Share Posted June 27, 2015 There is an adjustment bolt and nut on the injection pump.. If I remember it right, take and pull the fuel lever to the front on the pump and you will see a bolt that that lever comes back against when it comes back to idle. I think the head of the bolt is an 8mm wrench and under the pump it take a 10mm wrench to loosen the jam nut and back it off. then turn the 8mm bolt head counter clockwise to raise the idle back up, it should idle on 650 rpm. After setting it if you have a jake brake you might have to reset the pump switch if it don't hit the switch good. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/40680-1996-dm-688-idles-low/#findComment-294867 Share on other sites More sharing options...
theakerstwo Posted June 28, 2015 Share Posted June 28, 2015 I see you have did it before BR549. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/40680-1996-dm-688-idles-low/#findComment-294875 Share on other sites More sharing options...
mackone Posted June 30, 2015 Author Share Posted June 30, 2015 Yep that took care of it idles good now. Thanks br549 Quote Link to comment https://www.bigmacktrucks.com/topic/40680-1996-dm-688-idles-low/#findComment-295045 Share on other sites More sharing options...
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