e guerra Posted August 14, 2013 Share Posted August 14, 2013 When my 1995 ch613 350 Mack engine warms up the motor sounds like its not getting enough fuel especially on a hot summer days but in the winter it works perfect... I allready replaced the heads, the injectors, many sensors ans still the same also when the engine gets hot the oil pressure drops to 12-15 psi... I need some help Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/ Share on other sites More sharing options...
2stacksuperdog Posted August 14, 2013 Share Posted August 14, 2013 Hows the radiator? 1 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199812 Share on other sites More sharing options...
e guerra Posted August 14, 2013 Author Share Posted August 14, 2013 Radiator is good Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199813 Share on other sites More sharing options...
2stacksuperdog Posted August 14, 2013 Share Posted August 14, 2013 Sounds like the problem we had with our RD and the radiator looked fine but was starting to over heat changed radiator and brought oil pressure back up to normal and runs perfect now. 2 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199814 Share on other sites More sharing options...
e guerra Posted August 14, 2013 Author Share Posted August 14, 2013 I drained all the old anti freeze and put new anti freeze I cleaned the fuel tanks replaced fuel filter, changed oil.. I just don't know what to do any more.. the truck don't smoke, and the motor has power Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199815 Share on other sites More sharing options...
e guerra Posted August 14, 2013 Author Share Posted August 14, 2013 I drained all the old anti freeze and put new anti freeze I cleaned the fuel tanks replaced fuel filter, changed oil.. I just don't know what to do any more.. the truck don't smoke, and the motor has power Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199817 Share on other sites More sharing options...
h67st Posted August 15, 2013 Share Posted August 15, 2013 If you can get it to a good Mack shop or someplace with a chassis dyno they may be able to figure it out. I worked in a Cat dyno shop and we could watch what was going on when you put a load on the motor...made diagnostics better. Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199939 Share on other sites More sharing options...
Tombstone Posted August 15, 2013 Share Posted August 15, 2013 What motor is it? I have an E7 with external injectors and I have the same problem. It runs good under a load, but after a few miles at about 1600rpm it starts to miss and eventually becomes a clunk, makes the tranny shake and the oil pressure drops from 62psi down to 50psi. Replaced the heads, one of the injectors(#4 was clacking),drained and changed the antifreeze(it was real dark) and still have the problem. Anyone have a clue, would appreciate any feedback. Thanks TOMBSTONE. Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199953 Share on other sites More sharing options...
e guerra Posted August 15, 2013 Author Share Posted August 15, 2013 Tombstone its a Mack E7 350 I have the same problem mine motor missis more when its very hot outside.. in winter when its under 50 deegres it only missis a little I replaced olot of things but now Iam tired of guessing.. I have taken my truck to over 10 mechanics and no one finds the problem... Ohh and it also makes my tranny shake Quote Link to comment https://www.bigmacktrucks.com/topic/32326-engine-not-running-good/#findComment-199960 Share on other sites More sharing options...
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