mcratchet1 Posted Wednesday at 05:53 PM Share Posted Wednesday at 05:53 PM (edited) Hey everyone so I have another strange issue. 2013 mru 613 mp8 motor Driving truck back from job and felt it missing and losing power. At shop checked 2 active codes injector 1&3 open circuit. Shut truck off to cool ate lunch. Started truck up to move and it’s running perfect no more miss or active codes. Is this maybe a short or damaged wire to injector harness? Any help would be appreciated just don’t want to get stuck somewhere Edited Wednesday at 05:54 PM by mcratchet1 Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/ Share on other sites More sharing options...
fjh Posted Wednesday at 05:59 PM Share Posted Wednesday at 05:59 PM 3 minutes ago, mcratchet1 said: Hey everyone so I have another strange issue. 2013 mru 613 mp8 motor Driving truck back from job and felt it missing and losing power. At shop checked 2 active codes injector 1&3 open circuit. Shut truck off to cool ate lunch. Started truck up to move and it’s running perfect no more miss or active codes. Is this maybe a short or damaged wire to injector harness? Any help would be appreciated just don’t want to get stuck somewhere this maybe a short or damaged wire to injector harness? Yes It can be also caused by injector cups and pin connections ! The only way to find out is too ! pull the valve cover and check ! Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585792 Share on other sites More sharing options...
mcratchet1 Posted Wednesday at 06:19 PM Author Share Posted Wednesday at 06:19 PM Doing that right now the guy a bought the truck from a year ago had all 6 injectors replaced beginning of 24. I don’t know if cups were changed. Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585796 Share on other sites More sharing options...
fjh Posted Wednesday at 06:24 PM Share Posted Wednesday at 06:24 PM the wiring is shit on these ! It being soaked in oil and heat adds to its shittyness! Also look for oil push at engine ecu plug The sump sensor is also chronic ! The base engine is good aside from cups ! the bolt on stuff is debatable Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585797 Share on other sites More sharing options...
mcratchet1 Posted Wednesday at 07:09 PM Author Share Posted Wednesday at 07:09 PM Ok thanks, this is my first mp8 I have had all e7 past 20 years. The blowby tube that comes out of cover. Does that twist out or take the cover off with it Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585802 Share on other sites More sharing options...
mcratchet1 Posted Wednesday at 08:01 PM Author Share Posted Wednesday at 08:01 PM I got cover pulled I do not see any damaged wires or looses plugs. What would be the next thing to check Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585806 Share on other sites More sharing options...
mcratchet1 Posted 10 hours ago Author Share Posted 10 hours ago Well I think I found the problem brittle wires and coating coming off in wiring harness right where it bends over air compressor. The harness is a complete engine harness. 1800. Anyone replaced one before? Just wondering if I should try to do it I called Mack they charge 12 hrs for it at 195.00/hr Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585874 Share on other sites More sharing options...
Joey Mack Posted 8 hours ago Share Posted 8 hours ago The injector harness is seperare. And yes... the insulation falls off Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585876 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago 3 hours ago, mcratchet1 said: Well I think I found the problem brittle wires and coating coming off in wiring harness right where it bends over air compressor. The harness is a complete engine harness. 1800. Anyone replaced one before? Just wondering if I should try to do it I called Mack they charge 12 hrs for it at 195.00/hr How long can you afford to be down! Take lots of pictures if you do it yourself! It’s an asshole job and that’s why it’s twelve hours! There is very little that isn’t an asshole job on these new units! A simple 5 minute belt change takes an hour! They are made intentionally hard to discourage people in my opinion!And to pissoff mechanics trying to do there jobs! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585879 Share on other sites More sharing options...
mcratchet1 Posted 7 hours ago Author Share Posted 7 hours ago (edited) Ok thanks for the advice Edited 7 hours ago by mcratchet1 Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585880 Share on other sites More sharing options...
fjh Posted 4 hours ago Share Posted 4 hours ago 2 hours ago, mcratchet1 said: Ok thanks for the advice Sorry I couldn’t be more encouraging! Take it slow and steady and pay attention pictures pictures! Quote Link to comment https://www.bigmacktrucks.com/topic/76167-intermittent-injector-codes/#findComment-585893 Share on other sites More sharing options...
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