cxn613 Posted March 19, 2014 Share Posted March 19, 2014 Code mid 128 sid 5 fmi 5. What should I check? Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/ Share on other sites More sharing options...
Kyle 537 Posted March 19, 2014 Share Posted March 19, 2014 Open circuit code for #5 injector. the plug on the injector. Poor contact or broken wire, that's what I've ran into. Someone else may have more ideas. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238144 Share on other sites More sharing options...
Mackpro Posted March 19, 2014 Share Posted March 19, 2014 Check this outinjector harness.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238145 Share on other sites More sharing options...
cxn613 Posted March 19, 2014 Author Share Posted March 19, 2014 Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238154 Share on other sites More sharing options...
james j neiweem Posted March 19, 2014 Share Posted March 19, 2014 These types of problems couldn't happen on a mechanically popped injector from yesteryear. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238158 Share on other sites More sharing options...
turckster Posted March 22, 2014 Share Posted March 22, 2014 Code mid 128 sid 5 fmi 5. What should I check?First I would check if the engine ecu has oil in the connectors, oil in the connectors can cause false readings/faults. With the valve cover off inspect the wiring insulation, if it is brittle and comes apart then you will need an engine harness. If all looks ok then I would replace the terminals as per the Injector Harness PDF above. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238542 Share on other sites More sharing options...
staxx Posted March 22, 2014 Share Posted March 22, 2014 check were the harness goes over the oil control valve , they get pinched there from the valve cover or being tied to tight and wearing threw the insulation. First check for oil in harness and engine ecu. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-238561 Share on other sites More sharing options...
jnr_ate Posted May 24, 2014 Share Posted May 24, 2014 engine wiring harness too. check for oil at your EECU. oil goes through plug cause it's in a bad place and travels to computer. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-246647 Share on other sites More sharing options...
wheeler73 Posted May 25, 2014 Share Posted May 25, 2014 Oil intrusion and brittle wiring are issues. The engine has positive crankcase pressure which causes the problem. They have an updated oil level/temp sensor and pigtail and oil pressure sensor pigtails that help with the issue as those are both common. Also the oil will push through the injector wiring to the eecu. Have seen some injectors have intermittent issues. Also have seen new harnesses and old harnesses routed incorrectly over the enging brake solenoid and chaffe on the valve cover and also seen them routed incorrectly where they go into the head and rub on tye gear train. Quote Link to comment https://www.bigmacktrucks.com/topic/35092-mp-8-fuel-problem/#findComment-246730 Share on other sites More sharing options...
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