tims59 Posted November 29, 2012 Share Posted November 29, 2012 there is two 42 pin connectors gong to ecm..i unhooked the bottom one to do a pinpoint test for doser valve problem and it was soaked with fuel...could it be coming from cooling plate? Quote Link to comment https://www.bigmacktrucks.com/topic/28602-mp7-ecmfuel-coming-out-of-bottom-electric-connector/ Share on other sites More sharing options...
Mackpro Posted November 30, 2012 Share Posted November 30, 2012 Unplug the fuel pressure sensor and the 7th injector fuel pressure sensor on the fuel shutoff valve block and see if thats were the fuel is seeping in from. Usually its oil in the engine ECM connectors from oil pressure sensor, the oil level sensor or the piston cooling oil pressure sensor. I bet 75-80 % of the MP engines that are 2 years or older that come through our shop have oil in the ECM connectors. Just the nature of the beast. When under warranty, we replace the sensor and harness. At one point we had enough engine wiring harnesses to fill the bed of a pick up to the top. Took them to the copper recycler. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/28602-mp7-ecmfuel-coming-out-of-bottom-electric-connector/#findComment-148714 Share on other sites More sharing options...
tims59 Posted November 30, 2012 Author Share Posted November 30, 2012 i am losing voltage to 7th injector when i activate it with v cads...injector won't turn on...i have 4.2 volts when injector is unhooked...but when hooked back up it goes to .8 volts...wiring and plug connectors are good...could the oil have seeped into ecm? Quote Link to comment https://www.bigmacktrucks.com/topic/28602-mp7-ecmfuel-coming-out-of-bottom-electric-connector/#findComment-148747 Share on other sites More sharing options...
Mackpro Posted November 30, 2012 Share Posted November 30, 2012 I have see just acouple of ECM's that got filled up with oil, kinda rare but it could happen. We had an older MP-8 that had low voltage to 7th injector and found that the driver side windshield was leaking water into the fuse box in the kick panel and was causing low voltage. I didnt work on this truck but I remember we changed out the fuse box and it fixed it. Quote Link to comment https://www.bigmacktrucks.com/topic/28602-mp7-ecmfuel-coming-out-of-bottom-electric-connector/#findComment-148764 Share on other sites More sharing options...
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