s13muskrat Posted February 21, 2013 Share Posted February 21, 2013 Im working on a 07 Mack chu613 mp8. When i turn the key on (not starting it yet) the oil presure guage pegs out and doesnt go back, even when i start it. Im hoping its not the guage itself because on this unit you cant just replace the guage, the whole cluster unit has to be replaced. Was also thinking it was the oil presure sensor? Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/ Share on other sites More sharing options...
staxx Posted February 21, 2013 Share Posted February 21, 2013 Check for oil in theengine module connection and oil psi sender common problem Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-166610 Share on other sites More sharing options...
Challenger Posted February 21, 2013 Share Posted February 21, 2013 (edited) Could be the oil pressure sensor. Unplug the sensor and turn the key if the gauge reads 0 with it unplugged the sensor is bad. The oil pressure sensor on an MP8 is the top sensor behind-rear of the engine ecu. You will see two sensors that look the same the top one is the oil pressure sensor and the bottom one is the crankcase pressure sensor. Those sensor do go bad. Edited February 21, 2013 by Challenger Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-166611 Share on other sites More sharing options...
s13muskrat Posted February 21, 2013 Author Share Posted February 21, 2013 Ok Ima go take some things apart. Ill let you know what i come up with. Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-166612 Share on other sites More sharing options...
s13muskrat Posted February 21, 2013 Author Share Posted February 21, 2013 Could be the oil pressure sensor. Unplug the sensor and turn the key if the gauge reads 0 with it unplugged the sensor is bad. The oil pressure sensor on an MP8 is the top sensor behind-rear of the engine ecu. You will see two sensors that look the same the top one is the oil pressure sensor and the bottom one is the crankcase pressure sensor. Those sensor do go bad. Ok pulled the plug gauge reads 0. I have a sensor here so ima replace it and see what happens. Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-166614 Share on other sites More sharing options...
s13muskrat Posted February 25, 2013 Author Share Posted February 25, 2013 Ok it was the oil pressure sensor. I replaced it and all is good now thanx for the help people!!!! Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-167790 Share on other sites More sharing options...
Mackpro Posted February 25, 2013 Share Posted February 25, 2013 Mack has updated that part several times, the newest version looks alittle different. We replace one a week or more in all MP engines. Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-167804 Share on other sites More sharing options...
George h Posted February 2, 2019 Share Posted February 2, 2019 Is the oil pressure sensor a 3 prong or 4 prong Quote Link to comment https://www.bigmacktrucks.com/topic/30084-07-mack-oil-presure-pegged-out/#findComment-414708 Share on other sites More sharing options...
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