dickbuick Posted October 29, 2017 Share Posted October 29, 2017 I keep getting code for EGR mass air flow rate valid but below normal Truck has new turbo EGR valve cooler and mass air flow sensor Pressure tested intake cant find the problem Mack has an updated venture tube and sensor but its on back order Any help? Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/ Share on other sites More sharing options...
Mackpro Posted October 29, 2017 Share Posted October 29, 2017 Can you get me an actual fault code number? I think there is a bulletin or 2 on this . And model number and last 6 of vin Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383742 Share on other sites More sharing options...
Mackpro Posted October 29, 2017 Share Posted October 29, 2017 I think this is the 4th or 5th or maybe 6th revision of the EGR differential pressure sensor and Venturi pipe. And yes lots of parts are on back order right now. We waited 3 weeks for the newest EGR diff sensor and pipe kit for a mp7 MRU . I'm waiting on a secondary fuel filter for my buddy's new GU with the common rail engine. You can get in in a kit but alone their back ordered from hell. The common rail engine takes a different secondary fuel filter than the older MP engines. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383744 Share on other sites More sharing options...
dickbuick Posted October 29, 2017 Author Share Posted October 29, 2017 I will get the code # and Vin tomorrow I am away from the trucks today. THANK GOD Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383763 Share on other sites More sharing options...
dickbuick Posted October 30, 2017 Author Share Posted October 30, 2017 GU713 1M2Ax09CM012037 SPN2659 Engine Exhaust Gas Recirculation (EGR) Mass Flow Rate FMI18 Data Valid But Below Normal Operational Range-Moderately Severe Level Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383885 Share on other sites More sharing options...
Mackpro Posted October 31, 2017 Share Posted October 31, 2017 I'll pull it up in the morning and see what we got on it Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383896 Share on other sites More sharing options...
turckster Posted October 31, 2017 Share Posted October 31, 2017 Have you checked the egr diff. psi sensor ports on the venturi? The fault is for low or little flow so one or both ports could be plugged, which is common. If one or both are plugged you might be able to clean them out but eventually the venturi will have to be replaced. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-383922 Share on other sites More sharing options...
dickbuick Posted November 1, 2017 Author Share Posted November 1, 2017 Yes I have cleaned them they were not plugged. I also changed the sensor I thought I would change the venture but my dealer says they are on back order. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384025 Share on other sites More sharing options...
Mackpro Posted November 1, 2017 Share Posted November 1, 2017 Your EGR Diff sensor. Does it have the round plug or is it the newer one with the yellow sliding lock? EGR low flow MP.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384070 Share on other sites More sharing options...
Mackpro Posted November 1, 2017 Share Posted November 1, 2017 This bulletin might not be the newest but shows the old and new type sensors EGR Diff sensors.pdf Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384072 Share on other sites More sharing options...
dickbuick Posted November 1, 2017 Author Share Posted November 1, 2017 Has flat plug with yellow slide lock Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384074 Share on other sites More sharing options...
Mackpro Posted November 1, 2017 Share Posted November 1, 2017 Yep , that's new newest sensor but the Venturi pipe might not be updated Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384076 Share on other sites More sharing options...
dickbuick Posted November 2, 2017 Author Share Posted November 2, 2017 Yes Vevturi pipe is still original I checked with parts again last night he dose have a kit ordered for me but it wont be till late Nov. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384127 Share on other sites More sharing options...
Mackpro Posted November 2, 2017 Share Posted November 2, 2017 Being the code is for low EGR flow. Either the EGR diff sensor is not reading correctly or the cooler is plugged. In the first bulletin it talks about the cooler being plugged and replacing the cooler and updating the ECM programming to prevent the cooler from clogging again. We always try the updated EGR diff setup and a engine ECM update. Then see if it solves issue. If code returns the replace EGR cooler, this is last resort as the turbo bolts usually break off and is never fun. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384156 Share on other sites More sharing options...
dickbuick Posted November 2, 2017 Author Share Posted November 2, 2017 Well about them turbo bolts. When this all started with this code I cleaned the tube replace the sensor cleared the code and went for a road test. Empty ran great no engine light so I went to the quarry half way back the turbo locked up great 73,280 no turbo. So any way when I had the turbo off with the now broken bolts I changed the cooler and valve since they were never changed. So looks like I will be waiting for my new venturi tube Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384179 Share on other sites More sharing options...
Mackpro Posted November 2, 2017 Share Posted November 2, 2017 Ahhhhh that European Reliability....... Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384182 Share on other sites More sharing options...
Lmackattack Posted November 2, 2017 Share Posted November 2, 2017 these new trucks and downtime.... I dont understand it. hope you get it fixed soon Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384183 Share on other sites More sharing options...
dickbuick Posted November 3, 2017 Author Share Posted November 3, 2017 I don't think its just Mack Its just that's what I have if I had Pete or KW I would be on Bigpaccar.com Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384228 Share on other sites More sharing options...
Mackpro Posted November 3, 2017 Share Posted November 3, 2017 Yep, we had just as many KW's in derate as we had Macks this week. Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-384237 Share on other sites More sharing options...
dickbuick Posted December 7, 2017 Author Share Posted December 7, 2017 Well after one month of back order. I changed venture tube and sensor truck has ran with no codes Thanks Mack Pro Quote Link to comment https://www.bigmacktrucks.com/topic/51532-2012-mp8-egr-mass-air-flow/#findComment-386853 Share on other sites More sharing options...
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