Dylank94 Posted October 24, 2018 Share Posted October 24, 2018 My 2013 GU with a MP7 is not getting up to tempature when regening. The regen is ignitiated the truck stumbles and shakes and egts get to 750ish and had 3 psi of boost then a few seconds after it reaches that tempature boost goes up to 24psi and the egt from the motor goes down to 500ish and the dpf and outlet go to 600ish and it will stay in regen and soot will slowly go up. I know 24psi boost is too much during regen i dont get why the truck gets up to temp when its running rough but once boost climbs it runs smooth but egt's go down so it doesnt actually burn off. Check fuel filters popped up on the dash today but i changed them 2k miles ago. Anyone have any idea why its running crappy in the beginning and then over boosting and running fine during the regen? I had a code for 7th injector code was spn 5443 fmi 7but i cleaned the tip and tested it it sprays well and code hasnt returned. Quote Link to comment https://www.bigmacktrucks.com/topic/54659-2013-gu713-mp7-cold-regen/ Share on other sites More sharing options...
fjh Posted October 25, 2018 Share Posted October 25, 2018 We have had injector cup issues cause this! Have you had issues starting it?? Quote Link to comment https://www.bigmacktrucks.com/topic/54659-2013-gu713-mp7-cold-regen/#findComment-408462 Share on other sites More sharing options...
Dylank94 Posted October 29, 2018 Author Share Posted October 29, 2018 We replaced the 7th injector even though we cleaned it. It wasnt spraying enough fuel and that fixed it. Quote Link to comment https://www.bigmacktrucks.com/topic/54659-2013-gu713-mp7-cold-regen/#findComment-408678 Share on other sites More sharing options...
fjh Posted October 30, 2018 Share Posted October 30, 2018 Thanks for posting your fix! Quote Link to comment https://www.bigmacktrucks.com/topic/54659-2013-gu713-mp7-cold-regen/#findComment-408704 Share on other sites More sharing options...
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