96bulldogpower Posted Wednesday at 02:51 AM Share Posted Wednesday at 02:51 AM Hey guys looking for help again on this one. Dealing with a 2012 granite with the mp7. The problem started when the dash requested a regen “SOON”. I tried to regen the truck with the dash switch and it would only raise the idle and drop after 3 seconds. I hooked it up to PTT and discovered spn3675 fmi7 for a fault on the turbo bypass valve. I diagnosed a faulty valve, replaced it and verified its function then it allowed me to properly start a regen. When it first started a regen the truck blew HEAVY gray smoke for a while, the regen lasted just over an hour when it was interrupted by the low fuel light. I quit that day and tried again today, filled the truck with fuel and tried another regen. Now the dash says regen “REQUIRED” I allowed it to regen and it lasted over 2.5 hours with no signs of stopping, I stopped the regen because I had to be out of the yard by a certain time. No codes are present, egt’s while regening are around 750° at their highest, differential pressure has now dropped to about .03-.06 but it still blows a little gray smoke while it’s in regen, on jpro it says soot level is at 48% and I can’t get it to drop, also truck is in low derate. I’m not sure how to proceed, anyone have any tips on what to do or check? I’ll attach a pic of my jpro screen. Quote Link to comment https://www.bigmacktrucks.com/topic/74876-2012-mp7-regen-will-never-end/ Share on other sites More sharing options...
fjh Posted Wednesday at 02:05 PM Share Posted Wednesday at 02:05 PM Not a guru on this however It sounds like you have a crack in the dPF there should not be any smoke! Think you need to pull it and inspect! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74876-2012-mp7-regen-will-never-end/#findComment-564222 Share on other sites More sharing options...
steeler Posted Thursday at 02:35 AM Share Posted Thursday at 02:35 AM Exhaust temp is not high enough, and 260 degrees before cat? That can't be right.. When I have whacky exhaust temps I'm looking at 7th injector, face plugged cat, temp sensors... Quote Link to comment https://www.bigmacktrucks.com/topic/74876-2012-mp7-regen-will-never-end/#findComment-564261 Share on other sites More sharing options...
The Heinz Posted Thursday at 01:00 PM Share Posted Thursday at 01:00 PM 10 hours ago, steeler said: Exhaust temp is not high enough, and 260 degrees before cat? That can't be right.. When I have whacky exhaust temps I'm looking at 7th injector, face plugged cat, temp sensors... I just saw that, goes from 713° EGT to 260° at the DOC inlet, then up to 666° after DOC? Can't help but wonder if it's the temp sensor. Quote Link to comment https://www.bigmacktrucks.com/topic/74876-2012-mp7-regen-will-never-end/#findComment-564268 Share on other sites More sharing options...
fjh Posted Thursday at 02:01 PM Share Posted Thursday at 02:01 PM fuel pressure cam be another issue with these ! how ever the smoke is not a good thing! the face plug idea is valid but usually a crack with this! Quote Link to comment https://www.bigmacktrucks.com/topic/74876-2012-mp7-regen-will-never-end/#findComment-564273 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.