06 Cummins Cutting out - Competition Diesel.Com

Yotadzl · 11-17-2017, 09:35 AM

I just installed a Super Phatshaft 64, 50 HP injectors, FASS titanium, and EFILive on an 06 Cummins. After the install I have a serious "cutting out" issue under load. Anywhere from about 25%+ throttle input the engine will cut out intermittently and lose power for roughly a half second at a time. It feels like the boost signal is being lost or the cam/crank sensor is missing counts, but I tried new sensors in all of those to no avail. I have returned the tuning to stock and unplugged the Edge display. I have logged data with the edge and all I see dropping briefly is boost and RPM. RPM may drop a couple hundered and boost drops a max of 8-10 psi from about 40. It then quickly recovers. No codes are setting. Has anyone experienced something like this caused by a turbo or injectors? It doesn't seem likely but I'm grasping for straws here.

Sanger · 11-17-2017, 09:57 AM

How's your rail pressure? RPRV dumping pressure?

Yotadzl · 11-17-2017, 10:18 AM

Rail pressure is stable. I logged it when it was cutting out and there was barely a blip in the pressure.

Cummins6.7trip · 11-17-2017, 01:06 PM

I know its a long shot but I worked on a truck that did something similar to yours an we couldn't figure it out so he kept driving alternator took a dump a little after replaced it an the problem disappeared with it.

Is the edge the only programming on the truck if so i'd unhook it an see if that changes anything.

Did you try a new map sensor?

Yotadzl · 11-17-2017, 03:18 PM

It's easy enough to unhook the alternator and take it for a spin. I might try that. The Edge has been unhooked yes. I had an EFILive csp5 tune in it, but put it back to stock while diagnosing the issue. Ya i tried a used map sensor I had, no difference.

Yotadzl · 11-17-2017, 06:39 PM

I think I may have figured it out. Turns out the truck has an aftermarket remote start setup on it. One wire is tapped into a wire on the ECM, probably for an RPM signal. I unhooked the wire and the problem seems to have gone away. I need a few more drives to be sure because it was intermittent, but it was acting up all day until I unplugged it. I effing hate aftermarket alarms and remote starts. More problem than they are worth.

11-17-2017, 09:35 AM	#1
Yotadzl Name: Yotadzl Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2016 Location: Oregon Member`s Gallery Posts: 234	06 Cummins Cutting out I just installed a Super Phatshaft 64, 50 HP injectors, FASS titanium, and EFILive on an 06 Cummins. After the install I have a serious "cutting out" issue under load. Anywhere from about 25%+ throttle input the engine will cut out intermittently and lose power for roughly a half second at a time. It feels like the boost signal is being lost or the cam/crank sensor is missing counts, but I tried new sensors in all of those to no avail. I have returned the tuning to stock and unplugged the Edge display. I have logged data with the edge and all I see dropping briefly is boost and RPM. RPM may drop a couple hundered and boost drops a max of 8-10 psi from about 40. It then quickly recovers. No codes are setting. Has anyone experienced something like this caused by a turbo or injectors? It doesn't seem likely but I'm grasping for straws here. __________________ '85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun! '95 Cummins grampa truck, embarrassingly stock '12 Cummins, deleted

11-17-2017, 10:18 AM	#3
Yotadzl Name: Yotadzl Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2016 Location: Oregon Member`s Gallery Posts: 234	Rail pressure is stable. I logged it when it was cutting out and there was barely a blip in the pressure. __________________ '85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun! '95 Cummins grampa truck, embarrassingly stock '12 Cummins, deleted

11-17-2017, 03:18 PM	#5
Yotadzl Name: Yotadzl Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2016 Location: Oregon Member`s Gallery Posts: 234	It's easy enough to unhook the alternator and take it for a spin. I might try that. The Edge has been unhooked yes. I had an EFILive csp5 tune in it, but put it back to stock while diagnosing the issue. Ya i tried a used map sensor I had, no difference. __________________ '85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun! '95 Cummins grampa truck, embarrassingly stock '12 Cummins, deleted

11-17-2017, 06:39 PM	#6
Yotadzl Name: Yotadzl Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2016 Location: Oregon Member`s Gallery Posts: 234	I think I may have figured it out. Turns out the truck has an aftermarket remote start setup on it. One wire is tapped into a wire on the ECM, probably for an RPM signal. I unhooked the wire and the problem seems to have gone away. I need a few more drives to be sure because it was intermittent, but it was acting up all day until I unplugged it. I effing hate aftermarket alarms and remote starts. More problem than they are worth. __________________ '85 Yota Crawler-2l diesel, custom built VE (by me), custom T25 turbo. Slow but fun! '95 Cummins grampa truck, embarrassingly stock '12 Cummins, deleted

11-17-2017, 09:57 AM	#2
Sanger Name: Sanger Title: Too Much Time Status: Not Here Join Date: Dec 2010 Member`s Gallery Posts: 351	How's your rail pressure? RPRV dumping pressure?

11-17-2017, 01:06 PM	#4
Cummins6.7trip Name: Cummins6.7trip Title: Green Behind the Ears Status: Not Here Join Date: Aug 2015 Location: Pa Member`s Gallery Posts: 76	I know its a long shot but I worked on a truck that did something similar to yours an we couldn't figure it out so he kept driving alternator took a dump a little after replaced it an the problem disappeared with it. Is the edge the only programming on the truck if so i'd unhook it an see if that changes anything. Did you try a new map sensor?