Cummins ISB 6.7 EGR/Frequent Regen Tip

Clogged EGR delta pressure sensor port demo.

[jacksonpuckett]

Yes yes yes If you are watching this video and reading this comment. This is an extremely common issue on the ISL and ISB engines. Usually the faults are for Intake Manifold Pressure, EGR system/valve (abnormal rate of change), regen too frequent, and aftertreatment related codes... ALWAYS start here. Personally I always remove the EGR Valve, crossover tube, differential preasure sensor aka delta sensor, "air mixer" or the intake where the throttle plate is and the EGR valve bolts to. They are always heavily soot caked. Clean all that old soot out until none is left. Also look for the little allen plug or plugs on the air mixer, sometimes there are more than one. Remove the plug. Clean in here as well. Reinstall everything. Your engine is now breathing again and is also sensing correct pressures because your sensing ports are no longer clogged.

[elmnt]

If you take that air intake connection assembly off (where your pressure sensor mounts to) you’ll see on the backside there’s a hex head plug in it. Remove the plug and run a pick through the ports. It’s usually neglected because you don’t see it

[mattdeckert]

VERY important video, seems to be common on these engines that idle a lot or make lots of in town delivery's.

[RHILTONJR]

First place I always check is my DPF pressure sensor and tubes if I am having frequent regeneration issues.

[bleusmyboy]

I use the TerraClean tool and products to clean the entire system in about 1.5 hours. I do not have to remove the valve, I hook in at the temp sensor, remove the egr actuator, and replace it with a thumb screw plate so I can open and close the valve. The system cleans the intake, grid heater and the combustion chamber, egr, egr cooler, turbo, and dpf. Basically everything "tip to tailpipe" Excellent video however, the TerraClean system has been life changing.

[corywalters]

They needs cleaned every 150k the differential port as well. Thats from Cummins, but on the class 4-8 they don’t recommend at that interval. Do it anyway and it will prevent this.

[kevinhancock]

So that the same as differential pressure ? Im assuming so ? Ty

[svtedge]

do you have to perform a relearn on the new dps? I have had dealings with these on Detroit DD15's that require a relearn sequence. I dont know if the ISB's are the same procedure or not.

[JohnnyAnderson]

working on a ISC at the moment and 1 port is completely blocked, I pulled cleanout plug and have used wire and carb cleaner and brake cleaner. I still cannot get any air flow through the port, any recommendations? Thanks