6.7 Falling flat on it's face

omega88 · Feb 27, 2014

I've got a 2012 cummins 6.7 with an H&S mini maxx, 5" TBE and CAI. Tonight driving home from work, and it's done it before, the truck just falls flat on it's face for a split second, the kicks right back in again, now I notice it when the truck is not fully warmed up (165F) and when it's considerably cold -20 Celsius and colder. Any thoughts as to what this could be?

NewBlackDak · Feb 27, 2014

Do you see oil pressure spike or drop? Boost drop? Transmission temp jump(slipping)?

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Power247 · Mar 2, 2014

Do you have the throttle valve unplugged? I had something similar happen to me when I first deleted my '12 and that was the solution.

sent thru a cloud of smoke

omega88 · Mar 2, 2014

How do I unplug the throttle valve? And I just notice the boost drop, probably because here's no more airflow.

NWRQC · Mar 3, 2014

EGR "Unplug" instructions

Power247 · Mar 3, 2014

I will see if I can find a pic. On mine it is on the back side of the airhorn/throttle valve assembly NWRQC posted above. It has one of the little red locking tabs that must by slid open before you can unplug it. I was able to unplug mine from above the motor but many say it is easier to reach from underneath the truck.

sent thru a cloud of smoke

Power247 · Mar 3, 2014

This is the view from the back side of the airhorn/throttle valve assembly.

sent thru a cloud of smoke

Power247 · Mar 3, 2014

The connector you need to unplug is under the EGR plug with the pink paint on it.

sent thru a cloud of smoke

omega88 · Mar 21, 2014

When would it for sure be open to unplug? When the trucks off? Kind of a stupid question.

smykowski · Mar 21, 2014

it's safe to unplug if you're running a delete-capable tuner, IIRC it'll throw a CEL otherwise. Unplug it when the truck is off, don't stick your hands anywhere near the fan when it's running! :uhoh2:

omega88 · Mar 21, 2014

Will the engine light turn on everytime I start it, once it's unplugged? Or will I erase it once and that's it?

smykowski · Mar 21, 2014

A delete capable tuner will disable the CEL for the unplugged throttle valve. I'll warn you, I don't have first-hand experience with mini maxx, but the literally hundreds of posts I've read state this is how it works. If you're still unsure, call H&S, I understand their customer service is quite good.

Power247 · Mar 21, 2014

With my RaceME I never get a CEL. Truck starts as normal. You can unplug the EGR after installing the tuner if it makes you feel better but its really not necessary as long as you are running a delete capable tuner. The tuner program replaces the stock program so the truck does not even look for the EGR or DPF.

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NWRQC · Apr 1, 2014

omega88 said:
Will the engine light turn on everytime I start it, once it's unplugged? Or will I erase it once and that's it?

You won't have a CEL upon start up. As Power247 said, the computer isn't looking for the EGR anymore.

6.7 Falling flat on it's face

omega88

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