Reving up at shutdown

jandaso

New member
Joined
Mar 13, 2018
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26
Cummis 6.7 is reving up at shutdown. any idea what it could it be. it started when I changed the rail for a T&C rail.

could it be the pressure relief valve ? It is a 31k. so not sure what could it be. I always had the truck plugged.
 
Last edited:
Are you meaning when you lift off the throttle, or when you turn of the key?
 
My truck just started doing this after installing my injectors, dual cp3 kit, and fish controller. I sort of figured it was a glitch in the cp3 controller. But now I wonder what else it could be.
 
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