Cooldown before Shutdown?

[NorthStar]

If you're a techie kind of person buy yourself a gauge or use an OBDII reader and Smartphone and monitor your EGT's. It will become quite obvious to you that it would be wise to let it cool down a bit rather than shut it off at 800° after towing. Everything gets real hot from the Turbo inlet through the emission system. If you turn it off in the middle of a regen your DPF can be over 1200°F.

Agree. A simple $99 OBDLink MX+ with their software that comes with it will easily show the temps plus a number of other PIDs. The screen shot below is when the truck was shut down but will grab one when running as the temps can easily reach 800 to 900 degrees and even higher during regen. Updated pics…center pic is at 70 mph…far right pic is after 2:00 minute cool down.

 

[bill-e]

Here's the edge CTS3 after a 5 mile local drive to the market. Didn't even have enough time to come up to operating temps. Temps on the left are EGT 1-Turbo Inlet, EGT3 right before the DPF and then DPF Inlet temp. Oil and coolant down the right side.

 

[ramtacular]

I'm not sure how important it is to idle for a few minutes the truck after parking.. I think most of the time you are running it at a very low load the last minute or so before parking. For example, I recently pulled a 3,500# boat on a long trip on the interstate. The chart in the manual says I should idle the engine for 1-minute - but when I get off the highway to get fuel, rest, or eat the truck spends several minutes negotiating the off ramp, a light or two, and then the parking lot of wherever I'm stopping. I think that is sufficient.

 

[Fuzznutz]

Here's the edge CTS3 after a 5 mile local drive to the market. Didn't even have enough time to come up to operating temps. Temps on the left are EGT 1-Turbo Inlet, EGT3 right before the DPF and then DPF Inlet temp. Oil and coolant down the right side.

True egt temps come from an aftermarket probe drilled and tapped into the manifold. Need to add 300 to 400 degrees to any of those readings past the turbo and in the pipe.

Sent from my SM-A426U using Tapatalk

 

[PLRX]

I always let it idle 90 seconds, even if I didn't tow. IMO, it's a good diesel habit.