You can clean the throttle body. Also check for a sticking butterfly flap in the throttle body. ( a lite sanding of the edge may be in order)

 

Thanks @gmfain ! Watched a video yesterday where the butterfly flap had shifted to one side and the mechanic recommended using a trim tool to re-center it. Will try both sanding and re-centering techniques if that is the culprit. Appreciate you.

Video here for good measure:

 

@mtaylo32 Have you progressed on this at all? I'm new to the TD6 world, but my 2019 has been exhibiting the same behavior. When it is cold, usually leaving work where I have many lights, it does the little "shutter stumble" ever once in a while. Once warm, I don't notice it.

My Disco is ~70k miles. New to me, but just had a full service from the JLR dealer before I bought it (All fluids/filters, diff/transmission, etc).

I have not cleaned the sensor or checked the TB yet, but will this weekend.

 

@tss118 I never found a solution other than lately temperatures have been above 50 degrees in the morning causing the car to warm up faster and it now seems to drive normally. My car is now able to get up to operating temperature before the first stoplight that I was experiencing that stalling feeling. I have read on here that it could be a symptom of the turbo and engine not being up to temperature yet to avoid any damage. My truck has ~134,000 miles so I would assume to turbo is a little more worn than most and maybe that feeling has been exaggerated due to wear and tear, not sure.

 

Thanks for the response @mtaylo32 . I cleaned the MAP sensor last night so we'll see how it is leaving work today. The truck seems fine leaving my garage in the morning. This stumble is related to leaving the office. My Disco is in a temperature controlled underground parkade. I usually have to hit 4-5 lights asap before I free flow. The stumble happens just off idle or rolling to a stop at lights in very slow stop/go traffic. Once I get moving and things are flowing, it is fine after that.

No codes, but I'll maybe start monitoring some random PIDs to see if anything presents itself.

 

Does stumbling mean low RPM or engine stall or just degradation in power/performance when engine cold vs. warm?

Mine does have lower power for the same throttle inputs cold vs. warm. Now, if I "give it the onions" when it's stone cold the engine will come life, but I try not to do that. As an engineer working in the diesel truck industry I do know we design software safeguards to protect less informed drivers to thrash on cold engines, which will degrade engine/drivetrain longevity. Maybe this is Land Rover's attempt at that, albeit a less than elegant solution.

Personally, if we're talking about the same "problem", I wouldn't be very concerned.

 

@RyanLR3 This stumble happens at idling speeds coming up to or leaving a stop. The RPM drop down and it feels like the vehicle is on the verge of stalling, then it picks back up and recovers. I never give a cold vehicle the beans. The RPM drop is noticeable on the gauge and the vehicle will give a shudder/stumble as it feels like it is on the verge of stalling.

There is a chance this could also be transmission related. This Disco just had the fluids/pan/filter done and is relatively low mileage. The ZF is a stout unit that I've had in many other vehicles. I may dig into doing a reset adaptation on the transmission so it relearns my driving habits.

 

Did you ever have anymore issues with this? I've got a 2016 L405 that's exhibiting similar symptoms, longer crank that normal plus stalling on cold starts along with occasionally stalling when stopped at red lights.

 

I had my Disco tuned and deleted. All problems gone. I assume the low rpm issue was due to the EGR. At low rpms when the EGR valve is opening/closing causing the stumble.

 

Gotcha thanks for the response