Does anyone know the source of an audible clunk noise which occurs the first time the car exceeds 16 kmh / 10 mph after starting the engine?

Thanks,

Bob

2011 XF, V8, Luxury Premium Edition, 70,000 km

 

That will be the doors locking!

 

I guess that could have been a possibility for some, however my doors are set to lock at 32 kmh. Made me smile, though. Reminds me of being a computer technician and having to start the support call with the question, "Is your computer plugged into the power?" :-)

This is a much quieter sound which seems to come from the engine or transmission areas.

 

i have the same noise at same speed(around 20km/h maybe) nd i think its torque converter lock up

 

Funny it is only once every trip, not each time the car accelerates to this speed. I noticed the parking assist screen shuts off at the same time (after backing out of a space) and wondered if there was some sort of mechanical interlock that was letting go. Have you had yours checked out by a mechanic (or are you not concerned)?

 

yes only once after car start drive. and sometimes its less noticeable if car warm up. I;m pretty sure its torque converter and or gearbox. I have changed both converter and gearbox and car does the same. which engine do you have 4.2SC or 5 NA?

 

Okay, good to know someone else has heard it. I'll not make a special trip to the mechanic for it but will mention it at the fall servicing before I put the car away for the winter.

Mine is V8 5.0 litre, without supercharger.

Thanks,

Bob

 

It's the ABS system. It does a self check of the system around 5 or 10mph (I forget which) the first time you pull away.
Perfectly normal. And in fact reassuring that it works!

 

Hi BritCars, Your post makes sense to me. Thanks for weighing in.

Regards,

Bob

P.S. Question closed for me!