Hello!
Ive been lurking this forum a lot, and finally pulled a trigger on pre-loved ‘17 Ftype R. A new battery was installed before purchase and I am noticing the exhaust pops and bangs have been subdued. At first I thought it’s probably because of the K309 software update dealer may have done. But I don’t think it’s the software update because if I drive on Dynamic, shut off vehicle, and come back later to start it, it starts on Dynamic. I am suspecting it’s the new battery installed that did something. Has anyone had similar experience? If so, what did you do to get your exhaust acoustic back? I’ve been driving around and today was a little better, but still not like what I’ve heard before.

 

Not going to be the battery.
Software update definitely

" I drive on Dynamic, shut off vehicle, and come back later to start it, it starts on Dynamic" -- They all do that for the next 6hrs after driving. Nothing to do with the software update.

 

My 16R (USA) does not. I can park the car in dynamic turn it off, and then immediately restart it and it will revert to comfort as it starts.

As the poster above said, it's unlikely that the new battery was the cause of subdued crackle.


Edit to add: I still have the pops and crackles

 

Interesting, after reading gazillion threads, I thought one of the signs of the devil “K309” software update was the dynamic mode not automatically activating after restart (regardless of model year). Would an OBD reader tell me what version of the ‘K’ disease my vehicle has? What are my options at this point.

“Edit: I still have pops & crackle” <— how?

 

My 2021 V6 always starts in "normal" mode regardless of the drive mode when the engine is turned off.
My experience with pops and crackles has been underwhelming.
I eventually got JLR to replace the exhaust solenoid valve(s) because I could never detect any difference in tone with the car in dynamic mode or with the exhaust valve switch operated.
I do get the high rev. start-up and sometimes get a loud pop at start-up.
Driving in dynamic mode I still get few pops and crackles even after the new solenoid(s).
However, what I did find is that when I drive in "sport" mode using manual shift, I do get the pops and crackles quite loud and more frequently.
I am guessing it is probably related to using higher revs during up/down shifts.

 

I had the software update that caused dynamic mode to be turned off after each restart, but I still have my pops and bangs. One thing the update did was to reset all my dynamic mode settings to "comfort" so I had to set them properly - could that be what's happened to yours? Though I get the pops and bangs in non-dynamic mode as well (though I have to get the revs up for that), so maybe not your issue.

 

Based on your experience and others I've seen, it confirms that one of the side effects of the K software update is the retention of dynamic mode after the restart. I am not having that problem, hence questioning if it indeed is the software and if the battery did some hard reset.

At what RPM's, do you get the pops? Is it on manual or auto?

I've noticed slight low volume crackles at 3,000 RPM on dynamic+sport, and the only way to get something meaningful is to go dynamic+sport mode+manual, keep at low gear (2nd gear) and let the acceleration paddle go, then hit it again, then let it go etc. Although, it still doesn't feel the same.

 

Thanks for sharing your experience. I don't have a valve issue as I can clearly tell the difference between dynamic and normal mode at start up or even when driving at normal RPMs. It's the crackles that seem very weak. The manual shift at 2nd gear and keeping it at 4000RPM works best, but still not the same.

 

In dynamic I get the pops when I lift off the throttle at more or less any revs so long as I've done a bit of accelerating. In non-dynamic I have to get the revs up around 3,500 to satisfy my ears. Not sure sport makes a lot of difference to the noise, although that mode does tend to keep the revs higher.

 

What you described, is exactly what I am missing ;~(. And I have a feeling it's not the software.

 

The software update that quiets the cars also removed this feature and it was a telltale sign that the K309 software patch had been applied. All the newer ones, and any with the software update, default to normal mode as soon as the vehicle is shut off. If the vehicle doesn't immediately revert back to normal mode then the software patch has NOT been applied.

 

The pedant in me has to point out that normal mode actually activates the next time you start the car, not when you shut off. When I turn mine on it shows briefly dynamic mode (red lights in instrument panel) and then cancels it.

 

Semantics, but yes good catch. The software looks at the last state on start-up and adjusts it if it is in Dynamic mode.

 

If Dynamic mode is not shutting off (albeit I keep it overnight, it does shut off…sounds like after many hours), beats me what may be causing the exhaust note to be softer than usual when leaving the pedal off at high RPMs.

 

Jaguar quotes 6 hours for the "memory life".

 

I’m one of the lucky ones - I had K309b applied years ago, and it had no effect on exhaust sounds.

 

how are you guys checking for the update? be interested to know as mine retains dynamic mode on restart and loves to crackle/pop. assuming no update on mine.

 

I believe you need a ecu reader for it which connects to the OBD port of your vehicle.

If you retain dynamic mode and it still crackles…nothing to worry.

I have something quirky going on with mine.

 

A thought just came to my mind, would a hard reset help?

If so, assuming hard reset is taking off positive and negative terminal for an hour. Can anyone confirm?

Can someone also confirm this procedure once hard reset is done (summarizing info I found on other forum):

1) Start and idle until the engine reaches normal operating temperature.

2) Turn it off for 30 secs and restart it. Idle for two minutes to allow PCM to learn the idle values.

3) Press and hold the brake pedal, select drive and allow the engine to idle for another two minutes.

4) Drive the vehicle for five miles of varied driving speeds/RPM to enable the PCM to complete its learning strategy.

5) Enter radio code which can be found on owners manual(?) or provided by the dealer if VIN is given

 

May not be the same on a 2017 R but on my 2021 R-Dynamic, you find the software version in "Settings" on the center display.
Go to "Settings" ( 2 small cogs) then "All Settings". It shows the current loaded software and you can check for available updates.
Mine has version S22A from 12/24/22 (shown as 24/12/22 on display!).