That's it, the valves stay closed until 4000rpm is reached and they close again once the engine runs under 4000rpm. On my previous F they opened way faster and stayed open when the Dynamic button was engaged, now the selection of the dynamic and track mode has no effect wath so ever on the exhaust flaps, they stay closed until I go over 4000 or more rpm.

 

He doesn't have an active exhaust switch per his previous post. That said, though, the dynamic button should serve to keep the valves open at all times.

 

I don't think the valves stay open in dynamic mode on cars that don't have the active exhaust button. At least on the AT cars, not sure about the MT

 

On my car, "dynamic" always opens the valves despite the fact it is not one of the 3 programmable parameters (suspension, engine, steering). Of course, I can then close the valves by pushing the exhaust button, but who would want to?.

 

Hmm, in dynamic (with no active exhaust button), my valves open on demand. I have to get the engine working some before the valves open. And they don't just pop open, I can hear them opening up as revs build.

 

Yes I believe that's the behavior on cars that do not have the button - valves only open when engine is under load. Dynamic mode will not keep them open 100% of the time.

Wheras it seems for the cars that do have the button - putting it in dynamic does indeed open the valves 100% of the time.

Am sure it's programmed that way as Jaguar don't want to give the ability to open the valves all of the time to the people who were too cheap to add the exhaust button !

 

I had the K309 done in Mai 2016. Not shure if it did reduce the pops and crackles, as I find that sometimes it seems ok, and sometimes a bit less than before.


I delivered the car in for scheduled service this morning and told them to check for a TSB495 action. They have put it on the service order, and I know that the service technician will do his best to find out of this. He is the only technician that has worked on my car, and he has given my great service every time, and also done a top job on the few warranty repairs I have had done (replaced scratched side windows/replaced seals and front AC-wents that jolted when moving up and Down).


If any software updates are done, and I find that it had a noticable effect, I will report back here.

 

A quick update. "My" service technician just phoned me and asked if it was ok that he applied a 3M tape (transluctant) on the door sills to prevent any scratches on the aluminum plates (free of charges). The other thing he suggested was to apply some copper grease on the hinges on the exaust valves to prevent them from getting stuck half way open (as a preventive maintenance). He said they did look rather ok, but the valve on the passenger side only opened 90%, even though a slight push would open it fully.


He would also see what he could find about the TSB495 and get that solved

 

Just picked up the car, and WOW - the pops and crackles are back in full!

They did do a software update, but I forgot to ask for documentation, and on my receipt it only says "software update" on one line (no charge even though it is now outside warrenty).

To much trafic and to short drive home to really test it out (cold engine), but it's still very easy to hear BIG difference. I almost got embaresed as there was rather crowded on the pavement, and it felt like everyone turned their heads towards the car/sound (more than usual )

 

Hello fellow F Type Community, I've been a long time lurker on the forums but havent posted anything yet (first post).

I have a new to me 2014 Jaguar F Type V8S, purchased last May. I had it checked last June at the dealer, due to the exhaust button not working (loud all the time). Valves were said to be left open all the time. They did some software updates too. Repaired under warranty and all went well. Recently, I just noticed that the Pop and Crackles are somewhat muted between 3k to 4k rpm on deceleration. No problem above and below those rpm range though. If ever it pops and crackles at that rpm range, you can hear that the valves are closed and trying to mute the sound, and opens once again below or above the 3k-4k range.

Is this normal?

Sorry for the long post. Mandatory pictures of the F to follow

 

Not normal. With the button light lit, the valves should always be open.

 

Thank you Unhingd! Do you think this is just a software issue? exhaust (mechanical) issue? Or both? Pop and crackless were really less..

 

I guess this is as good a thread as any to ask this... When you say "over run," does that mean dumping raw gas through the exhaust? I would think that would wreak havoc on mileage/emissions? Maybe a definition of over run perhaps?
Thanks!

 

Yup, yup and yup!

 

Yikes... I'll never want to pop again knowing that
One dealer said that to me, but he didn't know much of anything else, so I said naaaaah....

 

It is engineered to do so, however. They are zeee professionals.

 

It's designed to give great joy. To deny yourself is a sin to all that is petrol holy

 

you can tell that this man celebrates Festivus with the rest of us.

 

Airing of grievances pending

 

Does anyone know if JTB00495 applies to the S, or is it only for V8 models?