Has anyone else had an issue with the active exhaust where the snapping and popping disabled itself? The valves function properly and remain open in active mode, but the spark to initiate the pops and snaps in the exhaust seems to disable itself.

I notice this mostly when driving in manual mode, driving aggressively, and you're on and off the throttle often - tight back roads twisties. Although I have also seen this a few times while cruising in manual mode maintaining speed, where again you're on and off throttle constantly, but in this case not aggressively at all - just maintaining speed with slight on and off throttle.

I've had it into the dealer once. They couldn't reproduce it and without and error code there was nothing they could do.

I have another appontment, but they can't get me in for two weeks, like always - I take my rover to the same dealer, Marin luxury cars. Curious if any other owners have experienced this issue?

 

Did you first experience this problem right after it went into the dealer for the O2 sensor software updates. If so, there are entire threads on this issue.

 

I also have a '16 R and not only do I notice that it sometimes gets a little quieter after doing some spirited driving, it also becomes slightly less responsive. I have the VAP tune and have noticed the condition regardless of if I am running the tune or stock.

I recall Stuart from VAP commenting in a thread that these cars suffer from cat over temp issues which will trigger protection modes. Heat soak issues have also been discussed a few times. One or the combination could be setting off some of the protection modes, causing the quieter exhaust and weakened response after bouts of spirited driving.

I notice my car growls, pops and runs much better when it's cooler out. It's an absolute beast when the temperature is around 50 degrees out.

 

And then the tires don't stick. Damned if you do and damned if you don't.

 

Ain't that the truth! I get pretty good grip with the AWD, but no chance in Trac DSC... it will skip all over if you mash the pedal.

 

I think we're onto something with the o2 sensor update and heat related. It's definitely more common in high heat conditions. I'll check out the o2 sensor threads and call the dealer again tomorrow. Thanks all.

 

ive noticed it as well, and my car has 02 sensor issues as well!!

 

It happens on my car too. Somedays it wants to pop and crackle all day, and others it decides just to chill. After spirited driving the pops and crackles will mellow out as well. I think its normal.

 

Sounds like mine is the o2 update then. Has anyone gotten this fixed? I found some threads from a year ago with this issue. Has anyone contacted JLR?

 

The JTB495 update needs to be applied: https://www.jaguarforums.com/forum/f...7/#post1663695

 

OP and others, did you guys get anywhere with the JTB update?

This is probably far fetched, but my 2017 R seems relatively quiet compared to my previous 2016 R--I question what software I have from the factory--one would think the latest and greatest. My build was 11/16. Perhaps I'll eventually end up with more crackles and pops as my exhaust breaks-in. I only have approx 600 miles. But to me, I think my '17 is much quieter.

 

My appontment with the dealer is not until Tuesday. I'll circle back with the outcome after. Thanks all.

 

my 14S is much quieter after about 30-40 mins of "spirited" driving. i have a service coming up Thursday, will update with the outcome.

 

Update: no resolve. The dealer says my car has the latest software applied and there are no updates too apply.

I was was able to take the tech on a test drive and was able to demonstrate the issue within about 30 seconds.

Very frustrating and not sure how to proceed. Any other insights are much appreciated.

 

Ritzy, I know this Thread is titled in part--"not valve problem," but have you looked at your exhaust valves? Do both your driver and passenger side valves fully open? I'm having an issue with my passenger side not opening completely--not parallel to the exhaust pipe. For reference, this is a cold startup with dynamic mode turned on--2 pics each of each side.

 

good idea. I'll have to confirm myself. The dealer says they have tested the vacuum operation of the valves and confirmed working as normal. I also notice when this issue arrises, it sounds like the valves are open as the exhaust note is much throatier. It's just missing the snap crackle pop bit, but by no means is it in quiet mode.

On the phone with JNA now.

 

And JNA is telling me this is normal operation and to sit and twist.

After a fair amount of argument, I pointed out that every other f Type does not do this. So they finally agreed to open a new tech ticket.

the saga continues.....

 

Just an update for everyone; I tested a MY 2017 R and it did not function the same way mine does. I'm dropping mine back off at the dealer again today. I still suspect this is a result of the k309 update, for whatever reason my cars seems to be heavily affected.

Ive been working with Mike at JNA, he's the only Mike there. If any of you are having issues, I would advise you complain to JNA, ask for Mike if you can. The more people that complain, the more likely we are to get a fix.

Thanks all.

 

How exactly is the pop/crackle accomplished? Sometimes I wish I could have the loud mode but optionally without the pops.

 

Two things happen to make the pop/crackle; first the valves open a piece of straight pipe in the exhaust that bypasses the muffler, second its inducing spark from the spark plugs when an exhaust valve is open to ignite the gasses and send a crack down the tailpipe.