Exhaust valves

[S1jor]

Hi,

My exhaust valves don’t appear to be working on my 2016 v6s.
The light on the exhaust button comes on when it should.
I can move the valves with my hands fairly easily.
Fuse 43 is in and not blown.
The vacuum lines look like there all
Connected
Is it likely the vacuum pump has gone?
Is there a way of testing the pump, or is there anything else I have missed checking??

Thanks

Simon

[scz4]

Hi,

You should be able to moved the valve actuators\mechanisms by hand quite easily to ensure they're not seized. Very close to where the vacuum lines connect.

[S1jor]

Yep I can move them easily, so there not seized

[scz4]

That's good.

Then I'd suggest disconnecting the vacuum hoses (just pull off) and tie wrap a balloon on. See if it blows up when the car is idling\revving, it may even pop depending on the pressure it can generate.

Then you know if the compressors are working or not. If the valves are working, then it has to be that. If I recall correctly, there's a T-piece on the vacuum hose, could just one side be disconnected?

[S1jor]

Hmm, I’d assumed cause its called vacuum pump, they sucked to close the exhaust valves?? Not blew??

[scz4]

Hmm, I’d assumed cause its called vacuum pump, they sucked to close the exhaust valves?? Not blew??

Ah good point.... I'm not sure.

[cj10jeeper]

You may not even have a vacuum pump as there was a bulletin/recall to replace them. Mine was done years ago foc. Thereafter and on later models it just took a feed from the inlet manifold.
…and yes of course it’s a vacuum not a compressor.. if running you’ll hear it high up behind the passenger seat in the corner

[S1jor]

If it’s been replaced, what am
I looking for??,
Would they have taken the vacuum pump away or just disconnected it?? And if that’s happened, vacuum pipes running from the exhaust valves all the way to the inlet manifold??
Sorry for all the questions

[RPSN]

If it’s been replaced, what am
I looking for??,
Would they have taken the vacuum pump away or just disconnected it?? And if that’s happened, vacuum pipes running from the exhaust valves all the way to the inlet manifold??
Sorry for all the questions

Your 2016 V6S doesn’t have the old style active exhaust vacuum pump and reservoir.

Instead, the vacuum pipe runs from the upper rear of the engine compartment, along the fuel lines on the underside of the car, into the rear left wheel arch behind the NVH pad (noise/vibration/harshness), and into the vacuum hose on the active exhaust operating valve.

This link shows the active exhaust vacuum line for the 3.0L and 5.0L cars.... https://parts.jaguarlandroverclassic.co ... nd/jaguar/

I've attached the Jaguar Technical Bulletin dated 03/02/2015 which shows how the vacuum conversion was done on earlier cars. In it, Service Instruction ‘A’ is for the 3.0L V6 and Service Instruction ‘B’ is for the 5.0L V8.

[Fez]

Are you up to date with software updates, if you had them done your valves will not open until 1500 to 2000rpm. I can not remember the numbers but if you search out my previous threads it will explain all.