I had a P0444 code on my OBD and the check engine light was present in my 97 XK8. I changed the purge valve with a genuine Jaguar part and I noticed an immediate improvement in how the engine felt when driving. (and the check engine light went out as an added bonus!)

However, there is a noticeable semi high pitched "hum" at idle and an increase in rpm's makes it go away, yet at idle the hum returns. The sound seems to be coming from the intake manifolds yet the new purge valve when touched, is vibrating like crazy. The valve is mounted to the chassis with two rubber shock absorbing mounts similar to the design of an engine mount, and when touching the valve the hum dissipates slightly so I'm not too sure if this is normal and the valve needs time to "break in" or if I may have a faulty valve.

I did some researching and I've seen a TSB from Jaguar about a "ticking" purge valve , but nothing addressing a hum. I may try and tighten the 10mm nuts on the mounting bolts to see if this helps, but for the time being, has anyone else had an experience with this? Thank you in advance.....

 

I tightened up the 10mm nuts that hold the valve in place and that seems to have cured the case of the vibration shakes that the valve had earlier. The high pitched hum is still present....not too sure what to make of that right now...

 

The valve seems to be settling in after a few days of driving as its a lot quieter now.

 

I replaced mine as well a couple of months ago and also had that humming noise. I put a cardboard pad between the can and the bracket and it has not hummed since. I should have put a piece of noise reduction pad there instead. But, it is good for now. That canister vibrates at a fairly high frequency and if it is not isolated properly it can make that humming noise.

 

Anyone have the part number for the purge valve??

I also have code P0444 Evap control valve open... I assume this means a faulty purge valve.... anyone have any thoughts..

 

LJG1515BB
Purge Control Valve
$80.40 at Elder Auto Group

Driver side wheel well, between the tire and door. You have to remove the wheel well shield. Easy fix.

Verify it is the part for your car

 

that appears to be the part number for the 03 to 06 xk8... I need one for my 1998 xk8. I should have mentioned that sorry.