How to change a Knock Sensor on a Jaguar AJ27 Engine FAQ
Senior Member
Joined: Nov 2011
Posts: 293
Likes: 28
From: Playa del Carmen
I have had it happen at both Valero and Citgo.
Since I live in Texas there is no consumer protection. The gas station will blame it on the truck company and the truck company will blame it on the refiner and on and on.
They caught one chain here and figured they stole millions so the gave them a fine that was a pitance of what they stole.
It can happen at any station so always be wary if you start getting poor performance or codes about 10 miles after a fill up.
Cheers
Since I live in Texas there is no consumer protection. The gas station will blame it on the truck company and the truck company will blame it on the refiner and on and on.
They caught one chain here and figured they stole millions so the gave them a fine that was a pitance of what they stole.
It can happen at any station so always be wary if you start getting poor performance or codes about 10 miles after a fill up.
Cheers
Still on the upside, they always offer to sell octane booster additives when you fill up.
Junior Member
Joined: Jan 2009
Posts: 17
Likes: 1
From: missouri
Pictures not showing
Hi davidN,
Could you re post the pics for this DIY or sent them to me? They are not showing on any browsers. I tried IE, Chrom, firefox, safari.
I want to see the location of the knock sensor for my 2000 xj8
Thanks,
Could you re post the pics for this DIY or sent them to me? They are not showing on any browsers. I tried IE, Chrom, firefox, safari.
I want to see the location of the knock sensor for my 2000 xj8
Thanks,
Senior Member
Joined: Mar 2011
Posts: 473
Likes: 17
From: Tucson
Follow the wire back from the attached clip on the thermostat housing, about midway between the intake manifold and cam cover you'll see where that wire ends with a torx bolt showing. Thats it.
Junior Member
Joined: Jan 2009
Posts: 17
Likes: 1
From: missouri
Question on the cheaper knock sensor used in this write up
Just to clarify, the cheaper knock sensor used in this write up is a OE knock sensor for a 2005 jaguar xj8 4.2 liter v8 and the plug is the same other than longer wiring correct.
For those of you that did install this alternate knock sensor. Can I get an update on any problems or its performance?
Thanks you
For those of you that did install this alternate knock sensor. Can I get an update on any problems or its performance?
Thanks you
Veteran member
Joined: Mar 2007
Posts: 11,344
Likes: 1,164
From: Oak Ridge, TN
David, your pics in the 2010 original post have vanished, any chance you still have them and can repost? If you need a hosting location, email me with the pics and I'll get you the link to where they're stored on our mediafire ftp area. Didn't see any contact method for you in your profile, else I would have PMd ya. 
Veteran Member
Joined: Aug 2010
Posts: 2,636
Likes: 1,636
From: Southington CT
Hi
I copied one of the photo image website addresses and was able to get on DavidN website (Frankfurt, Germany). David's website (Water Skiing) has a Photo of David.
I sent David an email from his website, asking him to see if he can repost the photos of the knock sensors for this DIY thread.
Jim Lombardi
I copied one of the photo image website addresses and was able to get on DavidN website (Frankfurt, Germany). David's website (Water Skiing) has a Photo of David.
I sent David an email from his website, asking him to see if he can repost the photos of the knock sensors for this DIY thread.
Jim Lombardi
Last edited by jimlombardi; Jun 30, 2012 at 06:54 AM.
Veteran Member
Joined: Aug 2010
Posts: 2,636
Likes: 1,636
From: Southington CT
Hi
Here is update on the missing photos.
DavidN emailed me all of the photos and I uploaded them to my mediafire.com account.
Forum moderator - translator will be fixing the missing photo issue in post# 1 and post# 2.
Jim Lombardi
Here is update on the missing photos.
DavidN emailed me all of the photos and I uploaded them to my mediafire.com account.
Forum moderator - translator will be fixing the missing photo issue in post# 1 and post# 2.
Jim Lombardi
Last edited by jimlombardi; Jul 3, 2012 at 11:29 AM.
Veteran Member
Joined: Aug 2010
Posts: 2,636
Likes: 1,636
From: Southington CT
Hi
I created a Knock Sensor DIY PDF (16 page) file from DavidN post# 1 and post# 2 and also included Knock Sensor location information from the JTIS21 shop repair manual.
Here is the weblink to the PDF on my mediafire account:
Free Cloud Storage - MediaFire
Jim Lombardi
I created a Knock Sensor DIY PDF (16 page) file from DavidN post# 1 and post# 2 and also included Knock Sensor location information from the JTIS21 shop repair manual.
Here is the weblink to the PDF on my mediafire account:
Free Cloud Storage - MediaFire
Jim Lombardi
Last edited by jimlombardi; Jul 15, 2012 at 01:14 PM.
Junior Member
Joined: Mar 2013
Posts: 1
Likes: 0
From: Atlanta
Would this be the same for a 2007 XJ8?
I own a 2007 XJ8 woth 90K miles. I hear the knocking/gurgling noise during acceleration from stop. I have determined that the knock sensors are at fault. Would the posted photos and instructions be the same for the 2007?
Any help would be greatly appreciated.
Other than this issue the car is a dream to drive.
Thank you again!!!!
Any help would be greatly appreciated.
Other than this issue the car is a dream to drive.
Thank you again!!!!
Veteran Member
Joined: Mar 2012
Posts: 1,531
Likes: 204
From: Florida
Hi
I created a Knock Sensor DIY PDF (16 page) file from DavidN post# 1 and post# 2 and also included Knock Sensor location information from the JTIS21 shop repair manual.
Here is the weblink to the PDF on my mediafire account:
Free Cloud Storage - MediaFire
Jim Lombardi
I created a Knock Sensor DIY PDF (16 page) file from DavidN post# 1 and post# 2 and also included Knock Sensor location information from the JTIS21 shop repair manual.
Here is the weblink to the PDF on my mediafire account:
Free Cloud Storage - MediaFire
Jim Lombardi
Junior Member
Joined: Oct 2014
Posts: 2
Likes: 0
From: Augusta, WV
Still experiencing restricted performance issues
After changing a knock sensor on my 1999 VDP (I had used a code reader to determine the problem w/a "restricted performance" message), I am still having the issue and my code reader is identifying the knock sensor as the problem. My question: Did I screw up by using a magnetic pick-up tool to position the sensor on the stud on top of the engine? Is the sensor that sensitive?
Veteran Member
Joined: Aug 2010
Posts: 2,636
Likes: 1,636
From: Southington CT
Tim
Use this weblink to PDF file (on my dropbox.com account) that has the photos in it (pages 3 thru 16):
http://www.mediafire.com/view/?oss71axa467vsj6
Jim Lombardi
Use this weblink to PDF file (on my dropbox.com account) that has the photos in it (pages 3 thru 16):
http://www.mediafire.com/view/?oss71axa467vsj6
Jim Lombardi
