I am looking for the location of the knock sensor and was told it was under the plastic trim between the valve cover and the intake. All I found there was vent tube. This is on a 2002 XJ8.

 

They are under the intake manifold, one for each cylinder bank.

They are relatively easy to get to, just remove the plastic "Jaguar 4.0" engine covers and with a flashlight peer down between the intake plenum. They are each bolted to the block with a single nut, and the electrical wires connect on either side of the thermostat housing.

They used to be available for around $30 bucks, but of late it is hard to find them for less than $90.00 Try Auto Zone or Rock Auto

THIS IS WHERE THEY ARE, BUT OF COURSE YOU DON'T HAVE TO REMOVE THE PLENUM TO GET TO THEM


THEY CAN BE SEEN AND ACCESSED WITH THE INTAKE PLENUM.IN PLACE...........


THE ELECTRICAL CONNECTOR LOCATION.............................


WHAT THEY LOOK LIKE............................


PART NUMBER.......................................

 

Thanks, I will check it tonight. it is an intermittent problem.

 

Here's a pdf, pgs 100-101... http://www.jagrepair.com/images/Trai...ual-9-5-01.pdf

But you need to make sure of which one you need first. Some screw onto an assembly (like in the pdf), some have a threaded post up through and a nut to hold them down (like the one CK is showing). Also be absolutely sure you properly torque them.

 

Good point HH, the early AJ26s were the screw type, Ronaldp's is a 2002 AJ27 so his should be the threaded post type.

.

 

I forgot he had the '02 when I was looking up that pdf, ty....on mine I replaced them with the '04 4.2L ones from NAPA, got them for $62 ea. and they work the same. Mine is a SC though.
Here's an old thread from Jim Lombardi where he details his replacement and it gets into alternate ones to use later in the thread... https://www.jaguarforums.com/forum/x...t-1-2-a-76815/

 

Yes, and in that older thread of Jim Lombardi's the W0133-1655837 sensor he purchased for $27.95 is now $135.95 from the same supplier!

I replaced one of mine a year or so ago for $30, and thankfully bought a spare one...............it's really hard/impossible to find them at sensible prices now.

The cheapest I have seen lately has been $85, no tax, free shipping. The item is listed for a Jag V6 but they are the same sensor. https://www.ebay.com/itm/Ignition-Kn...frcectupt=true

The options are....... (all of these work fine for the later AJ27s)

1) Duralast SU7012
2) Airtex 5S5619
3) Standard Motor Products KS309
4) Denso LNE1692AA

 

Thanks for all the information. I found it and pulled it off last night. Now to find it at a reasonable price.

 

Does anyone have the torque setting for the post mounted Knock sensor?

 

I read 20Nm or 14 lb/ft on one of the other forum posts.
https://www.jaguarforums.com/forum/x...ine-faq-45963/