Where to fit lambda sensors for easy access

XJ-S
1

Can somebody tell me the best place in the new stainless exhaust down pipes I have to fit the lambda sensors? The body is CKD currently for repair/ repaint. I have to drill out the pipes, and weld in stainless bosses to accommodate the sensors? This is an XJS cabriolet uk spec.Build date 24/4/1987

2

http://www.goflyrc.com/projects/XJS/RtDownPipe.JPG
http://www.goflyrc.com/projects/XJS/RtO2Sens.JPG

Here are pics from my 89, but the best answers is to temporarily fit the pipes and mark accordingly. There is not much room for error.

Bob

3

Advice on someone who just did this and messed up (me), WAIT until the downpipes are installed, then take it to an exhaust place who can do it up on a lift in exactly the best place possible. It’s not just placement, but angle too.

There is not much room for error, as I found out. Ended up capping the holes and will take it in for 2nd try. Car runs fine with no O2 sensors, and just hanging there (I tied them up a bit).

Alternative is extend your O2 sensor wires and just go ahead and have the holes done near the end of the downpipes.

4

Hi Bob
Thanks very much for the pics. And yes you’re right better to decide when engine is back in situ.

5

Hi Greg
Thanks for your very sound advice. You’ve just confirmed my feelings on this! It’s been a very long time since I was under an XJS. I’m not going to try to guess the location of the lambda bosses.

6

Car is at exhaust shop right now. I had chosen the right spot, I just chose the wrong angle.
Definitely wait!

My solution is either buy new downpipes and fit again, or cap holes, weld new ones a bit lower, and splice O2 sensor wires a bit longer so there’s no tension.

They fit them lower, plenty of wire slack. Will post photos tomorrow.

7

Hi Greg
I’ve got new stainless down pipes. I’ll wait until the engine is back in the car. Then appraise the best position for them. Thanks again for your advice.