My dad has a 1996 XJ6 and for months it's been stalling at idle. It doesnt happen all the time but it's annoying. It has 8 codes:

p0727
p0400
p1775
p0411
p0401
p0400
p1315.

Other people with this issue have said to replace the crank sensor but I did that twice. The most recent was today I went to the junkyard...looks like it was almost new. The metal parts were nice and gold colored still.

I also picked up a cam sensor but didn't try that. My dad had me try bosh (sp?) platinum spark plugs about a month ago. None of this worked.

About a year ago we replaced the EGR valve. I noticed some of these codes relate to that. I just got a new gasket because I noticed it looked bad. No luck there.

My dad does insist on using regular gas. I use premium when I drive it and in my own car.

Any thoughts?

 

Have you looked into the IACV (idle air control valve)? On my XJ6 when I first got it, mine was faulty and would also stall sometimes at idle. I eventually swapped it with a whole throttle body assembly which came with the throttle position sensor and IACV since they are mated with eachother (as far as I know...?) and haven't had the idle stalling issue ever since.

 

How would I test it first?

 

Honestly, I'm not sure how to test them...
If there is a way then I'm sure someone would chime in.