Took me 20 min on an XJR, but the supercharger belt had to come off and get retensioned after the sensor was replaced.

 

I had no idea myself that you could get the crank sensor out from the top so that is good info to learn. I also may have mislead you by saying the magnets get weak over time which I could see why you were wondering what to do when the CPS picked up the socket with it's magnet. My thought is the magnet or whatever it is that picks up the signal from the crank pulley fails over time so sorry if I mis spoke about the magnet getting weak as if to imply the magnet would no longer pick up a metal object.

I do know that there are just a few things that will normally cause the AJ16 to not start after starting fine the time before as has already been stated in a prior post. That is not to say there can be more things to cause the idle to drop off after starting or a hard start issue. Like I stated in my earlier post if the CPS has not been replaced as long as you have owned the car it is a quick and fairly inexpensive item to replace as a starting point.

I really hope the CPS is your problem but if that does not correct the no start issue we will all work together to help you get it figured out.

 

Hi LuvmyXJS

Yeah, it did kind of throw me a bit, when you said that the Magnets get weak over time and yet here it was with still enough of a Magnetic Field to not only pick up but also hold onto a very heavy spanner, without even being plugged in!

Where no doubt the Magnetic Field would have been even stronger, than it was in my Static Test

From which I then understandably concluded that the 'Crank Position Sensor' must have been ok and as such was not the cause of the 'No Start Problem'

Unless that is, it happens to be more than just a somewhat glorified electronic magnet, about which I have really no idea!

Although despite my circumspection that it wasn't the CPS, it seemed that everyone but me was carrying a 'spare one' in the glove box

Where that alone convinced me that perhaps I could be wrong, so there was only one way to find out and to that end I've ordered up a New CPS, which has been dispatched and on the way

Doing that job from under the Car almost had me slitting my wrists, as it took me all day long to remove that single bolt that holds in place the 'Crank Position Sensor'

Where in total contrast Katar's way of doing it from underneath the Bonnet/Hood took me all of less than 60 Seconds!

But I've said it before and I'll say it again, it's really just one of those things, as I've been a Forum Member long enough to know, that everyone is only here to help

And as I always say 'You can't learn less'

 

Hi Leo

Have you got a link to the XJS Club Site, there seems to be more that one Club and so I don't know which one has that PDF Manual

 

Hi Guys

New 'Crank Position Sensor' just turned up!

And it looks exactly the same as the one that I've taken off, so now I've got to swap the mounting bracket after a little bit of a clean and paint

Then after fitting this New 'CPS' in Carmen, we will see if She Starts of if not then we'll know it's something else, only problem being that the Weather could be better, as now and again it is chucking it down with rain

So if not today then tomorrow (hoping for today though obvs)

And let's hope putting it back will be a bit quicker, although regardless of what happens I will be doing a write up on my 'Cherry Blossom' restoration thread as soon as its done

'Cherry Blossom' restoration thread



New 'Crank Position Sensor' Let's hope that this does the trick

 

 

What state is the battery in? These car are sensitive to battery voltage, if the battery is old or weak it won't run properly.

 

Hi Jagboi

The Battery is about 2 years old and in regular use on my Merc and I also gave it an all day Charge before I put it on the Jag, where I am pleased to say it really 'zonked' it over

And although She's continually firing as She spins over, the Engine just won't pick up and run on her own and I've also had the battery on Charge overnight, to have another try with her today

This Battery easily Starts my V12 but even my Lawn Mower Battery Starts my V12!

 

Have you got fuel and spark in all cylinders?

 

Hi Daim

That's a very good question!

Maybe I should take out all of the Injectors and give them a Clean

 

www.xjsclub.org costs a tenner to join. alternatively pm me an email address and ill send it as ive just downloaded it. i dont know how good it is but its 73 pages long

 

Hi Leo

Cheers! but how much is the download?

 

costs a tenner to join the club. the download was free. Off to Lavenham for the car show today. Taking the jag and hopefully avoiding the rain as im going "lid off"

 

Have a nice day Leo, what did you think of the download?

 

Spark is easier to check... Check that first.

 

i didnt really look at it, i just downloaded it. Wisely didnt take the jag to lavenham, got soaked, it pissed down

 

XJS 4.0L 6cyl won't start

CPS 'Crank Position Sensor' replaced with a New one

Here is a Short Video so you can hear what she sounds like, any ideas as to what to try next

No experience of working on these 4.0L engines, so open to any suggestions of what to try next

 

OB
That sounds to me like a fuel problem. She is trying to start occasionally, I think. Pull a plug or two and see if they are wet. If not, and you have fuel pressure. get the GF to turn her over and listen for injector clicking, even better, is it possible on an AJ16 to pull an injector, or some injectors as a group, and see if it/they sprays into a jar when the engine is cranked?
Greg

 

Hi Greg

Cheers!

It also sounds like a Fuel Problem to me

Each one of those Spark Plugs has a Separate Coil on top of it

As for the Injectors, getting those out looks quite complicated so no real idea where to start

Maybe I'll try the Plugs first but they don't look too easy to get to, as they are at the bottom of what looks like a 6in deep hole

 

I can't remember if the inertia emergenncy fuel cutoff switch was checked, on the passenger side? There's a button to press.