Help required - XK8 will not start. No power at the coils.

[scoobiefan]

Hello folks,

I really do need some help, please. My XK8 won't fire or start. I have replaced the fuel filter, I have good fuel pressure at the Schrader valve. The fuel pump relay is live and switching correctly. 

However, there is no power at the coils at all. Is this something that has occurred for anyone before?

I'm wondering if the immobiliser is causing this issue. For some reason, the central locking isn't working, but I can set the alarm with the fob.

Any advice and assistance is greatly appreciated.

Thanks.

[Jimbov8]

2 fuses to check first. Fuse F18 10A and fuse F14 10A, both in the engine management fuse box.

[scoobiefan]

18 hours ago, Jimbov8 said:

2 fuses to check first. Fuse F18 10A and fuse F14 10A, both in the engine management fuse box.

Thank you for responding. I have already checked these Jim, and they are fine. I think we have exchanged messages on Jaguar Forum as well?

[Jimbov8]

Ah, ok. When you try to start is the PATS light flashing.

[wardy123]

On 7/13/2023 at 2:58 PM, scoobiefan said:

Thank you for responding. I have already checked these Jim, and they are fine. I think we have exchanged messages on Jaguar Forum as well?

What was the issue ?? As I have no spark

[LairdScooby]

11 minutes ago, wardy123 said:

What was the issue ?? As I have no spark

Have you checked the CPS (Crank Position Sensor)? They have a habit of going with no warning, no spark and Jaguar want a small fortune for them. However you can get them on ebay for ~£15, i did for my S Type 3.0 which uses the same as most petrol V8s/V6s, the Ford Thunderbird and Lincoln LS of similar years.

They're a bit of a faff to change but a relatively cheap and easy fix, best approached from underneath so a good jack and axle stands are needed.

[wardy123]

2 hours ago, LairdScooby said:

Have you checked the CPS (Crank Position Sensor)? They have a habit of going with no warning, no spark and Jaguar want a small fortune for them. However you can get them on ebay for ~£15, i did for my S Type 3.0 which uses the same as most petrol V8s/V6s, the Ford Thunderbird and Lincoln LS of similar years.

They're a bit of a faff to change but a relatively cheap and easy fix, best approached from underneath so a good jack and axle stands are needed.

 

[scoobiefan]

Wardy,

I found it was the relay in the engine fuse box that wasn't properly pushed in. It fired up straight away after I did this!

Tim