Hello
I have a 1999 Jaguar XK8
I need help getting it started

No spark
No fuel pressure on the rails

- The crank position sensor has been replaced
- The fuel pump has been replaced 2 times (it does deliver fuel to the rails)
- The fuel filter has been replaced
- The REAR IN TRUNK FUSE BOX (LJB2822DB) has been replaced
- The FRONT FUSE BOX (LJB2822AB) has been replaced
- The timing has been reset
- 120 PSI on all cylinders
No codes are present

What should I do to get this car started?

 

 

Have you checked the inertia switch? Should be on the driver side fuse box, on the side of the dashboard, visible when you open the driver side door wide open. It is meant to trip in an accident and cut the power off to the main module, including fuel pump. I have never messed with it, but I believe it is a simple push to reset it. It is documented in the owner's handbook, and the stickies have links to electronic copies.

Best of luck, keep us posted.

 

First of all, what do you mean by the timing has been 'reset' what exactly have you reset? Then you say that you have no fuel at the rails but the pump does deliver fuel to the rail? not sure what you mean by that? If the pump is running but you have no pressure, the fuel pressure regulator could be stuck open but as you have no spark either then it may be an ECM fault?

 

If you just keep throwing parts at the car it will eventually work??
I know proper diagnostic tools are expensive and taking the car to a qualified mechanic might be expensive, but replacing parts that might or might NOT be bad is expensive ALSO.

The difference between a parts changer and a mechanic is the level of diagnostic ability.

After over 40 years of working on Jaguars I can tell you that sometimes a simple relay or broken wire is all it takes to shut down an entire car.

The problem you find will be the last place you look.

Get out the electrical guide and start finding where the connections are good and where they have failed. It might actually be a faulty ECM but you can eliminate other possibilities with a test light and meter.

bob

 

The inertia switch was checked. It wasn't tripped

 

The timing was set by removing the head covers and the front plate in order to expose the chains...then using the timing kit

 

I really appreciate this post.

For the last few days I have:
- Replaced the ECM & programmed it using IDS
- Replaced the throttle body with a rebuilt unit
- Replaced the engine coolant temperature sensor
- Replaced the spark plugs

Key information that I left out...
The car has been sitting for over 14 months
During this time. The transmission was replaced and all the locks were replaced because I only had the valet key after losing the original key traveling

Yesterday, I changed the fuel in the tank and the starter motor began acting up so that was changed too.

I got the car started but it won't run past 2 minutes... no idle at all.

DTC code is P0121

I'm calling the company that rebuilt the throttle body. Apparently they can't fix this TB, its been sent to them 2 times already.

 

Have you checked this procedure? Would not hurt (or cost) to try...

throttle-body-programming

 

UPDATE....

I've installed another throttle body which passes the throttle body adjustment procedure and the car now constantly starts...

Problem:

The car just won't idle

I'll check for vacuum leaks, the ignition coils, the fuel pressure and the spark plugs

The only codes I can get from the car are P1316, P0300

Feel free to add more suggestions

Cheers

 

Miles? Plugs due or not?

Often those codes are a coil if not but any air leak and expect grief so follow threads about trims.

 

Sounds like a fuel pump problem. Can you check the fuel pressure ?

 

Can you hear the fuel pump being controlled on for 3 - 5 seconds by the key in the on position before start position ? The pump comes back on after the ECU sees engine rotation by way of the Crankshaft Position Sensor .

Does the Tach show RPM's as you turn engine over ?