Good afternoon everyone,
I have this 1996 XJR for 15 years.

I've posted a few months back about my 1996 XJR not being used for 2 years.
when I finally decided to have it started last March, we had difficulty starting it.
Did the proces of elimination.
Changing the:
Plug
gasoline
Oxygen sensor
Fuel pressure regulator
fuel Injector
crank shaft sensor
Please note;
Compression is good
Spark starts strong to weak
But now it won't start.
Is it an electronic issue Computer perhaps?
I will really appreciate your valued opinions and advise.
Kind regards
eddiec
ignition coil

 

@Eddiec

Why did you change all those components? It looks like the shotgun approach to troubleshooting - just replace everything.

Were the components determined to be defective using any pinpoint diagnostics from JTIS?

What are your OBDII codes?

I also note you did not say anything about your battery condition / voltage, what is always job #1.

 

If it's been sitting outside, pull the ECU in the right kick panel and look at the pins closely. I had one corroded and missing that was stuck in the connecting plug. This is assuming you have a good battery.

 

I would check the battery is in good condition first, maybe even use one from another car.
It would be good to know if the key start sequence is working.
Does the engine turn over, just clicking or nothing?
It's worth checking the inertial switch next to the ECU, just push the button in to reset it

 

Thank you very much for all the initial responses.
it will certainly help us rectify the issues.

Will appreciate added opinions.
Thanks again.

 

By placing your finger on the starter solenoid relay ( large right # 4 does it click , do you get starter rotation on the RPM gauge ? Swapped ?

If the relay does not click every time there are security system and shift lever position inhibits to consider later

In the starting sequence the # 1 fuel pump will run for 4 seconds only then turn off by design by rotating the ignition key

The fuel pressure will be held by check valves in both fuel pumps until the Crankshaft position sensor sees engine rotation and turn the pump back on for the duration of your drive

Any 1 of the 2 fuel pump check valves can fail open and ruin your start and a new check valve can be installed in the fuel line like others have done

The # 2 fuel pump will not come on until the crankshaft position sensor sees 4000 rpm

You can jumper the # 1 or # 2 fuel pump relay to run at all times , and both at the same time would overcame a bad check valve in any pump

Someone found one of his injectors hanging open ruining the starting sequence fuel pressure

The Engine ECU has 2 sources of power , The right engine bay fuse box relay ( # 9 )and the large ECU controlled relay ( right # 5 )

These can be swapped with the left engine bay fuse box and the larger headlight , fog and A/ C clutch relay

In the heat of battle the voltage gauge in the car during th starter engagement must stay above 11.4 volt or the starter will spin the engine just fine but the injectors will not pulse

There is a condition you can put your compression into called a bore wash where you have unburnt fuel washing the cylinder walls of lubricant ruining your compression

By starting the engine with your foot all the way to the floor on the pedal it will tell the ECU to not fuel the cylinders and allow oil from the bottom of the piston to lubricate the cylinder walls

The inertia switch does not always reset and can be jumped with a paper clip at the connector between the 2 white wires

There is a separate Camshaft position sensor that is used on the starting sequence only that aids starting with fewer starter rotations ( code PO340 )

With the connector removed the engine will start with a few more rotations then by design or normal

There is a adjustment to it unlike the Crankshaft position sensor which is fixed unless you have the andy bracket on the crankshaft sensor which has special considerations since it biases the signal 5 degrees from the original factory position

You can have the Camshaft sensor adjusted one crankshaft rotation out from the 1/2 camshaft rotation negating the camshaft signal from aiding in the starter sequence regardless as to weither you have the andy bracket or not

 

Have you tried changing fuel?

 

To : Nobeel Masri
Senior Member

I would like to thank you for your valued recommendation.
Will let you know the results.
Kind regards.
Eddiec

 

To: Stag by Triumph,
Thank you for your response. I will let you know the results. Much appreciated.
eddiec

 

Hi Nickhand,
Thank you for your recommendation. Really appreciate.
Will surely look into it.
eddiec

 

Good morning gentlemen,
I'd like to update you with my 1996 Jaguar XJR.
my mechanic just called me and he is really puzzled why the car is acting as reported to the forum.
His recent findings is that the spark intensity goes from strong to weak. Would really appreciate your your input.
kind regards.
Eddiec