My Engine suddenly stopped while driving last week. I called the AA and the mechanic thought that I had put in diesil fuel as I had filled up 15 minutes before. I emptied the fuel and filled up with unleaded and no joy. I have a marelli digital ignition system. I have renewed The two Sensors,two coils,ignition leads,distributer cap,rotor-arm,spark plugs. I have a new fuel pump and filter and they are working ok. The car was running perfectly until this happened. Is there a way to find out if the Injectors are working as they have not been renewed. Is there a Relay or Fuse that would cause the Engine to stop dead??
I am at a loss as the nearest Jaguar Garage to me is 30 miles. The AA said they would drop the car off for me but I declined as you know what Jaguar could charge. What tests can I try Now??

 

i know you said you replaced all these parts but did you check for spark, fuel pressure, and injector pulse?

also, try replacing the coolant temperature sensor.

 

Instead of just replacing parts lets find out what is missing. You need to know if you have spark and fuel.

 

why not bridge the coolant sensor and see if it will start. Lols will be had if it does.

 

Mmmmm, on the 2 Marelli beast I contact from time to time, one had the same.

Look (hahaha) down the front of the engine, sorta below the oil filler cap, and you will see a small wire loom with a plug connector/joiner. Unplug it, clean the contacts, and see what gives. It is the front crank sensor loom, and that dumb thing killed one car twice, the first time was a challenge to locate the cause, the second was simple obviously.

I cannot see the relation to filling with fuel, but who knows.

 

I bought a new Coolant temp sensor and installed it yesterday. I also checked both the Flywheel and Crankshaft Sensors (new 1 month ago) and got a reading of approx 660 ohms each. She is turning file and giving a spark but just not firing. I used the fuel pump to empty the fuel into cans and the pump seems to be working fine. I emptied 30 litres of fuel pretty quickly. The pump and filter are only three months old. Maybe it is a problem with the Injectors? I gave up yesterday. I have had enough for a day or two. It is diffucult to get hold of an auto engineer who knows anything about the xjs, even at the Jaguar Garage.

 

If you have spark then you are missing fuel. Next step is to see if you have injector pulse. Either buy a noid light, use an LED test light or connect a scope.

Remember just because a part is new does not mean it is good. If you have access to a scope you can check the crank sensors.

 

i always check for pulse with a mechanics stethescope.

 

i have a 94 xj6 tht wont start i have no pulse at the injectors i was told to get a new ecm i did car still wont fire. help please mising my jaggy

 

OK, you are fairly NEW, so welcome.

Your "94 XJ6 is known as an XJ40, so I would strongly suggest reposting this in the XJ40 area, so you get the best, most accurate assistance for your specific car. The XJ-S V12 is very different.

 

Just out of left field there is an inertia switch on the drivers A pillar just under the edge of the dash these can give problems and will kill the car.

1. make sure the button in not UP (don't ask how I know this one)
2. if it is on jumper out the switch.