1994 4ltr Petrol Jaguar Xj6

[Roo1st]

Hi I have a 1994 4ltr Petrol Jaguar Xj6 x300 which wont start it turns over but wont fire. The 'check Engine' warning light is showing.
The initial fault was the rear rhs door lock was jammed open , ie so door could be closed but not locked but the alarm and central locking etc were working ok. I removed the door lock and sprayed copious amounts of wd40 in the lock finally the lock is now free and working, however I now have the problem of the car not starting.
I read previously somewhere that the micro-switch in the lock might prevent the car from working due to immobilizer thinking the car is being stolen..
the switch sounds like it is working but could be gummed up with wd40...
Unfortunately when i removed the lock i didnt disconnect the battery could this have caused a fault .
For the 'check engine light' i have recharged the battery, disconnected and reconnected the battery, left the negative disconnected for 15 mins, tapped the 2 battery cables together (not when connected to the battery) to reset the immobilizer .

Basically there is no petrol going to the engine..as cant smell any getting through (fuel tank 1/2 full). The fuel tank has 7v going to it , checked at fuel tank sender.

My local garage doesn't have the management gadget nor do I is it possible to buy one where and what price are they if required..

I would appreciate your thoughts thank you

[Roo1st]

Thank you for your reply.... the rev counter flickers and reaches 2rpm on cranking, when turning over.

[Roo1st]

Thank you steve..

[Roo1st]

Thank you for replies...... I started looking for the fuel pump... but couldnt find it and so decided to try the engine again ... low and behold it started first time. kept it running for 20 mins turned it off and returned to fixing the door lock and sunroof... Tried to start the engine again dead... even with new battery it wont start... looking for fuel pump still.

[Roo1st]

sorry but can you tell me what i should be looking for i found a metal box on the passenger side footwell but no switch.

[Roo1st]

Jim Thank you very much for your pointers i will have another hunt later haha

[Roo1st]

Thank you Jim I found the switch I think haha..... it was up just above the the accelerator pedal, with black rubber cover
However unfortunately even after pressing it there was no change the engine failed to start and no petrol.

[Roo1st]

Does anyone know which obd2 code reader works for this 1994 x300

[Roo1st]

Story so far as of going to press on 1 August 2016....hahaha

Well after it started last I fitted the door lock and it wouldnt start...

So i went through all the checks again, fuses, exchanging various relays that i thought were the right ones for fuel pump etc, resetting the, immobiliser , the fuel pump switch , the door lock, the sunroof switch (which i connected before it died again.) I did everything possible , even put a new can of 'FRESH' petrol.. no joy....
decided to call out the 'AA' well break down service hoping he have diagnostic tool but car too old . 1994...
After listening to all my shenanigans, all he did was unclip one of the air breather hoses on the air in take and squirt 'easy start' down it while i turned the engine over and pumped the throttle... hey presto... it started perfectly ... and kept going till turned the engine off.. thus proving the problem lies in a relay somewhere that is required to push fuel through the engine on initial start up...

So if you are in deep sh.... trouble engine turns over no petrol getting through system ... remove air hose (small hose) off top of air intake before actually gets into engine and squirt 'easy start' down there that might just get you going until you turn the engine off...

still to find which relay it is ... as i swapped over the ones i thought it was with others but still not work.

[Roo1st]

yes J.... 'the messenger of woe' luckily we do not shoot the 'messenger' hahaha .... i replaced all the relays with a new one independently, ie one at a time... even the blue ones sadly the car didnt fire... I tried the easy start method and the car started and kept going so as you say it must be the ecu however i dont have proper wiring diagram as yet to check. or proper manual as manual was for the wrong car.. typical haha

Thanks anyway J

[Roo1st]

Thank you J I have just emailed him... thanks for your help

[Roo1st]

Just to fill you in I actually bought a draper code reader from Clifford's. Brighton, which actually worked and gave me some codes..... P0123. Which is Throttle pedal position sensor A circuit high input.
P1177 long term fuel trim, too rich banks 1 and 2 I did some research on Internet and also independent jag specialist in anmering who said it could be petrol pump lack of pressure.....

Anyone ideas guys on these codes haha

[Roo1st]

The Ecu gentleman said this type was too old for him to work on
I have since bought a Draper OBD2 test unit from cliffords in Hove, which came up with code P0123 throttle position sensor
P1177 rich fueling. From what I have read, that could be a faulty fuel pressure regulator, clogged return line, bad injectors or basically faulty fuel pump.

Does anybody have anymore info or even idea where the fuel pump is... i thought it was on the back of the fuel tank in the boot,,, but after reading other posts regarding fuel pumps on x types i may be wrong as mine is 1994 and ones in question are 2001 +

Thank you

[Roo1st]

J. I do really appreciate your continued help thank you .... no problem i will wait haha

[Roo1st]

Well just to conclude more than a year later .. as I have been busy on other projects and didnt have time to work on the Jag, I want to inform you of my findings , after changing various relays and fuses as pointed out in the forum and elsewhere i finally changed the mass airflow meter as this seemed the next step, this didnt work so i changed the crankcase sender.. this too didnt work.. Finally i gave up and sent it a garage .. the problem was WATER in the fuel !!!!!!... He rigged up a secondary tank filled with new fuel and connected using the fuel pump .. and everything work ok..

[Roo1st]

Thank you very Much Mark.. happy motoring

[Roo1st]

Hahaha yes Mark as you said who'd have guessed it was just contaminated petrol after all it 'purred' once it started via the 'easy start' spray haha.. at least its going now haha thanks again. bye