After its winter hibernation my 1978 XJ12 went to the garage to have its headlights replaced, it drove fine to the garage, then back to my house and then to where i keep the car, 15-20 miles in total, on arriving at my storage the car started running very lumpy, down on power and spitting and banging, we managed to get it into the unit and turned it off, after a while we fired it back up and it was still running rough.
My mechanic looked at it and suggested we replaced the HT leads, we done this and the dizzy cap and rotar arm at the same time, come to start it up and it just won't fire, mechanic came back and discovered the fuel pump wasn't giving out a decent flow so we replaced that and still no go, a new set of plugs and fuel filter also hasn't cured the problem and i think hes running out of ideas.
It is seemingly trying to fire now, its not just turning over anymore but it won't catch, i don't like the stuff but a few squirts of easy start up the air trumpets allows the car to run almost immediately but it quickly dies once thats burnt off.
It has a decent spark at the plugs and plenty of fuel getting to the fuel rail but it just won't catch and run. Does anyone have any suggestions for anything else it could be?
2004 2.1V6 X-Type Saloon in platinum silver for the good wife
1994 3.2S XJ40 in Morocco Red with Doeskin interior
used to have
1999 4ltr Sovereign XJ8 in Seafrost
It doesn't as far as im awaredoes your have the swirl pot in the fuel system , if it does there is a pickup gauze in there before it sends the fuel to the pump and then filter , ( this is how an XJS v12 is setup ) , these pickup gauzes inside the swirl pot is known to get blocked
Back in the day, a Lucas Epitest unit was used to diagnose these sorts of problems. If you can find one, complete with its test procedure instructions, it would provide a logical way of working through all the possible problems. If not, beginning with the fuel system checks above is an alternative way forward. Let us know how you get on. Mike.
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