Hi all,
Half a year ago, I found a 39000 miles XJS year `1988 in a abandoned in a storage for $3000, with no rust, beautiful paint and great internal leather. I took it to a local garage that works on jaguars. The elderly mechanic worked on it for half a year and finally it got on the road. It worked for a few days, although it did make a minor knocking sound when idling. One would not hear it going faster than 30 mi.

Then it started holding back a bit and a few times it backfired. Afther 15 minutes the engine stopped while slowing down at a crossing. I got it running again with the ignition. As I continued driving it got worse, halting more often backfiring increasingly more often. I just barely made it home. This morning I hoped I could get it to the garage when cold, but it did not do more than 400 yards and then it would not even start anymore.

So far I spent $9000 on getting it fixed, with many hoses replaced, new fuelpump, tank drained twice, all liquids flushed and replaced, sparks new, battery new, brakes new, new sets summer (daiton rims) + winter tires (regular rims), exhaust repaired, bottom rust treated, engine all shiningly polished. In short, the car looks fabulous. Only a "minor" problem, the engine does now run...........

 

I don't have the V - 12 but I think you have 2 crankshaft position sensors

See page 267

jagrepair.com/images/Training Guides/801S - 2000.pdf


The one on the rear I beleive is plugged in the engine block in a oil bath that can get metal partials attached to the face of the sensor

Cheap try

You can command the fuel pumps to stay on by jumpiring between socket 3 ( power ) and 5 ( to pump ) , The # 1 and # 2 fuel pumpis controlled by the crankshaft position sensor ( which one ? )

Recommend medium gauge wire with blade type wire ends , the auto parts store can make one from a kit box behind the cash register

By jumper Ing the fuel pump relay it will drain the battery with the keys in your pocket

 

You'll have more participation on this on the XJS forum. This one is for 95-96 xj12 saloons

 

There are 2 different 6.0 liter engine regulation ECUs

I don't know the crossover VIN #

So you would have to determine your and advisors type

last 2 years Denso and earlier Lucus / M ( ? )

Others have gone into and repaired the Denso ECU from reading others

 

Hi all, Thanks for all the great feedback. My mechanic found a new fuel pump. Cleaned out the gas line and the car runs again like before. He said the car was not getting enough fuel. Thanks again for all the advice.

 

Hey Oliver, if not mistaken, you own a XJ12. I am looking all over the injection wiring harness and cannot find it. By any chance would you have a place that a could look for ? Thx.

 

Hey, how are you. Since I see you have a V12, I am looking all over to find (even used ones) the injection wiring harness for my 1996 XJ12. They are completely cracked. Any pointers ? Thx.

 

Robert Knodt specializes in xjs 12's and has a v useful youtube channel. I believe he has some medical issues but you might try contacting him.

 

Thank you so much for the hint