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Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 15544
Experience:  12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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2013 jaguar xj supercharged 3.0 running rough sending smoke

Customer Question

2013 jaguar xj supercharged 3.0 running rough sending white smoke thru left exhaust. Reading says 4,5,6 injectors misfire gas smell at tailpipe.Codes say P0087 fuel rail pressure low and P00C6 fuel rail pressure too low engine cranking
Submitted: 11 months ago.
Category: Jaguar
Customer: replied 11 months ago.
Vehicle never raced driven reasonably
Customer: replied 11 months ago.
51000 miles in Florida no cold weather
Expert:  Richard replied 11 months ago.

Sounds like we may have injectors leaking. This will cause your issue. The injectors will most likely need to be replaced. I have also run into a couple of oxygen sensor issues but usually those codes point to leaking injectors.

Customer: replied 11 months ago.
There are also other indicators with the codes as followsHigh speed regulator 1 exceeded learning limits too highHigh speed CAN communication BUS. Code U0001.
What do these mean? Are they sensors or controllers that might cause these symptoms? injectors are $432.00 each
Expert:  Richard replied 11 months ago.

Ok do you have the code number for the High speed regulator 1 exceeded learning limits too high fault?

Customer: replied 11 months ago.
No fault number indicated. I can send you an image of the readout via text or email for a look.
Customer: replied 10 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Richard replied 10 months ago.

Another possibility is an issue with the high pressure fuel pump timing. A special tool is used to check the timing. The vacuum pump is removed and with the crank at a certain spot the tool fits into th fuel pump cam.