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I got the FPS replaced, but it didn't really change the way the engine is running rough. Still, I think it was good to replace it, and was a repair I could do with my son. It ran well for a day and a half, then went back into this chugging and restricted performance. I guess that's the very definition of intermittent.
Yes the fuel pressure sensor is removable and we found out later that it is also a fuel temperature sensor. That's not documented very well in the manuals.
This is off my 2014 XJR. Which should be the same as your car.
The electrical connection is just a standard push tab to release connector. They are difficult sometimes and of course the lovely position it's in on the engine makes it darn near impossible to get at! As my picture shows removing the passenger side fuel rail makes it simple. But that's a LOT of work if the only thing your doing is replacing the sensor!
This is something I have experienced on my 4.2 SC, does it smell of petrol/gas when you first start it? After a few minutes does it settle down and idle normally? will it run normally when driving lightly not going full send etc? if so the it could be a leak on the fuel rail, it need to keep pressure at around 56psi. One thing that can leak on the rail is the fuel dampers as the ethonol in the fuel eats the seals, you can get replacements in the USA from injector planet they are ford items $49 each in the USA or pay jag £172 each or £1400 per side for new rails, its probably easier on the none SC model to replace. Mine got to have the SC out which is a big job. I got an inspection camera to check mine out for leaks as it means you can check the injector seals for leaks etc, check fuel pump is delivering enough. One other area to start is a product called Profi Fuel Max, in a carb cleaner / fuel stabilizer and helps dissolve enamel just in case of a build up or something but as all 8 have missed (seen on mine) I would look at fuel and ignition
I purchased Injector Planet units, with the black oring on the fuel rail side. I found that the black rings shrank over 24 months, causing a fuel leak around the oring. The viton rings did not shrink at all. The units otherwise worked fine.
Congratulations on finding and replacing the problem fuel injectors.
And thank you for posting your solution.
Please accept my apology for the aggressive tone of comment. #12.
