Hi fellow XK'ers.

Beautiful Jaguar that runs well 90% of the time. Every now and then, the engine runs rough, normally in traffic, and the eml comes on. Sorts itself out after a while and runs ok again for a bit.

Looked at codes and saw these. Is it worth just changing the fuel pressure sensor?

Additional info. Changed the cats a couple of years ago, no issues so far but could this be related?

And, when starting, I've noticed just a very slight delay in firing. Could this be a battery issue and, if so, would a low battery play with these sensors readings?

Any advice would be much appreciated
Thank you.

 

Jackson, I have noticed a delay in firing up on my 07. Personally I believe that the programming does this. That once the car reaches a certain RPM, I believe to be 1500, the ECM sends the juice to the spark plugs. It is more pronounced in very cold weather. Often in the cold, you can hear a piston or two fire up at a low RPM. But not in the Jag. It wants its 1500 RPM first. In aviation we would turn on the magnetos after we had 9 blades of the prop, pass by the cockpit window.

 

I had that P0193 code in my old 2005 STR and yes it was the fuel pressure regulator.
Can you measure the fuel pressure?

The plugs fire immediately. Nothing to do with RPM. You can check this yourself very easily.
.
.
.

 

The two codes together point to the fuel pressure sensor. After that, possible wiring damage so when you are there, use some contact cleaner on the electrical connections associated with the sensor system.

 

I'd try a can of Berryman B-12 Chemtool in the gas tank first. One of the best fuel treatments in the market, IMHO. All my cars get pretty regular treatment with the stuff. Just fixed my caddy p codes this past week.