I'm getting a temporary misfire on most journeys now when under load pulling away after a motorway style journey. Tends to happen after a good journey then stop and sit in traffic, then is "lumpy" on pulling away. No notifications on the dash and behaves normally and cleared if I change down a gear manually. Diagnostics show Mass Air Flow, Low Fuel Rail Pressure, Fuel Pump circuit issues but all these including the accelerator potentiometer are all reading -30 which is normal according to the garage. Any guidance appreciated as had 2 Jaguar "dealer/specialists" look at it and no issues found that they could trace?

Any help appreciated.

 

So many possibilities...... bad gas, dirty MAFs, injectors failing (maybe), and could also be something like a minor vacuum leak. Is your fuel cap securely installed?

 

It's been steadily getting worse over the last 6 months. It's now pretty much every journey of the same style. Fuel cap is secure. Currently checking the wiring.

 

Hope you get to the bottom of it

 

I recommend taking this issue seriously, if you end up in a lean-out condition with SC you can easily melt your valves and pistons.