Anybody recognise these noises? Sounds bad.

In terms of fault codes, it always immediately detects a misfire on cylinder 6, and then the rest on that bank follow after.

Stored fault codes are:

Stored fault codes are:

P0300 - random misfire detected
P0306 - cylinder 6 misfire
P0307 - cyl 7 misfire
P1315 - persistent misfire
P228F fuel pressure regulator 1 exceeded learning limits - too high

also a tempory faul code of:
P00C6 - Fuel rail pressure too low - engine cranking
P0306 - cylinder 6 misfire
P0305 - cyl 5 misfire
P0308 - cyl 8 misfire
P0307 - cyl 7 misfire


so it's misfiring down one bank, and reporting fuel pressure regulator problems.

Could it just be a faulty FPR ? Or might the fuel pressure faults be consequential from a greater problem e.g completely ruined head or block on that side ?

 

What's a bit strange, is that other reports that might otherwise fit the bill, (fuel rail failure on one side), list the cylinders as 2,4,6,8..

yet mine says 5,6,7,8

?

(i have just confirmed 5,6,7,8 is the left -side (UK passenger side), so that's fine. Not sure what the other poster's post was about then.

 

Car is a 2014 XFR with about 38,000 miles on it.

 

I really doubt that. I believe Jaguar adopted the standard (ISO/SAE) numbering.

 

Ah, interesting, thanks. I misread the diagram!. It shows different numbering for ford and iso/sae, but I think you're right.

I have the workshop manual now anyway so will have to study it. Perhaps it is one of the fuel pumps after all then.

That points to the rear half of the engine then.
i need to get sdd set up.

 

Right, well here's a turn up, and maybe an idea next time anyone else has a cylinder down & random misfires over ~4 cylinders:

The car is now running fine. We nannied it home (2 - 3 miles) from the office car-park late last night, trying to barely use the throttle. I have been back to the car a number of times in the week, using SDD and other tools to read/clear faults, etc, and it's been completely down one cylinder, smoking a lot and wobbling/shaking.

Well, while trying to get it into my back garden this morning, ready for me to pull the fuel rails and swap 1 or more injectors this week (I have 5 new injectors coming on Monday.. got a good deal on them), well it ran out of fuel. I cranked it a few times, but was pretty sure it was just out of fuel..

I was trapped in the car because the driveway down the side of my house is pretty narrow, so I phoned my girlfriend to come and move the wheelie bins that were by the car's rear door, then climbed out. I went and got some petrol, put it in, and, after about 5 attempts to start, it ran absolutely fine. I've been out in it and covered quite a few miles, stopped / started about 5 times over the afternoon, and, touch-wood, it's fine. I've put some injector cleaner into it. I sort of think those things are snake-oil, but JLR do recommend trying some BG 44K when you have 5.0 injector failure, so maybe there's something to it.

It was misfiring / not running at all on cylinder no6, and then the surrounding back 4 cylinders, (4, 5 & 7) would intermittently misfire. On that basis I was going to change injector no6, and then if it still didn't run, I'd change the other 3 (not in an attempt to save money, but more to understand what had actually failed rather than just replacing all 4 injectors in one go). I was doing that on the basis that it might be one completely down cylinder causing the surrounding cylinders to run badly.

I can only assume that cranking with empty fuel lines has cleared a stuck injector. This may be a new thing for people to try when they have these symptoms. I had been back to the car many times over the week and it was well and truly knackered. Now it's sweet as anything. The nasty rattle from the top of the engine is apparently expected from an un-loaded supercharger, and especially from the supercharger when the engine is misfiring.

The crazy thing is, if there had been just a drop more fuel in the car, I hadn't run out of fuel, I'd never have known, and I'd be well on my way to fitting new injectors..

Oh, I forgot to say, after it started running properly, I ran the powertrain adaptation reset from SDD to reset fuel trims.

 

The car is now running fine. We nannied it home (2 - 3 miles) from the office car-park late last night, trying to barely use the throttle. I have been back to the car a number of times in the week, using SDD and other tools to read/clear faults, etc, and it's been completely down one cylinder, smoking a lot and wobbling/shaking.

Ok, so my 2012 XFR has been at the shop for a week with Indy's scratching their head. When I dropped it off, it was down one cylinder and another presumed melted plug. They called to tell me that when I was started again, that it shook badly and all cylinders were misfiring per the code reader. I dropped the car off with very little gas remaining in the car (reading 5 miles to left of gas). Could this be the same scenario? Dirty injector? Dirty gas?

 

Well it's certainly possible isn't it, although I'm still thinking mine was a stuck or blocked injector that was cleared by cranking ~ 10 times with no fuel in the lines.

If it was bad fuel, I don't see why only cylinder 6 would be non-running, and 5, 7, 8 would be misfiring.. always those cylinders only.

 

I cleaned injectors after replacing VVT solenoid on both sides and only ON driver side UK - right side viewed from inside car do I still have persistent misfires 2,4,6.8

replacing VVT solenoids on both side left only the ledt side 2,4,6,8
new fuel filter, 4 engine flushes, new spark plugs, 2 new VVTs and only left side- initial was 2,4,6,8,3,5,7 misfires.

I am thinking I got a bad VVT solenoid replacement since the one side cleared up.

 

You don't have a 5.0L V-8?? Injectors are completely different as the 5.0L V-8 had DI and the earlier 4.2L V-8 does not.
Plus the 5.0L engines don't have a fuel filter you can replace. It's built into the fuel pump.

I would post in the correct section for your car to get better answers.
.
.
.

 

yeah I know difference between 5.0 and 4.2
thanks
was not paying attention to the thread just noticed it had similar misfire conditions.

can post to proper thread with engine type.

 

something that is consistent with ALL Internal Combustion Engines - Fuel, Air and spark the rest is performance enhancements - once its isolated to one of those areas the rest is just algebra.

 

i have been combing through all the misfire threads and im leaning toward the cats are causing your misfire as many have