XF very, very rough Idle then dies

Hi all,
I do hope somebody can help me, I’ve tried all of the UK forums but it still has people stumped.

My one owner 2011, 3.0 Premium Luxury has developed a very rough idle on first start up then dies after about two seconds, if I press the accelerator nothing happens. I’ve pulled the codes but nothing relates to this issue and I.ve checked the start up pressure which is 40.000 KPA. I’ve replaced the fuel filter and check the lift pum in the tank which is giving a resistance of 3.1 on my multimeter and I can feel the pump energising when the ignition is switched on.

Has anybody had a similaer experience or is there anybody out there with an idea of where I need to go next? My local indy doesn’t want to touch it so I really have to sort it myself as I’m not paying main dealer prices until it’s the last resort.


Hi Alan and welcome to the forum.
First off we probably need a little more information, I am assuming from your ‘lift pump’ that the car is diesel?

Apologies Robin,

Yes it is, this afternoon I’ve carried out a pressure test and I’m getting 7,687,0001 at start up which equates to around 52-53000 KPA. wth the ignition on prior to cranking over I have 4,226,20873 which is approximately 29000 KPA fuel rail pressure. HPFP failure perhaps?


Hi Alan, no probs, unfortunately I have no experience with the XF diesel but that sounds like the next possible culprit. With the diesel you take out one variable over the petrol which is spark. So you need fuel and compression and the correct injection timing.

You might try to inspect and clean the throttle body. The air intake could be jammed. Otherwise you have done all the obvious things I could think of. I just got an XF and I am taking it to the dealer for the first time for an oil change and I don’t like dealers either but I have to give them one chance.

Hi Carsoncitysmith,

Thanks for your reply, that’s something I hadn’t given a thought to but it’s certainly worth investigating. The car’s only done 71000 from new but with supermarket grade diesel I guess anything is possible. I’ll get back to you once I’ve inspected it.


Hi Alan did you ever get to the bottom of problem, as my 2011 jaguar has done the same as yours

Hi Brian,
I did but I found out the hard way. I put my car into “JLR Specialists” on the Wirral, give them the widest possible berth you can. He told me it was water in the fuel, cleared out the tank, replaced the filter and tried to start it. He came back to me saying that a number of injectors had “popped” due to the water pressure - replaced with new ones and still the same. Then he said it was the inlet manifold that was cracked so I bought a new on and delivered it to him. He then pushed my car out onto the street and left it there, I only found out about it two weeks later when a work colleague told me it was causing an obstruction for the nearby school.

The reason I mention this is he wasn’t the first to say it was a fuel issue, I had a guy who had previously said that it was the high pressure fuel pump so bear this in mind when your looking for a specialist.

Once I was told my car was causing an obstruction I had it moved to Southport Jag Centre who, within an hour, had diagnosed the problem but to confirm he’d have to remove the rocker cover - he was telling me this as at that point he wasn’t going to charge me, I gave him the go ahead and he called me back telling me that the cam chain from bank A to bank B had snapped but all the rockers looked ok so he didn’t think there was any piston or valve damaged. He asked if I wanted to take a chance putting a new chain on adding that he’d done two previously with success so I gave him the go ahead and I was lucky.

I think to change the chain alone was between £600 - 700 but because I’ve had the car from new and intend keeping it I had the timing and fuel belts done, full service and some rectification work from the previous guy which in total cost me £1500.00 I was happy to pay that as I’m currently in the process of taking the so called “specialist” to court so I’ll get a large part of that back.

Sorry for the long winded response but when I was looking I couldn’t get much info at all and was constantly frustrated. Not sure where you’re based but if Southport is reasonably close to you then I can’t recommend Mark enough, my car runs better than I ever remember and I also have a reliable guy who moved my car for a very reasonable £80.00 and gave me a statement regarding its condition when collected so he’s very trustworthy.

If you need any more info please feel free to mail me.

Cheers and good luck

Gojng to investigate tonight after work I have a camera that can go in the oil filler , we are in fife Scotland near St Andrews
Brian Cunningham

Let me know how you get on and fingers crossed that it’s nothing more serious than mine.

Here’s a diagram to give you an idea of what it looks like in there - hope this helps you.

Hello @Mekkman
I know this is an older thread but I do have the exact same problem with my car
The image you put up isn’t a 3.0 diesel as this engine has the external toothed belt from the crank to outer cam and then a small chain on the inside.

can you, or someone, confirm that it’s the small chain that snapped. I’ve never heard of one snapping until I read this post.

By some coincidence, I was watching this today. This is the AJV8, of course, and I had never heard of the chain breaking, just the tensioner\guide issues. However, your pic looks like a similar setup, so obviously happens.

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That is sooo sad, thats a lovely looking car.

I don’t like those wheels, but I love that colour.
Back in the day E Types, among others, were parked up because of what were repairs more costly than the value of the car, only to resurface decades later as desirable “barn finds”. Will the same happen with XK8 's?

Hopefully, I was at a Webbs Auction house viewing a few months ago and there was a 1999 xk8 and the estimate was in the low $nz40k whereas I would be lucky to see anything like $nz14k for my 1999XJR ostensibly the same running gear just a different body grrrr.

$40K? Tell 'em they’re dreaming. Last year I tried to sell my convertible and had no interest at $25K, and there are several still on Trademe from that time at around that price. I suspect their reputation is putting people off.
Since I couldn’t sell it, I sold the Sovereign and spent a bit on the XK. It is now mechanically perfect and cosmetically very nearly so, and I am enjoying it more and more. Over the limited mileage I now do since I retired, it’s actually cheaper to run on an annual basis than my Hilux ute.
BTW , have you now returned from down south? How was it?