Good evening everyone.

My names Matt and I am new to the forum with this being my first post. sorry this is going to be a long read.

I recently bought a XF 3.0d S with 125k on the clock and with a "restricted performance" issue that I was hoping to fix. I got it cheap because of the restriction and couldn't pass up the offer.

I am a mechanic by trade so know my way around some makes and models mostly year 2000's and prior and not to up to scratch with modern cars.



So a little about the car, the chap who had it before me had the warning come so he took it to a dealer who diagnosed it as a turbo needing replacing. They carried out a smoke test and found it leaking from the turbo housing also found a P1247-00 low boost pressure DTC.



He then took it to a independent garage who diagnosed it with a clip missing from the intake pipe to compressor housing (miss diagnosed leak test from jaguar) they refitted it correctly and carried out a vacuum test. They found that a pressure control solenoid was faulty so replaced it. This did not fix the fault. They also found a split pipe from the vacuum test so replaced that which still did not fix the fault.



He then took it to a 2nd independent garage who found a DTC for low boost pressure, engine oil temp sensor circuit, ride height sensor F/R, Air flow sensor fault. They replaced one Air Flow Sensor and put a turbo on from the recommendation from jaguar, again this did not fix the fault.



He then took it to a 3rd intendant garage who found only the P1247-00 low boost pressure DTC, They checked the wiring and vacuum operation which came back ok. They then removed the exhaust and took it for a road test to which no faults were thrown. There recommendation is to clean the exhaust system.



He then took it to a 4th garage who specialised in cleaning DPF's. They took it off cleaned it, re-fitted it and this cleared the codes and the car drove perfectly.



He then had the car on his drive way after getting a work van and only used the jag every now and then. With no substantial long journey. after 2-3 months the restricted mode came back, to which he then sold it to myself.



I have had the car a couple of weeks now and found that the only fault code to be the P1247-00 low boost pressure. I can drive the car as long as I keep it below 2000 rpm by manually changing the gears. As soon as I go above 2k it RP's, I also noticed the "service due" notification was on but have since reset this after carrying out a service.. Work I have carried out is so far, changed the recirculation valve with new OEM part. the old one looked ok no rust but heard this is a point of failure, whilst that was off I renewed all jubilee clips on all boost pipes, I replaced the O-rings on any part I could see oil leakage around its general area, on the throttle body housing and the elbow connecting to this. I gave the throttle body a good clean out as well as the EGR pipes connecting to it and the elbow piece connecting it to the intercooler pipe. Changed the fuel, oil and air filter with OEM parts. Oil changed using Millers 5W30 C1. I have visually inspected the intercooler to which I cant see any cracks or the orange gasket sticking out, I have also visually inspected the manifolds to which I cant see any cracks (no oil marks around the manifolds or intercooler) I still have the P1247-00 code and restricted performance mode. I have bought a leak tester to try next also to look for any boost leaks, but previous test came back ok. I also have an Autel 808 pro that can carry out a forced DPF regen.



I find strange is that previously it didn't throw any faults or have any DPF warnings on the dash or stored on the ECU when they carried out the clean previously which fixed it before. Can the DPF block on these enough to cause restricted performance without throwing any DTC's? also I have read up that the turbo boost actuator on the can get sticky would this cause my issue considering it happens at 2000 rpm?



Sorry for the long read, I am kind of pulling my hair out with this one.

 

Try posting this on the UK based site www.jaguarforum.com. This site is the US based site & whilst very good, Jaguar never sold diesels there.

 

 

 

Trigger this might help you.
Just posted this.
I have a 2013 Jaguar XF Sport brake 2.2 diesel. The car now has 65k on the clock but only 48k when I bought it.

One of the things that disappoint me with the car when I first bought it was what appeared to be a Turbo lag specifically when I pulled out of my road on to the main road which is a sharp uphill pull away. The car would lag in acceleration for a couple of seconds before the Turbo kicked in and away she went. Never having driven an XF before I just assumed this was a tuning fault which could possibly be rectified by a remap but never went there. I could live with it.

A couple of days ago I had a big red triangle come up with “Reduced Performance” and the car went into limp mode. Would not accelerate above 2000 rpm and had no power to get up any hills faster than 25 mph. Called out the RAC (as they are freeish) and they plugged in the computer and I had numerous codes relating to the Turbo and Turboactuator. No hoses were loose or holed, the Turbo was not making any noises it was just not spooling up. Jaguar does not sell the actuator stand alone only a Turbo and Actuator for around £1300 according to my local Jaguar Indy.

Found a company on Ebay called Essexrecon who sell refurbished Actuators for £125 and thought it might be cheaper than a new Turbo and how hard can it be to fit. There are others who supply them for a similar price.

Actuator arrived today and although access is restricted and fiddly the part is only held on with four 8mm bolts and a circlip. Careful not to drop anything as to do so would mean removing the belly pan to retrieve it I removed the old and fitted the new. Took no more than an hour. I came across this youtube video of the old and the new side by side and this was exactly as mine was.

Very slow to return compared to the new one.

Having fitted the new Actuator I took the car for a test run and the first thing I noticed straight away pulling out of my road was the pickup in acceleration up the hill was superb. No lag in the Turbo what so ever. No red triangle, instant power, good result. I will take the car into my local garage and have all the fault codes cleared next week.

So in summary if you are suffering from a little bit of Turbo lag have the Actuator checked and possibly replaced before you breakdown on an important journey and are left stranded at the bottom of a hill.