XJR 'Restricted Performance'

Moderator: J44EAG

Guymonde
Posts: 4
Joined: Thu Dec 05, 2013 7:23 pm

XJR 'Restricted Performance'

Postby Guymonde » Wed Oct 01, 2014 1:20 pm

My lovely XJR has developed a fault...
To start off with I just had 'Restricted Performance' with no engine light. Performance was down but hardly too severely - my thought was the supercharger was not working.
I was just about to go on a long trip so took it to my friendly neighbourhood non-specialist repairer. He fixed the fault by 'cleaning up the airflow' but wasn't convinced it was a proper fix and refused to charge me.
During my long trip, the problem recurred, this time with the engine warning light glowing amber as well as Restricted Performance. The Jaguar dealer in La Rochelle was 'too busy to look at it, book it in for 3 days hence' so I had no option but to live with the problem. Then it cleared itself, then recurred so back to said local repairer who has had another go (free of charge again) and all is currently well. He says the new part would cost £600 and he hates spending his clients' money (an excellent attribute!) but he's not a great communicator and I'm still puzzled what's going on here.
Any ideas?

ptjs1
Posts: 2526
Joined: Thu Apr 27, 2006 7:14 pm
Location: Kent

Re: XJR 'Restricted Performance'

Postby ptjs1 » Wed Oct 01, 2014 4:28 pm

Guymonde,

Sorry to hear of your problems. The "Restricted Performance" mode is a very broad category. The car invokes that mode if it sees a fault code thrown that it deems to merit a restricted performance from the car to prevent further damage. Certain codes will also cause the MIL (engine light) to come on. If the car doesn't see the same code on 3 occasions, it will reset the light until it next sees the code again. Sometimes, it will reset the MIL immediately on next start.

You really need to get someone to use a code reader and scan the car to identify the fault codes that have been thrown to start to really understand where is the problem. Even after the MIL has been reset, the codes will remain in memory to be read. The software used needs to be able to interrogate not just the engine ecu but also possibly the gearbox ecu, depending on where the fault originally emanated.

Just a suggestion, I wouldn't let anyone change any part until they can show to you through proper diagnosis that the part if faulty. So many owners just change part after part in a futile attempt to track down a problem.

Good luck

Paul
1995 XJS 4.0 Convertible
1980 XJ-S Pre-HE
Jaguar 4.2 Supercharged engine (but not with a Jaguar body..)

User avatar
robv12
Posts: 2052
Joined: Fri Oct 30, 2009 10:11 am
Location: scottish borders

Re: XJR 'Restricted Performance'

Postby robv12 » Wed Oct 01, 2014 7:40 pm

MIL on is there to warn you of a possible fault, RESTRICTED PERORMANCE is there to do JUST that to prevent any damage or further damage

First thing to do is get the car scanned, this will throw up and identify the codes, the correct scanner will tell you what those codes are

A favourite on V8 4.2 chargers, is a plug or coil gone down, this will give you the symptoms you describe, a cheap and easy fix

I am curious as to why some one who cant find or fix the fault is quoting £600 for parts, what parts are we talking about here??, what mileage has the car done??

Guymonde
Posts: 4
Joined: Thu Dec 05, 2013 7:23 pm

Re: XJR 'Restricted Performance'

Postby Guymonde » Thu Oct 02, 2014 10:02 am

Thanks for your thoughts, both.
He has certainly run some diagnostics though - not being a Jag specialist - I'm not sure how precise he can be with error codes etc.
I think it's not so much that he doesn't know what the problem is, more that he doesn't communicate very clearly. I'm conscious that this might actually need a specialist but the other part of me is very grateful for a local repairer who is very careful with my money, and hitherto has fixed the problem for free! I'm just not sure whether it's a long term fix, and nor is my man.
The car has done about 90000.

User avatar
andypryce
Posts: 502
Joined: Sat Apr 24, 2010 12:43 am
Location: Liverpool

Re: XJR 'Restricted Performance'

Postby andypryce » Thu Oct 02, 2014 1:11 pm

You could buy a code reader, they are not expensive, and get the codes yourself and post them back on here or google them, that way people should be able to better advise. I agree dont spend any money until you can be confident it will fix the problem.

andy
andy

2006 XK

User avatar
robv12
Posts: 2052
Joined: Fri Oct 30, 2009 10:11 am
Location: scottish borders

Re: XJR 'Restricted Performance'

Postby robv12 » Thu Oct 02, 2014 4:48 pm

90K miles, plugs are due a change at 100K , so I would in fact start here, easy and cheap, allow an hour to change at max

User avatar
jagecosse
Posts: 8
Joined: Wed Jan 15, 2014 1:54 pm

Re: XJR 'Restricted Performance'

Postby jagecosse » Wed Dec 24, 2014 4:57 pm

I have had a similar problem off and on for some time now. The RESTRICTED PERFORMANCE warning comes up sometimes if I accelerate harder than usual when joining a motorway or such like. I bought a scanner and found that it reported an upstream lambda sensor was malfunctioning. I cleared the codes and drove the car for a while before the light came on again. I will change the sensor by purchasing one online. Like others have said some faults can be misleading and i have read on other forums of MAF sensors being dirty and causing spurious faults to be reported.

I bought two scanners. One that plugs into the diagnostic socket and communicates with a PC, mobile phone or other Android device using Bluetooth. It didn't work with my iPad as Apple have implemented something in their connectivity that prohibits this type of device working. I bought another which works using wifi and that talks to the iPad very well.
2007 XJR LHD, Frost Blue

Guymonde
Posts: 4
Joined: Thu Dec 05, 2013 7:23 pm

Re: XJR 'Restricted Performance'

Postby Guymonde » Sat Aug 22, 2015 2:56 pm

I have continued to live with this intermittent problem (it is currently Ok) but it has now been joined by two other intermittent 'problems'.
The first of these is 'air suspension fault' accompanied by an amber warning. This 'fault' happens quite often and has for a while. But there is no detectable change in the suspension and it always rights itself very quickly, usually in a minute or two.
The second is more worrying 'engine coolant low' accompanied by a red light. However the coolant is not low and the engine temp is normal.
I'd really like to get all this fixed, either by a specialist or by DIY - but my competence at DIY runs out fairly quickly.
So can anyone suggest a specialist, accessible from West London, or where to buy a code reader (and perhaps a workshop manual)
Thanks

User avatar
robv12
Posts: 2052
Joined: Fri Oct 30, 2009 10:11 am
Location: scottish borders

Re: XJR 'Restricted Performance'

Postby robv12 » Tue Aug 25, 2015 5:44 pm

ok, cheap generic code readers will not work on a 350, you do need Jaguar SDD or a good system such as Autologic with the Jaguar upgrade

Coolant level low, will be a sensor failing in the bottom of the header tank

Air suspension fault, will be a lazy compressor, the car has a time limit to get the compressor up to the correct pressure, if this time is exceeded it throws the light, rectification is easy and cheap, buy a new seal kit off ebay for £15.00, remove the front bumper, remove the pump, take off the pump head, remove old seal, and as they say re-assembly is the reverse, I'm sure I did a "how to" on this so will have a dig about and see if U can find it

Restricted performance, can be many things and hence the car will need a scan, BUT one easy trick on 350R, is remove the engine cover, it just pulls away, at the back of the intake plenums there is a vacuum intake, the rubber elbow goes soft, falls off and throws the light, worth a check for a two minute job
88 3.6 XJ40 EX JDHT
88 3.6 XJ40 SOV
93 XJ40 XJ12
94 XJ40 3.2 Majestic Gold
94 XJ40 Daimler Majestic Insignia
93 XJ40 XJ6 3.2 paint test car
97 XJR 300 Manual
97 XJR 300 Manual EXJDHT
55 XTYPE EST 3.0 SP PREM
62 351 LWB PREM LUX

User avatar
robv12
Posts: 2052
Joined: Fri Oct 30, 2009 10:11 am
Location: scottish borders

Re: XJR 'Restricted Performance'

Postby robv12 » Tue Aug 25, 2015 5:46 pm

the pump replacement pictures are half way down this post

http://www.jec.org.uk/forums/viewtopic.php?f=290&t=8287
88 3.6 XJ40 EX JDHT
88 3.6 XJ40 SOV
93 XJ40 XJ12
94 XJ40 3.2 Majestic Gold
94 XJ40 Daimler Majestic Insignia
93 XJ40 XJ6 3.2 paint test car
97 XJR 300 Manual
97 XJR 300 Manual EXJDHT
55 XTYPE EST 3.0 SP PREM
62 351 LWB PREM LUX

ptjs1
Posts: 2526
Joined: Thu Apr 27, 2006 7:14 pm
Location: Kent

Re: XJR 'Restricted Performance'

Postby ptjs1 » Wed Aug 26, 2015 10:09 am

Guymonde,

Not too far away. You'll get good service from Ray at Surrey Jags in Coulsdon.

Good luck

Paul
1995 XJS 4.0 Convertible
1980 XJ-S Pre-HE
Jaguar 4.2 Supercharged engine (but not with a Jaguar body..)

User avatar
robv12
Posts: 2052
Joined: Fri Oct 30, 2009 10:11 am
Location: scottish borders

Re: XJR 'Restricted Performance'

Postby robv12 » Wed Aug 26, 2015 5:37 pm

How about Powerbell , they have an ad in the magazine, I hear only good reports, no experience of them though

Guymonde
Posts: 4
Joined: Thu Dec 05, 2013 7:23 pm

Re: XJR 'Restricted Performance'

Postby Guymonde » Wed Aug 24, 2016 5:13 pm

Well, here we are again. As suggested I tried a Jag specialist. They plugged in a diagnostic thingy which instantly fixed the 'restricted performance' - for a while - and I took it in for a hospital stay. The fixed the parking sensors (and they stayed fixed) fixed the 'air suspension fault' but it failed again the same day and didn't fix the 'engine coolant low' at all. The air suspension thing is now on virtually all the time except just after a start. The restricted performance comes and goes with no detectable rhyme nor reason. Fortunately the performance is not THAT restricted and it doesn't seem to augur a disaster (I have done 30,000 miles with it intermittently intervening) but it don't arf interfere with the fun of driving an XJR.
So now I'm back to square one - three problems (at least one of which - restricted performance - is real), and having lost faith in my 'local' specialist which is anyway a good hour's trip away.
So I bought a diagnostic tool and I get:
P0101
P1111
P2601 (twice).
It's quite a cool toy but I have no idea what to do next!
Any suggestions would be very welcome.
On a separate note, I drove the damn thing into a concrete pillar and have a very nasty scrawp on the rear wheel arch. Can a standard body shop do the bus or do I need a specialist in aluminium?

ptjs1
Posts: 2526
Joined: Thu Apr 27, 2006 7:14 pm
Location: Kent

Re: XJR 'Restricted Performance'

Postby ptjs1 » Wed Aug 24, 2016 5:49 pm

Guymonde,

I'm sure you know what the codes mean (MAF out of range, normal test check complete & Aux Coolant Pump). So, I would find a proper Jaguar specialist and take the car in there for investigation. It sounds like it's beyond the capabilities or knowledge of your local people.

Good luck

Paul
1995 XJS 4.0 Convertible
1980 XJ-S Pre-HE
Jaguar 4.2 Supercharged engine (but not with a Jaguar body..)

User avatar
J44EAG
Posts: 5606
Joined: Sat Oct 20, 2007 9:57 pm
Location: Warlingham Surrey/Faversham Kent

Re: XJR 'Restricted Performance'

Postby J44EAG » Wed Aug 24, 2016 6:38 pm

Some of this has been covered in my "19 day glitch article" to be found in our latest magazine.

A genuine Denso MAF sensor is around £138 from a Main Dealer and is unique to the XJR 4.2. A MAF sensor can be a fickle part. They do more than just work or fail. My experience shows they can deteriorate gradually but keep working to greater or lesser degree. Fit a new one if no other sensible diagnostic work reveals a problem.

A standard Hella supercharger pump is around £179 from a Main Dealer. An alternative high flow Bosch unit is available from AVT Tuning for around £135 and is uprated and said to be more reliable. It is the one that drag racers use because they rarely fail and are high flow. You can detect if a supercharger pump is working. With the ignition key turned to the first position, stand by the OS headlight cluster. You should hear the pump running. If not, check fuse F27 in the engine compartment fuse box has not blown.

Many glitches, some of a spurious nature may be caused by an unstable battery platform. In other works a tired battery. Replacement can work wonders.

Note also that a simple rotted vac pipe or two around the throttle body area can cause hugely frustrating issues. Again my article details what can occur. Space is tight and repairs in that area can prove most difficult. I have an article about those issues awaiting copy space in a forthcoming magazine.

Mike
X350 Co-ordinator

2004 XJR


Who is online

Users browsing this forum: No registered users and 1 guest