Question about 1999 Jaguar XJ

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I have a 99 jaguar xj8 van den plaus edition. It says resdtricted performance when it Gets warm and check eng. Light stays on. I replaced the computer any ideas

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For the money you spent on another computer, you could have brought your car to a qualified mechanic and had the problem correctly diagnosed and repaired. 'Restricted performance' meant the computer saw something wrong in the engine, and restricted the performance to keep from destroying the engine. You killed the messenger and still have the same problem.

Posted on Dec 08, 2016

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We have a xj8 99 and restricted performance light comes on only when car gets warm. We changed the computer but still have the problem check eng. Light is on to. Any ideas


run the fault codes as the engine light is warning you of potentially expensive problems if you continue to ignore the warning
The ECM puts the car in limp mode to help protect the engine and transmission form damage but if you continue to play at fixing rather than going to a specialist shop and have the codes read to really fix the fault it will cost you big money

Dec 07, 2016 | 1999 Jaguar XJ

2 Answers

2004 Jaguar, Vaden Plaus,car just quit running going down the road. Had to have it towed home Won't start,turns over, just won't start,says Restricted Performance.


Sounds like it is some type of 'limp home' mode.
It could be anything. It might be as simple as a bad Fuel Pump Relay. When you turn the Key to the ON position (not Start) can you hear a little buzz for about 1 second? That would be your fuel pump running. You need to see if the engine is getting gas and spark.

Jan 05, 2016 | Cars & Trucks

1 Answer

Performance restriction


performance restriction popped on, then engine light stayed on. Any solutions?

Mar 04, 2011 | 2001 Jaguar XJ8

1 Answer

The restricted performance light keeps coming on usually when the engine gets warm ? this is a jaguar xj8 3.2 sport 1998 model


could be numerous causes, it is logging a code when the light comes on, have the codes pulled to direct you in the correct repair

Jan 17, 2010 | 2001 Jaguar XJ8

3 Answers

My 2001 Jaguar XJ8 seems to run rather hot; although no problems; however I have an amber engine light that stays on. My car runs fine other than that. I just went to Auto Zone and had the codes checked...


I am not familiar with the light your speaking of (I am assuming a warning light for engine heat?) if she's running warm the thermostate may be failing or stuck in a partially closed/open position.

If the light is an Engine Check light then yes is may be as simple as a faulty fuel cap not holding presure within the tank. You'll note some cars when you open the cap there is a small "huff" of air as the cap is removed.
I hope this may have helped,
Tom

Sep 18, 2009 | 2001 Jaguar XJ8

1 Answer

I have a 1999 Jaguar XJ8, there is a Check Engine


the gas gauge is not related, that would be a defective gas gauge sending unit in the gas tank, the check engine light indicates that one of around 200 poss faults has occured in the electronic engine controls, you will need to have the OBD 2 engine control system tested for the fualt code that is stored when the light is turned on.

Sep 10, 2009 | 1999 Jaguar XJ

1 Answer

2001 Jaguar XJ8 Engine Light/Stuttering


have you checked the o2 sensors on your exhaust

May 28, 2009 | 2001 Jaguar XJ8

1 Answer

2001 Jaguar XJ8 Idles rough while sitting


o2 sensors often cause a rough idle at stand still. Previously my xj8 had crank case ventilation (pvc valve essentially) issues that caused the check engine w/ restricted performance. I noticed a severe drop in gas mileage as well. Jaguar dealer fixed my problems in a few hours and it was surprisingly cheap. Its worth taking it to advanced or auto zone to see what the computer says. Then decide if you want to shell out for a dealer fix or if you can tackle it yourself. BTW, just to justify myself this is my third jaguar. I have a '94 xj6 with a chevy 350 inside it, previously owned a 95 XJ6 and currently have the xj8. They are wonderful cars if you can put up with their rough times.

Apr 08, 2009 | 2001 Jaguar XJ8

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