My 2002 X Type has recently started to judder really badly when stopping at red lights, the whole car judders as soon as it comes to slow/ stop. It's an automatic.

 

Welcome to the forum Claire B,

I've moved your question from General Tech Help to X-Type forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Probably a vacuum leak but will need more information to help. Any warning lights on? Has the vehicle been serviced recently? Does the car idle rough? Tell us as much as you can.

 

No warning lights showing at all and no other issues with her, it started all of a sudden the other day and now does this every time we slow to stop at traffic lights then try to accelerate when the lights change and she starts kangaroo jumping. Does it whether she is in automatic or manual makes no difference. Think am going to have to take her in and get it properly looked at but just wondered if anyone had any ideas. Thank you!

 

+1 vac leak
DIY - watch fuel trims

 

Nice one thank you, is it pretty simple to do?

 

Use search - same thing for any modern (petrol) car.

 

Claire: Is the engine diesel or petrol?

If diesel, I'll defer to the diesel owners on this forum.

If petrol, the rough idle is likely caused by a small vacuum leak, and 3 likely culprits are pictured in this post: https://www.jaguarforums.com/forum/x...2/#post1032108

Leak #1) The PVC breather hose (pictures 3 & 4): Your 2002 X-Type came from the factory with a smooth PVC hose. Age and engine heat causes this smooth hose to crack and leak on the bottom, or to become loose where it connections to the manifold. If your car has a smooth hose, replace it with a new hose, which has a rough surface and withstands engine heat better than the smooth hose. Search the Internet for "jaguar x-type pvc hose". This post has pictures of both hoses: https://www.jaguarforums.com/forum/x...74/#post670064

Leak #2) Brake Booster Check Valve (picture #6): The black & light grey plastic check valve in the brake booster line becomes chalky and leaks, again from engine heat & age. The permanent solution is to replace it, but a quick, temporary fix is to coat it with RTV Silicone (sold at auto parts stores), wrap it tightly with a small piece of aluminum foil, and wait a few minutes for the silicone to cure. This post has pictures of a cracked check valve, and below it are pictures of a check valve wrapped in aluminum and RTV silicone: https://www.jaguarforums.com/forum/x...5/#post1231741

Leak #3) IMT O-rings (picture #5): Your 2002 X-Type came from the factory with undersized yellow O-rings on the IMT valves. With age and heat these yellow O-rings become stiff, allowing air leaks. Jaguar's remedy: thicker green O-rings. Search the Internet for "jaguar x-type imt o-ring". This video shows how to replace them:
Hopefully this helps. Ask if you have any questions. The more details you provide, the better we can assist you.

 

She is petrol, thank you so much for your help that was brilliant and so informative thank you very much

 

Thanks to everyone who gave advice regarding my x type jumping. She has had a full service today and had the hose replaced and a new clip put on.
I appreciate all your help thank you.

 

Claire: The simple explanation is too much air was leaking into the engine thru the old PVC hose. At highway speeds, the engine 'breaths' a lot of air and doesn't complain much about breathing a little extra air thru the leaky hose. But at a stop light, the engine breathes only a small amount of air, and complains that it has to breath the additional air from the leaky hose, so it judders to let you know it's unhappy. When you ask the engine to accelerate from a stop light, you ask it to start breathing more air, but it already has too much air from the leaky hose, so it 'complains' to you even more, with stronger judders.

Glad you're engine is again breathing without the leak and complaints.

 

That is a great explanation, makes perfect sense when you put it like that. Was relieved it wasn't anything more serious, gives quite a shock when it first started doing it so this was a big relief.
Everyone on here has been so helpful, thank you for taking the time to explain it really appreciated.