I have a slightly modified 2004 XJR. The modifications include cold air filter, cat bypass (custom), Mina mufflers, and the smaller blower pulley. I recently did a service including new coils and plugs, new mass air & map sensors, had the supercharger off to also replace the heater hose(basically complete cooling system). It was a tedious job (no doubt) took a few weeks to figure it all out. I recently moved across country and no longer have a shop or tools to do the work myself. I'm currently having problems with the restricted performance light coming on once in a while and the check engine light is on. The car runs rich at a cold start but then runs fine. The cars also is running like a beast when the restricted performance light is off (which is 85% of the time). My brother has a S65 Renntech that's over 700hp at the wheels and on the freeway he only pulls away from me slowly. The only thing I have yet to replace since I bought the car in 2006 with 16k miles on it is the oxygen sensors. Does anyone have any ideas for me?

 

Welcome to the forum sheerant,

Good to have you with us at Jaguar forums.

I can see you have already found your way to the X350 tech section so there's no need for a link to it from me.

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Enjoy the forums.

Graham

 

Welcome to the forum

 

Welcome to Jaguar Forums sheerant,

Good to have you with us.
Enjoy the forum.

If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help

 

Yeah codes always help unless youre into guessing, but for a guess how about p0171,p0174 lean engine from vacuum leak at induction elbow where brake booster pipe plugs in. Brittle or gone oring.
There $50 please

 

welcome to the forum - you will find plenty of info and support here - enjoy!!

 

Welcome!

 

Is that one of the tubes that go into the throttle body under the fire wall?

 

Is that one of the 2 tubes that go into the throttle body?

 

Welcome to the forums!

 

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