My car has been to dealership 3 times in two weeks for misfiring. First, fuel injector was replaced; following week, electronic coil on Number 5 replaced; following week, all coils on 1,3,5,7 replaced.
I picked up car on 5-18-17, got it half-way home, and car began to misfire again. "restricted Performance" light came on. I called dealership, and then I had to call a tow for the 4th time.
Any mechanical wisdom would be appreciated

 

Posted on wrong forum. This is the late model XJ (X351) forum. This needs to be moved to the XF forum, please

 

Welcome to the forum julesjag,

I've moved your question from X351 to X250 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 information 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

 

have them check your coolant for exhaust gases, or if there is a loss of coolant, or a bunch of white smoke on start up

 

Vacuum leaks form worn or cracked vacuum lines can give mi fire codes too.

 

Do you have the supercharged engine??
If so, check the vacuum line btwn the intake tube and supercharger.

Also, check your intake tube for cracks.

Hell my dealer didn't snug it up on mine and that caused it.

 

They can check whether there are air leaks using fuel trims. If not a leak then another cause of misfires is blocked cats. They should know that of course...