It all started a week or so ago with a P0206 and sure enough that injector was open circuit.
Ordered a set of 8 off eBay. Installed 4 in the left hand bank yesterday and all seemed well enough, but after a few miles got CEL and P0175, too rich on left bank.
Today I installed the other 4, hoping that the difference between the banks was causing the issue, car could not feed enough fuel for the new injectors while trying to keep the old ones happy.

Epic fail, now have P0172 and P0175, both banks too rich.
STFT and LTFT are -25% and -20.4% for both banks.

So the obvious problem would be the new injectors and I guess I will go swap four old ones into the left bank and see if that settles it.
But, could it be anything else? I do not believe I missed/messed anything, and the fact that the left bank went rich almost immediately, then the right did the same after it got the new injectors, is too much of a coincidence.
There is nothing else I should be doing, like hard reset, or giving it 100 miles to learn the efficiency of the new injectors?
I am trying not to drive it to avoid catalyst damage. Here in California, that would be BAD news.

Thoughts?

 

I had no problems when I replaced one injector with a used one.

Your problem certainly sounds like the injectors.

I assume your new injectors are orange?

 

Here are the ones we bought, they look identical to the old ones (assume they are the originals). Orange colour, blue and black o-rings, fitted snugly, no leaks etc.
I wonder if they are XJR version and flow more fuel?


https://www.ebay.com/itm/15341123775...Condition=1000

Next move might actually be to buy a set of remanufactured ones, from a US based company, with good rating. That way no worries about mis-matched spray patterns, partially clogged, shorter lifespan, etc.
Certainly cannot justify a $1600 set of new ones from the dealer.

 

I use an injector cleaner fluid on a regular base from Liqui Moly in all of my cars. So far, no problems. This is maybe a cheap solution for your original ones. Or buy some from a dealer like Rockauto 2008 JAGUAR XJ8 4.2L V8 Einspritzdüse | RockAuto
Good luck
Torsten

 

If you still have your original injectors, google injector remanufacturing in your area. Unless they're "circuit open", you can have them rebuilt, internally cleaned, backflushed and flow tested for $25-35 each. Professional job will generally return them to near-new condition. Guarantee they will be better injectors than $70-for-8 no-name stuff from ebay.

 

Here is some good press from a rebuilder on knock off injectors