I recently obtained a 2004 XJ8 which is now just nudging over 100k miles. On a recent long distance trip, I got the dreaded “restricted performance” error message on the way home. When I scanned for OBD-II trouble codes on return, I found misfiring on cylinder 7. I pulled the injector and coil and replaced them, with the code and error message eliminated. A short time after that I replaced all the other coils and all spark plugs.
But it brought to mind the question as to the condition of the other seven injectors. I’m unfamiliar with what should be the normal life of fuel injectors for this Jag and am wondering if, from a maintenance standpoint, they all should be changed out at this point. If so, has anyone used reconditioned injectors or do you have a particular brand of new or reconditioned you favor.
Has anyone had any luck with running any of the injector cleaners through their fuel systems–Techron’s or LiquiMoly’s? Any benefit to that? I know that on my F-150, the fuel gauge in one of the tanks stopped working after I added Techron following a fill and this appeared to be a regular problem with that particular model of fuel pump, based on forum comments. Any issues with use of injector cleaners in the Jag?