To my understanding earlier index injectors are able to be serviced however the outcomes are not favorable. It’s not worth the time or the expense to attempt the service injectors other than index 11’s and 12’s and the two companies, theinjectorshop and injector-rehab, likely won’t attempt to service without full disclosure that the service likely won’t bring the injectors up to operating specs. From my understanding, even the index 11’s success rate of this service is significantly less than index 12’s. Best to start with genuine seimens VDO index 12 injectors. My factory injectors installed on my 2012 bmw 335is are index 12’s and are going strong 110k miles later with no issues that I can tell (I’m full bolt on with stage 2 lpfp running e60, MHD BEF stacked JB4 running the flex BEF).
When I was looking on eBay I looked for index 12 injector “sets” pulled from a 2012 or newer bmw (I don’t know for sure but it seems like bmw stared installing index 12’s at the factory starting in roughly 2012). I emailed the seller to confirm what information they had on the “doner” car. There is also a possibility pulled injectors can be index 12’s from earlier model years but that would be due to an injector replacement and hopefully they would also have this information.
Here is information directly from Scott at theinjectorshop. “And I want to be very crystal clear on what I do and don’t do to the Piezo BMW injectors. The word “remanufactured” is very loosely used when it comes to gasoline injectors, whether they are standard port or GDI (Piezo included). I do not get caught up in using or telling my customers that I am going to rebuild/remanufacture any fuel injector, Piezo’s especially. Piezo injectors CANNOT be torn down and rebuilt like a common rail diesel Piezo injector, they simply cannot. Everyone, including GB, takes them apart as far as they can which is to remove the fuel inlet pipe, the micro filter in the inlet pipe fitting, and the lower compression seals, than sends them to multi stage cleaning. The only parts that can be replaced in/on the injector are the inlet pipe stainless washer, the inlet pipe micro filter, and the lower compression seal (de-couplers are recommended to be replaced when servicing these injectors and they will need to come from BMW, FCP Euro, or equivalent). If there is any failure internal to the injector the injector cannot be serviced, it must be replaced. After proper cleaning Piezo injectors need to be tested properly, and this is really where the rubber hits the road with these injectors. You have obviously been doing your homework as you see that myself and Injector Rehab are using the GDI specific equipment to test at operating pressure against OEM test plans, and YES, the equipment is manufactured by Carbon Zapp which is distributed in the US by GB Remanufacturing. Now by the definitions you quote below, this type of parts replacement and service can be offered as “rebuilt” or “remanufactured” because the necessary parts have been replaced, and they have been tested against an OEM test plan that can validate the injector is performing “to same-as-new, or better, condition and performance”. I just simply don’t play this word game. I used to own a carburetor rebuilding company so I am very comfortable with what it takes to truly rebuild something. My definition of this service IS NOT rebuilding/remanufacturing, it’s cleaning and testing. A very good service as I help customers all the time get these injectors back to normal performance, I just like to call it the way I see it. So the bottom line….if FCP Euro had a GB “remanufactured” injector, it would be the same product/service coming from me, I would just need your cores to do so.”
