Mixed Fuel Injectors

[BMW2k10]

I've got a bad injector on Cylinder #6. I checked to see what index it was so I could just replace that one bad injector,but they are different..

Cylinder #1 and #6 are an Index 7 and
Cylinder #2-#5 are index 8

Should I get another Index 7 for the Cylinder# 6 misfire or should I go a different route? Thanks

[jclausen]

I think now there up to 13, so those are all old, I don't think you have a choice you will get the most current one and BMW recommends that if there old numbers, to replace 3 as the minumin

[Codes2]

Current is Index 12 to my knowledge. (just bought and installed)

Bank 1 and Bank 2 should each have the same index, so when you configure the banks, the whole bank will match.
I forget at this time, but I believe it's ill advised to mix 11+ with older. I'd have to read up again to be sure.

I'm not certain of criticality between Index 7 and 8 in the same bank.
Myself, I run Index 8 and Cyl 1, 2 and 3. Then Index 7 in 4, 5 & 6.

Since you have 1 bad Index 7 and one remaining, it makes sense to move all to Index 8, or go new, to Index 12.
Index 7 & 8 will likely start leaking when the engine is off, due to age. Two or 3 of my 6 were leaking. I replaced all with Index 12, for $1900 CAD. Pricey.

If interested in buying a couple of my Index 8 that didn't leak, let me know. (PM only)
Note: All old hardware runs the risk of imminent failure. 2008 was a long time ago.

[Critter7r]

if the engine has a misfire on cylinder 1, replace injectors for cylinders 1-3 if those injectors are not already index 11 or higher.
If the injectors on that bank are already index 11 or higher, only replace the injector on the faulty cylinder.


From the SIB regarding high pressure fuel injector failure