Audi B8 S4 3.0T TFSI Fuel Injector Service 

Clean or replace: is the choice clear?

For years, I have been sending injectors out to be cleaned and tested. Why? Injectors are expensive, and in my humble experience, I haven’t encountered many failures. They are a simple but nifty part whose sole job is to squirt fuel into the combustion chamber. Now, it likely is just the injectors I have used (I know BMW injectors can be a little prone to failure), but in this video, I apply what I have always done… well, almost!”

Cheap fuel injector cleaners on Amazon: Are they worth it? Maybe.

I know, I know, that sounds like a cop-out. The ones I purchased and tested worked fine for 12V, but check out the video to see how they fared with 70V, 70PSI Audi injectors. Now, I did get some results, but they were not what I expected. You’ll have to watch the video to find out if I kept the machine, but it’s best to decide for yourself how useful it is. Oh, and stick around, because in the future, I have an idea on how to drastically change things!”

Resealing Audi B8 S4 V6 3.0T TFSI Injectors

It requires a special tool (details in the video), but I do show you every aspect of how to replace the combustion seal, fuel rail seals, and retaining rings on these injectors. It’s a little time-consuming but well worth doing. Oh, and remember, the combustion seal must be installed dry and free from grease!

Check out the video for all the details on the Audi B8 S4 fuel injectors. 

Video: My Audi S4 B8 Injectors were worse than I thought. Reuse them or buy new? What would you do?