Quote:
Originally Posted by Salzamani
Hello again!
Just to give you an update. I replaced only one leaky cylinder 1 injector over 2 months ago. It’s solved my rough idle issues and improved my fuel economy about 10%. My N54 fires up faster than ever not that it ever had an issue. The spark plug now looks dry and clean. I put in an index 12 and coded it using INPA. All of my other 5 injectors are index1’s. The car pulls normal and you would never know that I have mixed injectors because it runs absolutely perfect. Just do it!
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Just want to say Thank You to the OP and others on this thread. Gave me the confidence to purchase a "rebuilt" Index 12 injector from recommended eBay seller and install it in (misfiring) Cyl 5 of my '08 335i with 144k miles (coded it using INPA, another thank you to e90post). Solved my misfire, rough start, and rough idle immediately.
I got a walnut blast last July and recently had both low P and high P fuel sensors replaced, as well as downstream O2 sensors on both banks. All that helped, but replacing that leaky injector was final piece of the puzzle.