Stumbled across this thread on accident, which is weird given I’ve been living this nightmare for the last 6 months (and last $5k to repair shop and dealer)! Best advice is DON’T USE THE BENT FUEL RAIL! First repair shop did after I asked them to check and replace if necessary. The bent rail kept injector from fully sealing and had “blow by” w the combustion coming back up into the intake area. Happy to send you pics of all the damage….all around inj #6 was charred! I’ll be following as my truck’s still not running right and everyone’s kind of thrown their hands up.
I addition to my multiple posts above:
I can't believe I forgot! 7/8 of my injector seats were filled with crud. Either a mix of sand (that had somehow accumulated in and around the injectors) or with carbon crud deposits.
I ended up spending probably 4 hours over a few days cleaning them. I used the brass brushes from a gun cleaning kit, a LOT of paper towel, and some engine degreaser.
Very vaguely remembering the steps I took:
1. Spray degreaser on a folded up piece of paper towel. Put it on a brass brush sized for a 12 gauge.
2. Violate the injector seat hole, twist a pull a few times. You want to break up some of the grit, but you also want that degreaser to settle on it.
3. Discard the paper towel.
4. Use the brass brush to twist and pull directly in the seat hole.
5. New paper towel (dry or soaked, your choice) use your finger with the towel to try and wipe out the crud.
6. Repeat steps 2 - 5 until you want to move onto a new hole. Remember, the name of the game is to let the degreaser sit. You can come back later.
7. Use a .22 sized brass brush deep into the injector hole, going past the seat. Try and pull the crud that fell into the hole back towards you.
8. Repeat on all the cylinders that need it.
Cleanup:
After each time I did this I vacuumed the intake hole and the injector hole. I tried to use as small of a shop vac nozzle as I could.
Once you're done before you put everything back together: I had the spark plugs out. I formed a piece of copper tube to fit down into the spark plug hole (from the outside of the engine) and I used pressurized air on the other side. Idea being that it is pressurizing the cylinder and hopefully forcing air out of the injector hole.
In reality the compressed air probably didn't do anything to the inside of the cylinder. It DID blow a lot of dirt away from the spark plug hole, so idk maybe it was helpful?