Does anyone know of a video showing the replacement of the fuel injectors for the Stage 2 Tune? The Mike Martin Youtube series shows the Part 1 of the Stage 2 but not the part where he replaces the fuel injectors. I am comfortable with general mechanics but not sure how difficult this will be. Also, it seems like there is a bit of back and forth RPM to get the tune figured out. How difficult is the process overall?
Are you a base model or Redline?
Replacing fuel injectors in the 2.4 is pretty easy. You do need a GM fuel line removal tool (available at any autoparts store) and a few simple tools.
You first depresurize the rail using the schrader (SP?) valve on the rail. This is the nipple that looks like it has a tire valve stem cap on it. This valve works just like a tire stem valve. You take off the cap and push in the stem in the center of the valve with something like a small screwdriver (wear eye protection). Once depresurized, un-plug all four injectors from the harness. They are a two part plug. The first part is a "lock" you have to pull out. It only comes out a little and they don't come out all the way. Once they are unlocked, you then push down on the tab the lock "locks" and pull on the plug. They should come off fairly easy. Now, using the fuel rail tool, disconnect the factory fuel line from the rail. This fitting does have a secure lock on it too but that just comes off by hand. You then have two 10mm bolts that hold the rail to the head. Remove these.
With all this off, the rail with the injectors attached will pull out of the head with a little effort. Be careful though as the injectors actually go into what GM calls injector insulators. These are big plastic pieces with an o-ring on the outside of them. Sometimes they come out with the injectors, sometimes they don't. DON'T lose these! With the rail out, the injectors are held into the rail with some small clips you need to remove. These can be pulled off with a pair of needle nose pliers. Keep these too and note how they go on and their orientation. With those off, the injetors just pull out of the rail.
Reinstallation is the reverse of above but you want to be sure the orings on both ends of the injectors are well lubed before istalling them in the rail or into the insulators. If you had insulators come out. Lube up their oring and reinstall them in the head before reinstalling the rail with the injectors.
Replacing the injectors for the 2.0 turbo car is a different story and, from what I've heard, not as easy. Replacing port injectors isn't hard and isn't propritary to one aftermarket company.