Join Date: Jun 2008
Location: Kent, WA
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It is possible to do internal damage if you fail to purge the cylinders after an injector swap. The possible damage is due to hydrolocking and its an insane amount of pressure. That being said, it is very difficult to diagnose something like that over the phone and most likely your truck would not be running right now.
As far as replacing single injectors goes, you can change individual injectors that are failing. However, if they are all getting weak, it is a good idea to bite the bullet and get a fresh set. The other ones are most likely nearing failure as well. As mentioned above, it is one injector directly feeding one cylinder.
Given the knowledge level you have expressed about the engine in your truck, you should probobly find a reputable mechanic that you can trust. Or if you have the time and are mechanically inclined, work with some of the trustable mechanics on this site that willing to step you through the problem.
Early '99 F-350
- AFE Stage II Intake
- 4" MBRP Stainless Exhaust
- Banks Big Head Wastegate Actuator
- DP Tuner (stock, 40 tow, 60 econ, 80 econ, 120 race)
- Adrenaline HPOP
- Swamps Stage I Injectors
- South Bend Organic Single Plate Clutch