Originally Posted by
DmaxMaverick
There's still a lot of factors to consider. It may not be a bad injector. Internal fuel leaks are just as often a broken fuel return line, or leaky banjo seal. You'll have to consider all the factors and decide the best course.
The engine blocks are extremely durable, and I've not heard of any being damaged from (short period) fuel in the crankcase. The rough idle and "miss" is likely due to the crankcase being full of fluid (hard running, with the crank submerged, and little/no air cushion under the pistons). What I suggest, and do, is perform a "sacrificial" oil change, so you can run it long enough to get some diagnostic data before beginning repairs. You can't realistically run it once the tear-down begins, so it's best to do it up front. This will give an opportunity to measure the injector performance, return rates, fuel pressure control, etc., which makes the decisions a little easier once the source of the leak is determined. If you can't do any of that yourself, it'll cost you the dealer's rate for a full diagnostic, but I highly recommend it. It may save you a bunch of cash later. Replacing injectors, assuming they may be bad, is a crap shoot.
As John said, it is almost always best to replace the high pressure injector supply lines. Unless they come out looking pristine, and you have a means of ultra-high level cleaning (ultrasonic, etc.), just replace them and put that worry to bed. There are other sources for new OEM lines (much less than dealer price), so you may want to get a head start on that once it is determined they will come off, before repairs begin. The same applies to other necessary high cost parts that may be needed. You can often save more than 1000 bucks by shopping around, and still have the same parts the dealer will use. Steer clear of aftermarket branded parts. OEM only.