Join Date: Jan 2006
Location: central coast, california
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id say there is about a 90% chance the o rings need to be changed on the injectors. The 99's had the old style o rings and they fail easier than the newer ones....and whent he copper crush washers on the tips fail they tend to really reduce fuel milage....Also, the o rings themselves can affect milage if the high pressure oil system isnt functioning to its full capability.....
Honeslty, there is no real diag for this, its just kinda a gut call, but with over 200k, it honestly is more like "maintanence" than it is a repair, so if i was you i would just do it....