i have a 89 cherokee and last winter when it got really cold 3 of mine started to leak. I replaced the o rings and they were leaking from the injector so just went and got new ones. But the other 3 are fine this winter and its been pretty cold. So its not hard to pull the injectors its only like 3 bolts so i would try the o ring but like in my case i jsut replaced them all it will do will help your gas mileage with new injectors


Josh Stefani