Hello - I recently replaced all five 2" core plugs on my 1997 4.0L Cherokee with brass plugs due to corrosion of the original steel ones. The Cherokee ran great for about two months, and then, under a moment of hard acceleration, one of the new plugs blew out. Fortunately the engine was not damaged, and I again replaced the one that blew. The folks at NAPA said that this can be a common problem when replacing core plugs if the cooling system is not bled properly. My question to you masters out there is this: is this the probable cause, and if so, what is the best way to ensure that this will not occur again? I may have saved $600, but the tow cost $100!
Thank you all so very much!