Join Date: Aug 2000
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So the 258 in my '7 has been ill for some time. The large quantities of blowby in the air filter and smoke coming from the crankcase had me convinced that I most likely had a hole in one of my pistons. I took it to a reputable engine shop for a compression check, and they said that I was okay. They saw a loss of power in the number 5 cylinder, but it wasn't blown. The suggested that my issues were indicitave of a vacuum leak (unfortunately not from any of the hoses) and a valve problem. I'd like to get a few thousand more "reliable" miles out of this engine before swapping in a 4.0. Anyone have any reccomendations for me? How difficult is troubleshooting valve issues? I'm fairly confident in my mechanical abilities as a shadetree mechanic, but have never ventured to engine internals before. Thanks!