hi, Quick review, 95 M-Ed. JR/SC and motor bored 10 over all rebuilt <2k miles ago. Note I did not build the reciprocating mass
Since some sort of rodent had nested in the intake of the replacement block/head i have and some of the intake valves were open, i decided it was best to pull the head and ensure that the cylinders were devoid of debris. further, as long as the "new" head was coming off, i decided to re-use the rebuild head from the "old" motor. upon ,removing the "old" head, i inspected the the "old" pistons and cylinders. I am far from a mechanic as i learn by going things in a roat (sp?) manner, (note the oil pump :). so this is getting into areas I do not know well. However, I saw lines along the vertical of the cylinders which seemed OK, but the walls feel like there are many small angles rather than beening perfectly round. Moving forward, I see he cut outs for the intake valves looked odd but pretty much the same...then i noticed what looked like impact damage on one piston. looking more closely, the intake cutouts were indeed burned out sections of all the pistons such that I can see the top ring, (the oil sealing ring, right?)!!! (SideBar: that is why I could not determine why I was having difficulty doing a leak down test, i could hear hissing but could not isolate where the air was escaping from without a proper listening device). Something new I learned. Determining cause of failure like this is where I an greatly deficient in knowledge. I believe burning the pistons is due to a lean condition, but I do not know why the AF mix was lean...isn't that taken care of via the ECU?, If so, how can I determine if mine is functioning correctly? If not how do i set the mix correctly? I hope to get a real mechanic over to inspect/advise me later today.... sigh, peter -- Medio tutissmus ibis You will go most safely by the middle course
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