Peter- It sounds like either not enough fuel or too much ignition advance. You definitely need to get this sorted out. What engine management do you have on the car? Does it have something to increase fuel and retard timing?
-Chuck pm wrote: > 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 > ------------------------------------------------------------------------ > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
