F-150 4.6 liter

burning a hole in the piston ? the form Mechanic said that

they are the correct ones for that truck according to

problem be with the injector ? making it run lean and

The engine does not have any problems commonly "known" to cause burned pistons. A lean mixture from a dirty injector or an leaky intake gasket or, the wrong heat range plugs may cause this. Also, it it possible that you are losing coolant. Have you checked the EGR system or, have you been noticing any unusual ping under load. This can burn a piston in only a few minutes. Then, there is the statistical certainty that one will fail if you make enough of them and you just happen to have it at the time.

shows the same plug that I installed

cars and truck for the last 20 + years ...regardless

AC/Delco works great in GM products. The only plugs known to be correct for Ford products are the Motorcraft brand. I have had good results with Autolite. I know of no scientific evidence that one pug will work any better than another but, my own experience is that the OEM plugs are the only safe, reliable & predictable choice in a non-modified engine. Some engines are so close on specifications that the tolerance in heat range variation may be just enough to put one over the top.

I no longer use Champions in anything including my lawn mower.

melt out a piston ??????

burning a hole in the piston ? the form

I'm struggling to remember where, but I swear I've heard of this problem before, possibly on this group a year back or so. If I remember I'll post it here.

Sean

thanks Sean and lugnut

burning a hole in the piston ? the form

I'm struggling to remember where, but I swear I've heard of this problem before, possibly on this group a year back or so. If I remember I'll post it here.

Sean