Hi All,
I think it would be real nice to have a list of these external  factors,
that installers, wether professionals or self installers
could go through, to check & recheck.
To remove as many variables as possible,  to ruining a perfectly good  engine,
just because of a bad injector, or air bubble or such.
JC...

There are many external
factors that can cause an engine to fail. As  some of us know from
experience, it may only take overheating the van one  time to blow a head
gasket or worse. (That is why I needed an AVP engine in  the first place!)
Before blaming faulty workmanship for an engine problem,  you must rule out
the multitude of external factors that may have caused such  a failure. This
is completely impossible if you did not even own the van at  the time!