Quote:
Originally Posted by William930t
The supplier bought the raw materials and made it to Ford specifications. However, the Ford engineers created the specs that the suppliers followed. Ford then did real world testing before going into production.
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We have no idea if the supplier made it to spec, and we have no idea if only a small percentage were not in spec. It is entirely possible the valve manufacturer was sold some non-spec material that was not caught. It is possible there is a design flaw. We know nothing about the cause, only the result.
Just like the IMS, pre-testing, simulation, dyno-testing, etc., cannot duplicate millions of real miles.