Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
NinerBikes wrote:
Some reading, while not Ford, it is all Bosch Family CP4 family pump related.
This is NOT about the brand or badge on the vehicle, keep an open mind, it's about Bosch HPFP failures. Something I was unable to get across to some fanboys and Mods over at FTE before the last straw.
Failures by state, or province, in North America.
From the outset, once the NHTSA filings were made public, it was clear that it is not about the badge.
It is about CP4 in North American applications, (possibly less in Canada, thought that is uncertain).
Need a stats person to see if the delta between US and Canadian rates are statistically significant.
When every implementation is a problem, whether it is single piston or dual piston, 4, 6, 8 injectors, with totally different configurations of piping / accumulator-common rails, different injectors, piping to injectors...
It tends to put theories that are specific to one brand-implementation like the 6.7 aside.
I tend to not think it is Injector-common rail-piping related (too small a effect, 3rd order engineering even after factoring in standing waves, resonance).
Then what about common rail-piping-pump?
That can be 1st or 2nd order.
Need to know if the common rail part is identical in VW vs. Ford 6.7 vs. GM... if it is.. that is a useful lead to not rule it out.
Even if piping from pump t common rail is different length, it can transmit a standing / shock wave.
Then we are back to the pump, need to know is it the bore that failed first, or the cam lobe / piston interface.
What a story...
