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
ricatic wrote:
It appears that the common rail systems that operate at significantly lower pressure are not having the problem. Dodge uses the Bosch CP3 series pump. IIRC, it operates at 1600BAR. IIRC, GM used the CP3 series pump until 2011. CP3 series pumps have an excellent track record. Is it coincidence that the 2012 VW diesels have dialed back the internal pressure from 2000BAR to 1600BAR? Not likely when they have been seeing these failures for 5 years...and they warranty their repairs.
Just a note from the free lunch department...
It is not just lower pressures, but a different, more complex, and expensive to build pump (CP3).
The CP4 was touted as cheaper to build, and yet did higher pressures.
Retrofitting CP3 is not an option for the manufacturer or individual users.
For one, emissions certification will have to be done from scratch, and it is not clear that the older pump can be used with the newer injectors.
Dropping the pressure on the CP4 is a stopgap --- and if the problem is reactivity --- then it might help.
If the problem is intolerance of common lubricant additives, the problem remains.
VW is basically trying to contain the problem in what is a very small part of their business that is costing them an arm and a leg.
