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...
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NewsW wrote:NinerBikes wrote:
Then the sensor on the rail tells the EDM insufficient fuel prssure, and the car goes into "limp " mode.
Other scenario is that the sieve like filter at the pressure sensor at the HPFP gets so loaded up with swarf, that it overloads with pressure to the return line, that the return line never sees, possibly over stressing the pumps guts, piston, plunger, cam, bore, roller, etc. if that fuel can't get out or get back to the tank, where does it go, where does it get absorbed or bled off to?
Keep pushing.
Ask.. what if the sensor fails?
Read too high, too low?
How are the sensors calibrated?
How do the modulators function?
Is it "on or off" or is it proportional?
If it is a proportional valve, then how is it calibrated?
We need to put a "spy" on those two modulators and sensors to know what it sees and how it behaves... according to the ECM.
I seriously wonder if you could log the pressures the sensors see with VAGCOM /VCDS software and a cable.... I am almost certain that you can do so.... Seriously, my buddy was doing so on my passat about a week ago, while I was driving, had it hooked up to the OBD II port, I know for fact we saw 2500 millebars pressure, absolute, requested, and very close, 2450, actual, delivered at 1700 rpms with the VNT turbo on my 2012 passat... that's 22 to 23 pounds of boost, which is insane, to the edge of stalling the turbocharger to the point of causing fluttering and causing what is known as turbo surge.
One thing I know for certain, Bosch's QC on sensors is, has been, and probably always will be crap... Their MAF's were failing all the time on North American ALH motored cars from 1998 to 2003.
If these pressure sensors and the quality control exercised on them are******also, and Chineseium... they very well could be causing these HPFP's to go Ka Boom! also. This isn't air pressure, it's hydraulic pressure, at astronomical numbers. Also the reaction time of these sensors is highly critical also, lift off the pedal at high rpms after a full throttle application, and where does all that fuel flowing and fuel pressure go to be either bled off or reduced in time, before the pump grenades from the change in routing of the fuel inside it from fuel rail to bleed off to return line for the fuel tank?
