Quote:
Originally Posted by v8volvo
In truth I have never known this to happen on any VE pump EXCEPT in TDI engines where for some reason it happens all the time.
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Yes agree, not likely unless the pin has been tapped down a bit too far by someone attempting to adjust.
There is experiential evidence that indicates the dynamic timing action weakens over time (internal vane pump wear, general wear, lower modern ULSD viscosity) and therefore, older IPs need Pressure Control Valve recalibration to restore the desired dynamic timing action.
In addition to plumbing in a pressure gauge, one can measure the fuel output quantity from the IP OUT bolt at specific RPMs over time. Careful not to confuse IP RPMs with engine RPMs.
Plenty of interesting reading here:
internal injection pump pressure
Sorry for hijacking this thread. If we continue this topic we should start a new one.