Introduction To VAG PD Engine (Pumpe Duse) E-Learning
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- Опубликовано: 10 фев 2025
- VAG PD (Pumpe duse) unit injector system is a high pressure integrated direct fuel injection system for diesel engines, combining the injector nozzle and the injection pump in a single component. The plunger pump used is usually driven by a shared camshaft. In a unit injector, the device is usually lubricated and cooled by the fuel itself.
High pressure injection delivers power and fuel consumption benefits over earlier lower pressure fuel injection by injecting fuel as a larger number of smaller droplets, giving a much higher ratio of surface area to volume. This provides improved vaporization from the surface of the fuel droplets and so more efficient combining of atmospheric oxygen with vaporized fuel, delivering more complete and cleaner combustion.
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Watched a similar training video the other day when my simple Google search to find out what "PD" stood for and where is the high pressure pump located🤔 turned into a rather interesting 1hr long training session. Very clever system.
Was it this video? I've 2 channels but closing the other one down
Same thing just happened to me as well :-)
So happy to have found this video
Thanks, it kept me company and it's good to review topics
Glad it was helpful!
Incredible genius engineering and explanation
nice for sharing great information...cheers from portugal
What I want know is the scrow of a selonoid must be fixed or we can open it and close it to let the injector work good
are pd injector activated on 12v only?
Can’t beat the truth very good.
Very informative mr Steve as always, thanks for sharing , do you know where that one way valve located after fuel filter on BMN engine code please, I have an Audi A3 that hard starting as the fuel keep drawing back to fuel tank . Thanks
you have intank pump on that engine. so i guess you had leaking rubber seals on injecors, that is a common fault for hard start on bmp and bmn engines
Nice one Steve!
Many thanks!
excellent video thanks
Now I know how the injection system works. Internal fuel delivery, high pressure, injection time and fuel return. No wonder the injectors cost $600 - $800
$600-800 if you’re lucky buying used nowadays 😂
INJECTOR LOOM.....BUT....NOT for the reason people think. Read on.
YES, the injector looms inside these engines fail, and a lot of people will tell you it is because it sits in the oil, and this causes breakdown of the insulation over time. This is SORT OF true to a degree, but the following is a LOT more likely to be the cause.
By trade, I'm an Electronics Consultant Engineer, but I'm also pretty good with mechanical stuff, and general electrical stuff too. My '07 Jetta has this problem, so I bought a new loom, installed it, and now it runs on 3 cylinders (rats) so I decided to strip down the OLD genuine VW original loom and rebuild it using military grade wire and terminals. Turns out, you can't do this as the large connector is made of "Unobtainium" or something in that same family, so I opted for a good clean, and to add "potting compound" into the plastic housing to protect the wires.
Fast forward to having done all of that, I reliased I had left the small plastic "hatches" off the injector connectors. I removed them as I was trying to remove the wires to put new spade terminals on them, when I noticed something ODD. Each of them had a fine "film" on them so I measured the resistance (electrical condunctance). Now, there SHOULDN'T be any....But there WAS. so I measured the resistance between each pair of cables in each injector connector. BINGO. 3 were OK, one was giving a reading. WTF?!?
Here's what is happening, WHY, and how to fix it CHEAPLY!
That black crap in your oil, is CARBON (soot). Diesels make a ton of it, and it gets into the oil, where it gets deposited on various parts of the inside of your engine. In case you didn't know, carbon is CONDUCTIVE, not highly like copper wire, but it does conduct and it gets into these connectors where builds up to form a RESISTOR. All this happens over time, a LONG time, but depends on how often you change your oil, if you flush the engine when you do and whether you drive around town or on the open roads.
The power to the PD injectors is around 100 VOLTS at 11 AMPS, and that high voltage is jumping, or arcing, across INSIDE the connectors because the carbon is giving it a "head start", and because these voltage signals are different at idle (less current) the arcing / shorting means that the engine will run lumpy as one or more cylinders arent getting the right amount of fuel. VAGCOM will show the fuel as OK because the ECU is sending the correct signal, but at the other end, this signal isn't powering the injector, it's simply being wasted. To cure the problem do this;
Firstly, remove the LARGE loom connector from the engine. Now, remove the rocker cover of the enginedand CAREFULLY unplug each injector in turn. CAREFULLY remove the small plastic "flap" from the connector and using a SMALL stiff brush and CLEAN, PURE acetone (NOT nail varnish remover) or brake cleaner, clean the inside of the flap, and the plug, until they are SPOTLESS, also, clean the "socket" of each injector until it is spotless.
Using a quality RESISTANCE (Ohm) meter set to the HIGHEST range, measure the resistance between the two terminals of the connector, you shouldn't read anything anything (>20 Mega Ohms) if you do, repeat the cleaning process, remeasure and repeat until OK. When you have done ALL four connectors, re-assemble the engine (rocker cover) using a new rocker cover gasket, re-connect the large loom connector, start the engine and allow it to warm up. If it is now STILL idling lumpy, you have a fault somewhere else, probably an injector breaking down, but this is a cheap, and effective in-situ fix which will save you hours of pain replacing the loom.
Nice info steve 👌🏼
Thanks 👍
Smooth and quiet!?!
Ahhhhahahahaaa.....
There went VW credentials