Injection Pump Question -- Little Flapper Arm is Stuck

[MKIV_TDI]

Hi all, I've had a few Injection Quantity codes come up via VAGCOM, and now the car won't even turn over and idle.
I took the cover off of my injection pump, and I noticed that the little "flapper arm" (somebody please let me know what the right name is) doesn't move well at all. It takes a lot of force to move it a millimeter or two, and it doesn't spring back.

Thoughts on my options? Can I fix this? I'm not too knowledgeable on the workings of this, but I'd love to give it a shot.

Thanks!

 

[KLXD]

That's the Quantity Adjuster. It sets the amount of fuel the pump injects. Does it feel like it's rubbing or just tight?

At this point you may as well remove the other three bolts and see if it's the QA hanging up or the collar it moves on the pump plunger.

There are threads on opening the QA up for cleaning. Involves breaking the welded connections that are hidden in that pic by the wrench and thumb.

 

[MKIV_TDI]

It's very, very tight. I have two other engines laying around and each of their quantity adjusters move very freely and spring right back into position.

I'll do more digging around!

 

[KLXD]

If you have VCDS and a seal kit you might be able to swap the QA.

 

[MKIV_TDI]

So digging a bit further... this shaft turns very, very hard.

It's an 11mm pump. The engine was an auto.

 

[edjet]

https://youtu.be/DdQbrdv78A4
This video shows the area you need to inspect. Before taking it loose, make scribe marks on the cases to get everything put back in the right place.

How did you separate the connections on the wiring block?

 

[KLXD]

So you removed it from the pump or just removed the guts of the QA? can't tell from the pic.

You need to pull it off the pump to see if it's the QA shaft or the collar in the pump that's binding. Must likely the QA.