Injection timing, calculated and actual, looks retarded. Before sending the pump back I would have a look at the tensioner side of things on the pump belt.

 

Thanks Twin Slider,

So you think the timing is retarded? How is the timing calculated? I was thinking it was slightly advanced. As for the tensioner it does fluctuate slightly with the pump running but I assumed this is normal is it not?

 

See next post

 

Please ignore the last post.

I will have to become a member just so I can edit/delete my previous post!

......Your PUMP timing is retarded. Injection is too late!......

The rest still applies. Nearly

As you probably know, the pump can only advance the timing (electronically) If you look at your video, at 48 secs you will see that the pump is advancing the timing when you apply the throttle and it is firing After TDC. Signals from the sensors and 5th injector are then stopping the advanced injection and once it has, the pump appears not to try to advance again, at least not past TDC.

Tensioner can jump about a lot if fuel pressure fluctuates or the belt is too tight. Some fluttering about is normal as long as it within the area of metal tab.

If this were in front of me I would adjust the timing as follows.
To advance pump timing
Lock the pump, preferably at TDC but not essential.
Slacken the tensioner pulley so that the pointer is just above the metal tab with the arrow on it
Apply more tension to the idler pulley so that the pointer and the arrow on the tensioner pulley align

Check timing with VCDS
Sorry for any confusion caused. It's an age thing

 

See......praying that tender can save a LOAD of embrasment jew to typos, and bean able to edit/dilute. T:

I rearely make tyepoes....but when I do...then 10 quid saves my baycon. I:

 

Well Gaz, I am now a fully paid up member.

Typo's I can live with, however, posts that show I am not paying attention or are misleading I would like to edit/delete.

 

Twin Slider,

I'm a bit confused :/

......Your PUMP timing is retarded. Injection is too late!......

Surely if the pump is too far retarded the injection would be too early? Also I thought that the timing should only be setup at idle and anything above the blue line is advanced and below is retarded? I understand the timing should advance with engine revs but not sure why mine does not. As mine is fluctuating above the blue line at idle I would assume my pump timing is too far advanced as the TDI program states this in the lower box?

I tried advancing the timing and it just plots off of the graph as it says it is too advanced. When I rev with the timing advanced more the timing seems to retard if anything. I still don't know why the timing is fluctuating as that doesn't seem correct.

Not sure what you mean here? "Signals from the sensors and 5th injector are then stopping the advanced injection and once it has, the pump appears not to try to advance again, at least not past TDC."

Thanks

 

I'm confused too. It's a good job I do things better than I explain them!

I think your timing is out and the pump is trying to adjust/adapt by electronically advancing. You can check in measuring blocks Group 4 and rev the engine above 2500rpm and see what figures you get.

This is a good example of what should happen https://www.youtube.com/watch?v=0kVZbBjJ2n4

I do not think the timing is the cause of the fluctuation. That could be caused by a number of things. Tensioners, on either belt, Incorrect cam timing, belt too tight.

I have also heard about the woodruff key in the crank sprocket causing wear and causing scatter