I wonder whether somebody could give me some advice,

 

I have a 2008 Octavia 1.9tdi, and have just changed the timing belt / water pump etc. The engine was running fine before I did the work. I used a timing lock kit, but as a precaution, made some marks with tippex on the belt and sprockets. Everything seemed fine, and nothing seemed tight when I turned the engine over by hand  a few times (socket on crankshaft bolt). 

 

I didn't take the fuel filter off, but merely undid some of the smaller pipes, and folded it out of the way onto the top of the bulkhead and it was on it's side. 

 

When I started the engine, it ran fine with no load, and I ran it up to temperature at various engine revs and it was running sweetly. However, as I drove it up the road, it immediately started missing, and then surging under load. It was lumpy. I ran it for a couple of miles not exceeding 30mph. I was fairly confident that the timing setting was correct. Could the problem be that I have disturbed dirt in the fuel filter, and that would cause similar problems?

 

Would there be similar problems if I had got the timing out somehow?

 

I would be grateful for the advice.

 

Many thanks,

That engine is very sensitive to tiny changes in cam timing, after the belt is replaced the VCDS procedure whose name escapes me (like all of them it bares no resemblance to the parameter) needs to be run and then the tiny adjustment made to the vernier pulley.

 

Be aware that it only measures up to +/- 4° or something before showing a zero value which will make you think it is spot on but it is in fact outside of limits, the engine will run out of limits but behave like yours.

 

The name will come to me soon,  something like torsion angle.

 

Torsion value - https://www.myturbodiesel.com/threads/pd-engine-torsion-value-solid-information-about-why-and-how-to-optimize.35386/

Edited 7 December, 20205 yr by J.R.

Thanks for the advice. I hadn't heard of the torsion value and so the thread was interesting By way of an update, I have had a decent look in daylight, and I noticed that the intercooler charge air pipe had not clicked back into place properly. I now seems to be running fine, but the link does make me think that maybe I should get it checked at some point by VCDS.