2.0 TFSI problems after chain and tensioner change

[Nico2904]

Hi

I have just changed chain and tensioner on my Golf V GTI 2.0 TFSI (BWA)
Now I have problems with rough idle (running up and down rpm.)
I get error code P310B/012555 - Low Pressure Fuel regulation: Fuel Pressure Outside Specification

Have searched around online and found various threads of what people have done to resolve this.
So I changed the following without success.

- Fuel Pressure Sensor (G410)
- Low pressure pump in the tank (LPFP)

Are there some who have experienced something similar? Do you have any suggestions?

My next step is the high pressure pump. Will have to get a Loba or APR soon as possible.
Side note: When I drove home after the change of LPFP, I noticed rail pressure was "only" at 110 bar when full throttle, where I previously had about 130 bar. It must also be said that I experience lack of power. Driving with standard HPFP now (which is not optimal, I know)

GTI Specs K03
APR Stage 2 (incl. RFD)
3 " downpipe
Evoms intake
S3 Intercooler

[Patrick2691]

Are you sure the chain is not one tooth out?

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[Nico2904]

I can't see how. Wouldn't it run bad all the time then? It drives fine. Just the idle and a bit lacking of power

[Dan_FR]

Bad idle and lacking power is a classic sign that it's out. Get it on VCDS and you'll know for sure, not just for fault codes but a data logging session looking at both the low and high pressure sides along with the cam timing etc etc.

[Nico2904]

hmm god damn. How do I know where or how the cams should be. The exhaust cam has a hole/dot if if get me. For the adjuster.
Can I use that mark to line up the intake cam?

[Nico2904]

So basically the correct timing is when crankshaft and exhaust cam is on marks (TDC) and the special tool slide right in? If not I adjust the intake cam clockwise with chain off until the tool will slide in (still with crank and exhaust cam on marks?

[Nico2904]

Requested 28 kw. 0 of reguested... so out of timing.
Sorry for being thick, but not sure I understand this. "Some have found that using the inlet cam wrench to turn the inlet cam clockwise to the back of thr engine whilst tightetning the adjuster bolt corrrected their timing, but youll need a spare of hands."

And this: "When I did mine, I looped the chain over the adjuster. Then I basically lined up the pin in the adjustor up with the notch in the shaft, but made sure the pin was slighty higher then the notch but not by much, I then looped the chain over the inlet cam and turned it clockwise to the back.of the engine with the wrench untill the adjuster clicked in."

[rich83]

Take the cam cover off and get some pics of the cams. Photos will massively help people assist here.

Did you mark the cams at TDC?

[dazza]

Mine is 1.5 each way of the requested on an AXX is this correct?

[Nico2904]

Ok thanks mate  No I didn't mark cams on tdc :(

[Nico2904]

Just finished it working on that chain and tensioner and all timed and working perfectly. Had VCDS on and it shows 28 KW of 28 KW requested  Can finally sleep again hahaa

[rich83]

Good job! 

[Nico2904]

Thanks guys for inputs  It is quite tricky with the cam tool, get it to slide nice and easy in.
But for anyone who doing this, follow these advises:

- make sure engine is on marks
- Do not force locking tool between cams. Should slide nice and easy in
- When putting adjuster, chain and so on back together, make sure everything sits correct. Check by crank engine by hand (several times to be sure)
- I found that the chain should be a bit loose at the bottom (opposite of the actual tension of the tensioner), when it all sat correctly
- Check marks on engine and exhaust cam

Thank you
- Nico
 

[Pesky jones]

Well done pleased you got it sorted