All Things Mk5 > How to Guides / Troubleshooting

2.0 TFSI problems after chain and tensioner change

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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?

Sent from my LG-H955 using Tapatalk

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?

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