All Things Mk5 > How to Guides / Troubleshooting
Power loss at speed
robert1:
Hey
I have a small problem with my mark 5 golf GTI (nearly 125,000 miles), not much of an issue at the moment but assuming it'll get worse and it will be a problem on track days. when driving hard, so full throttle, really high revs, it drives perfectly. but as soon as you hit around 125MPH (always just above 120) you lose all power for a few seconds, like you completely lifted off but I'm really still full throttle. it stays like this for a little while, normally until you hit 100 then kicks back in, once was all the way to 80 before coming back. and other than this the car drives perfectly and no lights come on.
using a very cheap scanner I had two faults
00135 - Fuel Rail/System Pressure: Too Low
12599 - intake manifold runner control, basic setting not completed
is there an obvious thing this would be or is there quite a few possible causes?
P.S. yes I do multiple track days a year :P
AJP:
You're getting fuel cuts. Classic symptoms. Your pump can't reach requested pressure, so the ECU basically backs things off until it can build up again.
What hardware and software are you on?
robert1:
its all stock engine wise
AJP:
--- Quote from: robert1 on August 31, 2016, 07:20:11 pm ---its all stock engine wise
--- End quote ---
Stock map?
First thing you should be checking mechanically is the condition of the cam follower. If that's ok it might point to a failing pump. As far as I know the stock map doesn't request anywhere near the limit of the stock pump.
A remap on the other hand could be requesting too much, although unlikely at Stage 1 if it's a reputable map.
robert1:
yes stock map, that's why I wasn't too sure.
might just replace the cam follower, not done it since I owned the car (nearly 30,000 miles) and no idea about previous owners.
I will hopefully be able to report back this weekend, thank you. didn't think about cam follower at all.
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