All Things Mk5 > How to Guides / Troubleshooting
Loss of power
AlexRennieGti:
Thought I had this issue fixed but not sure if it’s back or this is a different one now. Driving the car yesterday and was running fine then power went very flat as if no boost pressure. The power came back after a minute or 2. Went home all was fine. Came back out this morning car ran ok first 5 min then flat again. Turning the engine off and back on seems too make the power return as if it’s resetting something. Could this be caused by a bad dv ?
Chesto18:
--- Quote from: AlexRennieGti on March 14, 2019, 09:55:52 am ---Thought I had this issue fixed but not sure if it’s back or this is a different one now. Driving the car yesterday and was running fine then power went very flat as if no boost pressure. The power came back after a minute or 2. Went home all was fine. Came back out this morning car ran ok first 5 min then flat again. Turning the engine off and back on seems too make the power return as if it’s resetting something. Could this be caused by a bad dv ?
--- End quote ---
Doesn’t sound like the DV. They tear causing a permanent boost leak. Turning off/on won’t affect it.
TBH it sounds similar to an issue I had with an A3 many years ago and I believe is turbo related. The car would lose power out of nowhere, as if it had lost all boost pressure. A quick turn off and restart and it would be back to normal. No engine fault light either. If so it sounds as if your car is cutting the boost pressure. I’m not sure why this would be, but someone will be along to help. Hopefully it’s just a dodgy sensor somewhere.
dazza:
Sounds like its going into limp mode. My alhambra does this and only restarting the engine resets it. It goes into limp mode to protect the engine. The error i get is turbo overboost.
muff1991:
It might be worth chucking a new crank sensor in.. even if it’s just a Euro car parts one. They’re only £13
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pudding:
Mine's been like that for years. It can be really good for days and really flat and unresponsive for days, but stopping at the shops restores the power again.
No fault codes, everything logged, nothing out of the ordinary. Beats me.
My tuner mentioned years ago he'd upload a map to a customers car, and then a few weeks later they'd ring back saying it's lost all it's performance. He's also mentioned in the past about Revo maps leaving footprints in the ECU you can't get rid of when overwritten with a new map. Maybe there's a correlation there. Either way, the ECU is adapting down. Possibly because the 'driver demand' torque strategy it uses is confused by the requested boost and HPFP numbers of a remap. Not sure!
Welcome to the inconsistent world of VW turbo engines.
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