All Things Mk5 > How to Guides / Troubleshooting
Loss of power
AlexRennieGti:
Hi guys looking for some help with a weird fault.
I have a mk5 gti with 2.0tfsi engine. I was driving along motorway yesterday and car lost power. Engine won’t rev passed 4000 rpm. Car struggles too pull to any speed. Also car struggles too start. Had a garage scan it today no fault codes showing up at all.
Any suggestions what I should look at next ?
Thanks
muff1991:
Are you only having trouble starting in the colder weather? I’m having power cuts at 4K too and also cold start issues, when freezing it starts but cuts out, when milder it starts but laggy throttle.
@pudding has been helping me out with this issue, and I think it’s come to the conclusion it could be fuel cuts (maybe a tired hpfp) and an air leak or some other electrical issue for the cold starts. I also have no codes flagging up! But issue sounds very similar... let me know if you find a fix, and/or I’ll let you know too!
Sent from my iPhone using Tapatalk
pudding:
High pressure fuel pump I reckon. You won't always get a fault code for that unless it fails to meet the required pressure for a set period / rpm window. But that's what a lot of garages do isn't it. No codes, send you on your way. Was deeper analysis not offered? Such as a road test with sensor logging?
Critical sensors like cam, crank, throttle and pedal are fault coded. Emissions related faults such as lambda, cat efficiency etc throw a CEL. There are a lot of items that aren't fault coded, so more investigation is required.
AlexRennieGti:
I have replaced my Hpfp and have regained most of my power but now if I push the car at 90-100mph the power is dropping away again. Put foot down and nothing. Think maybe need upgraded Hpfp as standard one not supplying enough fuel.
Thoughts?
pudding:
It won't hurt to add VIS internals but if it's standard, it shouldn't be doing that. Time for some data logging of the boost and fuel rail channels I think.
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