All Things Mk5 > How to Guides / Troubleshooting

Loss of power

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AlexRennieGti:
There are times the power kicks back in itself. Its not showing up any faults either.

AlexRennieGti:

--- Quote from: Pudding on March 14, 2019, 02:33:33 pm ---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.

--- End quote ---


Your right it can have days even weeks of running perfect and then boom no power

pudding:
With my ED30, it feels like all the power moves to the top end.  On a good day there's responsive torque everywhere, even off boost.  On a bad day, it can't pull the skin off a rice pudding below 3000rpm and feels really heavy and reluctant to get moving.

I've checked everything.  Binding brakes, flat tyres, boost leaks, PCV, DV, data logging.....everything.   

A new ECU that's never been flashed is my next port of call, but the faff of coding my key to it is putting me off.

One thing I and Muff1991 have noticed is the performance improves as the weather gets warmer!  Should be the other way round with turbo engines  :grin:

AlexRennieGti:
Well guys driving home from work and power goes flat again. If I press accelerator on and off a few times power comes back briefly then disappears again.

Feel like just finding a big wall and crashing into it 😂😂

muff1991:
Alexrennie... is your car going flat at a certain point (rpm)? are you describing flat spots when pressing on or car just feels dead and laggy?

As pudding said, I have been chasing an issue with mine since November time! But unfortunately it’s only weather related so really hard to have the weather on a day and convenient time I can diagnose.

Mine started here:
We had a low (above freezing) morning and I started the car... idle dropped a lot quicker than normal.. and as I throttled to go I noticed the throttle was LAAGGGYY as hell.
Might be worth reading my cost start issue post for full detail.
But it was basically laggy up to 2k rpm and above seemed more normal.
Then even know engines fully up to temp, the car still drove like this!
When I booted it... it would reach 4K rpm and litterally CUT the power as if someone turned the boost off!! The DV psshhh can be heard and although I keep it pinned it can take a good few seconds which feel forever and then the power kicks back in like someone’s just give back all the boost it’s lost  ALL in one go!

After all that above started I noticed this...
As soon as the outside temperature is below 0 degrees the car starts on the button and the revs just die down and cuts out! Start it back up.. dies!
Even tried throttling to keep the engine running... but the pedal didn’t do NOTHING! Beats me mate! Done Throttle body, all the usual stuff.. logged all I know. And still no where!

My little experiment:
I took the ECU out the car today and wacked it in the freezer for 5 hours, plugged it back into the car and started it.. didn’t make any difference! I thought by freezing it would create below 0 for the ECU so that eliminates my theory of the ECU playing up when freezing! It’s something telling the ECU to draw back or the ecu is faulty and/or it’s the software!

I am going to send my ECU off to be tested and then if no difference I’ll be having a standard map put back on the car! Or as per puddings idea, grab a second hand ECU but will need to speak to some matey that has access to the Immobilizer, key coding and all that rubbish.

Throw around any ideas or more info. We gotta get to the bottom of all this! I’m certain your problem is the same if not very similar and on the same lines as mine!





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