Hello.

 

I'm new here and would like to ask if anyone has had a similar problem with a 2018 Superb MK3 2.0tdi Euro 6  (DFGA engine code with AdBlue system). 

 

Sudden reduction of power and torque between 1500-2000rpm from one day to the next whilst towing a caravan.

 

Also when not towing I've noticed light throttle pedal action is less responsive between 1500-2000rpm and the mpg seems to also have been affected.

If you boot the car over 2000rpm it goes like a rocket.

It's done 30,000 miles from new.

 

Further points are I've always used premium diesel such as Shell V power since new and had annual service/inspections done because most of my mileage involves motorway towing  which means lumbering along at 55-60mph in 5th and 6th gear below 2000rpm.

 

There's no warning lights displayed and I've check the rubber pipes from the turbo regulator to the control valve and EGR as I've had damage from pine martens chewing them through in the past, but that normally brings the warning light on immediately.

 

Not yet had a chance to check for DTC.

 

Would be grateful to hear any suggestions and possible clues as to how to reinstate the performance, it normally pulls like a train when towing.

 

 

regards

 

Skoti  

 

 

 

 

 

 

 

 

 

 

 

 

After watching a clip on SCR cleaning I'm starting to get a bit concerned about the VAG Euro 6 motors and the possible cause of my Superb power loss.

 

For those of you technically minded here's the clip:-  

    From approx 5 mins in you can see the effects of AdBlue crystallization on the particulate filter, no amount of regens can prevent this happening....

 

 

Happy Sunday

 

Skoti

 

 

   

Update.

 

Well I'm just back from a visit to the main dealers with my Superb 2.0tdi 150 that has a power loss below 2000rpm and fuel consumption issue.

 

They plugged in and detected no DTC's.

 

I'm told  there's nowt wrong with the performance and the fuel consumptions issues are due to the winter tyres I'm running.

Anyhow If I'm not happy I've too keep running it until the eml comes on and then they will have another look.

 

I asked them if they could check the DPF and EGR for blockage and was told this was a big job that would take all day and they would have to borrow special equipment from the mother dealership...

 

Seems like they are not interested unless they can detect a DTC or have a service bulletin with the answer to the problem addressed.

 

Going to have to find an independent specialist to have a proper look, so much for main stealers!

 

 

   

Further update.

 

Just back from a thrash on the German autobahn where I filled up with premium plus diesel and chucked in a can of BG245.

Managed to hold 110mph flat out in 4th gear for a few miles on a long uphill stretch, motor seems a bit more sprightly now but not solved my power loss under 2000rpm.

 

But what I have discovered is that after parking for maybe 30 minutes and letting the engine cool off a wee bit,  I then find when pulling away again normal power under 2000rpm comes back for a short spell until the engine heats up properly again.

 

I wonder if any one else has experienced this or can explain it?

 

 

I'm not sure if your engine has VVT...........but if it does, do a bit of research on the actuator that controls the VVT system.

Yes,

 

I'm sure it's the usual VAG variable vane turbo system fitted to the EA288 engines.

Thanks for the actuator tip, please will  you direct me to the relevant article? 

 

 

I've been sorta thinking the problem I'm experiencing may be due to insufficient boost pressure below 2000rpm.

Maybe I should have the actuator and turbo control valve duty cycle checked and compared with the requested amount from the ECU below 2000rpm?

 

Without any recorded DTC I'm still in the dark with this problem and open to any suggestions.  

 

 

 

Also from past experience with my old PDI Skoda I know slight vacuum leakage can cause boost pressure problems so I've been over the small rubber pipes time again checking for the usual pine martin bite marks, they have teeth like needles. 

 

 

 

   

1 hour ago, Skoti said:

 

 

 

Also from past experience with my old PDI Skoda I know slight vacuum leakage can cause boost pressure problems so I've been over the small rubber pipes time again checking for the usual pine martin bite marks, they have teeth like needles. 

 

 

   

 

Yup - I remember that with my old pd Superb back in the day - when it sprang a vacuum leak all power vanished under 2000rpm. After a while it also put it into limp home mode on long journeys though.

 

On 17/12/2021 at 21:01, Skoti said:

Yes,

 

I'm sure it's the usual VAG variable vane turbo system fitted to the EA288 engines.

Thanks for the actuator tip, please will  you direct me to the relevant article? 

 

 

I've been sorta thinking the problem I'm experiencing may be due to insufficient boost pressure below 2000rpm.

Maybe I should have the actuator and turbo control valve duty cycle checked and compared with the requested amount from the ECU below 2000rpm?

 

Without any recorded DTC I'm still in the dark with this problem and open to any suggestions.  

 

 

 

Also from past experience with my old PDI Skoda I know slight vacuum leakage can cause boost pressure problems so I've been over the small rubber pipes time again checking for the usual pine martin bite marks, they have teeth like needles. 

 

 

 

   

No, I don't mean VNT .......I mean Variable Valve Timing.....to seperate sets of lobes on the cam and an actuator moves the cam to have timing to suit the power demand.

This actuator can stick/fail and basically leave the car timed wrong. The engine could be stuck in a "high lift" setting...... so that's why it performs well when it comes on boost but you have a very lazy throttle performance in the low rev range.

 

Some of the VW engines have this system and they do give trouble.

Hi,

 

thanks for correcting my confused terminology.

 

What you say sounds exactly like the problem I'm experiencing. 

But as my engine code is DFGA (EU6) and was built in May 2018, it has no VVT system fitted as far as I can see. 

 

Back to the drawing board for now, but also still open to further suggestions please...

On 19/12/2021 at 20:26, Skoti said:

Hi,

 

thanks for correcting my confused terminology.

 

What you say sounds exactly like the problem I'm experiencing. 

But as my engine code is DFGA (EU6) and was built in May 2018, it has no VVT system fitted as far as I can see. 

 

Back to the drawing board for now, but also still open to further suggestions please...

I have also read that the throttle pedal can loose it's calibration and not show up a fault code.

Thanks for the throttle box tip.

 

 

 

I've had a google around to try and investigate this.

 

Thought about trying the Pedalbox+ module for about 200 quid but I'm hesitant to do so as my throttle and power response below 2000rpm is perfect when pulling away after the car is parked for 30 mins and has cooled off a wee bit.

But when warmed up again it's goes back to it's non-responsive mode.

 

When the car was new the throttle response was also quite laggy but after the first thousand miles it sharpened up, presumably because the engine had loosened off.

 

 

Just to recap - on a 600 miles autobahn trip with my caravan in tow the car was pulling like train as usual, then the next day when I set off again it struggled to pull below 2000rpm without constant gear changing and extra throttle, Been checked by local main stealer, no DTC present and all is in order according to them.

 

Ever since It's just not had the same drivability as before, normally it would accelerate up some of the hills around here in 5th gear from 1600rpm with just a light touch of the throttle pedal.

The engine now feels more lumpy below 2000rpm and the fuel consumption is roughly averaging 10 mpg extra.

 

 

More suggestions welcomed...

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

  

 

 

 

Happy new year to all.

 

 

Just wondering if anyone on here has used Quantum Tuning ?

 

They offer this:-

 

"Chip tuning Quantum Green Economy is a special version of the engine control software for Skoda vehicles.

The engine maps for the 110 KW engine are adjusted by raising the torque at low speed.

It is therefore not a classic ECU remap for Skoda vehicles, all optimizations are made to minimize consumption while maintaining driving dynamics".

 

Probably might not get to the bottom of my power loss problem but perhaps may improve matters.

 

 

I'm planning to visit their place next week to have my stop/start deactivated and suss out their workshop set up etc.  

 

 

Edited 1 January, 20224 yr by Skoti

You will find threads / posts on Quantum Remaps on Briskoda and elsewhere on the net.

 

Only go to have a remap from Quantum or APR or REVO or anyone with a car running as best as it should.

Do not remap engines with faults or issues.

If the OEM map is wrong get that sorted have a car running right with no warranty or a warranty before ending up with something that cost you thousands and might cost you thousands more and be un-usable.

 

So if the Remap Franchise people are proper Motor Engineers / Mechanics and they can not fix your car to run properly before remapping 

they really should not be trusted to do a remap.

 

Hello Roottoot,

 

 

thanks for your advice, I won't remap now. 

 

Instead I've found a local independent place that has a dyno and may be able to simulate and diagnose my power loss problem below 2000rpm when towing.

If successfully repaired I'll post the conclusion for general interest. 

 

In an earlier post I mentioned the car went fine for a few miles after being parked up for 30 minutes or so.

I'm led to believe this is due to a cooler more dense intake charge which apparently benefits combustion and performance, but then as the engine warms up heat transfer warms the intake air again.

I sort of remember this experience back in the 70's from my little Yamaha two stroke bike that used to always go like the clappers on a cool summers night... 

 

Be interesting to hear anyone else's take on this?

 

 

 

 

  

 

  

 

 

Just here to say "me too", but across the brand divide.  I have a manual 2018 Passat with the DFGA which seems to have developed the exact same issue. I too have seen the sudden onset (no caravans involved in my case though!), occasional returns of power (though I can't trigger it as reliably as you with the "warm start" trick), and roughly 15% increase in fuel use. No DTCs. No obvious problems above 2000rpm.

 

I'll update if I work anything out.

On 02/01/2022 at 12:20, Skoti said:

Hello Roottoot,

 

 

thanks for your advice, I won't remap now. 

 

Instead I've found a local independent place that has a dyno and may be able to simulate and diagnose my power loss problem below 2000rpm when towing.

If successfully repaired I'll post the conclusion for general interest. 

 

In an earlier post I mentioned the car went fine for a few miles after being parked up for 30 minutes or so.

I'm led to believe this is due to a cooler more dense intake charge which apparently benefits combustion and performance, but then as the engine warms up heat transfer warms the intake air again.

I sort of remember this experience back in the 70's from my little Yamaha two stroke bike that used to always go like the clappers on a cool summers night... 

 

Be interesting to hear anyone else's take on this?

 

 

 

 

  

 

  

 

 

 

Hi Scoti.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I have the same car with you with 135000miles on clock and I experienced exactly the same problem with you as you describe it for almost a year now.

 

I visit few different garages without results.

I replace EGR valve, dpf, clean the turbo.

The problem still there..

I spend alot of money allready and I don't know what else I can do...

Did you find any solution ?

I will aprisiate your help if you answer me.

Thank you.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I