My 2009 2.0tdi 170bhp has become very sluggish at setting off. when setting off the car crawls then gets a sudden jolt of power causing wheel spin, I'm well aware of turbo lag but this seems abnormal. I'm not putting my foot down hard either, just very gingerly. The car responds well when in other gears. Iv'e noticed the economy has dropped too. 

 

I was thinking of changing the front tyres and getting a service soon, Is there anything else that could hamper the acceleration?  

As per your other xenon headlight post a scan of the car could generate a fault code which will aid diagnosis.

 

Any on-dash warnings, EML (Engine Management Light), flashing coil, DPF (Diesel Particulate Filter) light etc?

 

Slow or poor pick-up is likely to be fuel or turbo related. Sticky turbo vanes usually result in the EML.

 

Where are you having the service done? Ask if they have VCDS or VAG-COM (if not a franchised Skoda main dealer) so that they can properly read the codes for you whilst its in.

 

I'm guessing the car is predominantly used for short low speed journey's (sorry, never been to Jersey but I've heard there aren't many roads?), the DPF and EGR (Exhaust Gas Re-circulation) valve don't like repeated short journey's, regular higher speeds / loads are needed to keep them clear of carbon and soot deposits. As they coke up the car can become less smooth to drive, but again sooner or later you'll see the EML or the car will drop into limp-home mode.

 

Edited 8 January, 20188 yr by silver1011

Also - the variable vanes in the turbo could be gummed up (these help give a linear power delivery)

Ok I will post OBD results later.

 

I have a feeling its turbo related. Iv'e not long cleared the DPF filter. Could do with blanking the DPF because of I only do short journeys. 

5 hours ago, Vanders said:

Ok I will post OBD results later.

 

I have a feeling its turbo related. Iv'e not long cleared the DPF filter. Could do with blanking the DPF because of I only do short journeys. 

What do you mean when you say the DPF has been blanked?

 

The behaviour you describe sounds like the guide vanes in the turbo are sooted up and sticking a bit before breaking free, hence the sudden return of normal performance. This is something that happens to cars that are driven too gently: the soot accumulates in the turbine housing and the low exhaust flow from gentle driving is not enough to clear it out and down the exhaust.

 

Alternatively it could be problems with the vacuum system, maybe leaking lines or a failing N75 valve. Proper diagnostics with VCDS or something similar that's capable of reading VAG protocols will tell more. A scan with a generic OBD tool is unlikely to reveal much.

 

I'd suggest logging MAP (boost) requested vs MAP actual while driving to start with, along with N75 duty cycle, VNT position (if fitted - I can't remember if the turbo on these cars has a position sensor for the VNT actuator).

You can't blank the DPF as that is the exhaust, you can have it removed however this is now illegal, I think you mean  the EGR. If you check you fault codes with a reader you might see turbo over boost which will tell you your vanes in the turbo are jammed

List of faults

 

OBDeleven data log

Date: 2018-01-09 15:26

    VIN: TMBBF73T999017636
    Car: Skoda Superb
    Year: 2009
    Body type: Saloon
    Engine: CBBB 125 kW (170 HP) 2 l
    Mileage: 84900 KM

---------------------------------------------------------------
16 Steering Column Electronics

    System description: J0527           055
    Software number: 1K0953549CD
    Software version: 0111
    Hardware number: 1K0953549CD
    Coding: 0001731

    Subsystems: 
        System description: E221__MFL-URO   H07
        Software number: 3T0959537
        Software version: 0011
        Coding: 0000130

    Trouble codes: 
        00576 - Terminal 15 Electrical malfunction in circuit
            Intermittent
        00883 - Ignition/starter switch (terminal S) Electrical malfunction in circuit
            Intermittent
        00884 - Ignition/starter switch (terminal X) Electrical malfunction in circuit
            Intermittent
        01744 - Ignition/Starter Switch D (terminal P) Electrical malfunction in circuit
            Intermittent

 

OBDeleven data log

Date: 2018-01-09 15:25

    VIN: TMBBF73T999017636
    Car: Skoda Superb
    Year: 2009
    Body type: Saloon
    Engine: CBBB 125 kW (170 HP) 2 l
    Mileage: 84900 KM

---------------------------------------------------------------
09 Central Electrics

    System description: BCM PQ35  H+ 
    Software number: 1K0937087A 
    Software version: 0360
    Hardware number: 1K0937087A 
    Hardware version: 020
    Long coding: 40990AB8D841F1C040080084110089A401711BAE632085605C4040000000

    Subsystems: 
        System description: Wischer 26080
        Software number: 3T2955119  
        Software version: 0602
        Hardware version: 22 
        Long coding: 00D7B7

        System description: RLS 300908 05
        Software number: 1K0955559AH
        Software version: 0402
        Hardware version: 54 
        Long coding: 0730ED

        System description: DWA-Sensor 00
        Software number: 1K8951171  
        Software version: 0104
        Hardware version: 001

        System description: LIN BACKUP HO
        Software number: 1K0951605D 
        Software version: 9001
        Hardware version: H08

    Trouble codes: 
        00924 - Relay for headlamp washer system Open circuit/short circuit to ground
            static
        00446 - Function limitation due to insufficient voltage Lower limit not reached
            Intermittent
        02394 - Bulb for left front parking light Open circuit/short circuit to B+
            static
        00532 - Supply voltage Lower limit not reached
            Intermittent
        02382 - Light recognition sensor Faulty
            Intermittent
        02395 - Bulb for right front parking light Open circuit/short circuit to B+
            static

 

 

OBDeleven data log

Date: 2018-01-09 15:27

    VIN: TMBBF73T999017636
    Car: Skoda Superb
    Year: 2009
    Body type: Saloon
    Engine: CBBB 125 kW (170 HP) 2 l
    Mileage: 84900 KM

---------------------------------------------------------------
52 Door Electronics Passenger Side

    System description: TSG BF       
    Software number: 7N0959792A 
    Software version: 0190
    Hardware number: 7N0959792A 
    Hardware version: H03
    Serial number: 0000100301354 
    Long coding: 011D0220DE01121002

    Trouble codes: 
        00110 - Mirror turn signal bulb, frt. pass. side Electrical malfunction in circuit
            static

 

OBDeleven data log

Date: 2018-01-09 15:27

    VIN: TMBBF73T999017636
    Car: Skoda Superb
    Year: 2009
    Body type: Saloon
    Engine: CBBB 125 kW (170 HP) 2 l
    Mileage: 84900 KM

---------------------------------------------------------------
42 Door Electronics Driver Side

    System description: TSG FA       
    Software number: 7N0959793A 
    Software version: 0190
    Hardware number: 7N0959793A 
    Hardware version: H03
    Serial number: 0000100299931 
    Long coding: 011D0220DE01121002

    Trouble codes: 
        00109 - Mirror turn signal bulb, driver side Electrical malfunction in circuit
            Intermittent

 

Check the fuse for the headlight washers, a lot of owners pull it out as they consume quite a lot of washer fluid.

 

They also blow quite a bit if the washer caps freeze to the bumper during the winter.

 

Some other strange faults, the LED indicators in both door mirrors faulty?

Is the car battery nearly cream crackered ?

Edited 9 January, 20188 yr by bigjohn

30 minutes ago, silver1011 said:

Check the fuse for the headlight washers, a lot of owners pull it out as they consume quite a lot of washer fluid.

 

They also blow quite a bit if the washer caps freeze to the bumper during the winter.

 

Some other strange faults, the LED indicators in both door mirrors faulty?

 

I will check the fuse for that. Last time I remember the mirror indicators were working.

 

I will also give the battery a good charge.

 

Thanks

Have you modded the car at all? Sometimes causes odd effects. Can remember once I had a racing snail, took of its shell to make it go faster, instead just made it more sluggish. 

 

Boom, boom!