Hello. I hope I’ve posted this in the right place.

I’m looking for some advice on why my octavia 1.6tdi 4x4 is so much slower than my friend’s car of the same model and age.

At first I thought it was just because it was a 1.6 tdi (I’m used to 1.9/2.0 tdi’s) but since being driven in my friend’s car of the same model it’s painfully obvious that the acceleration from standing and at any speed is considerably slower than my friend’s car. 
 

The car has done just over 100k miles and is otherwise in good condition and drives smoothly. It’s just slow.

 

What would be the most likely parts to consider as a cause of this?

 

 
 

I thought maybe it could be an issue with the turbo. My friend suggests the injectors but the car seems to idle at a consistent note and no black smoke to be seen out the exhaust. No judders or obvious misfiring. 
No sudden drop in power through the Rev range. Just a consistent slow acceleration regardless of how heavy I am with the throttle. It takes a long time from depressing the accelerator pedal before it responds and when it does, the speed of acceleration is way slower than I’d expect. 
 

Any help much appreciated.

A scan is very much required here.  If your car had dropped into Limp mode, you would get a warning message on the dash. 

The Haldex 4/5 system does add in some weight, but it shouldn't be terrible.  I know that Skoda dropped that set-up due to poor emissions in 2017.

 

If the car is not showing any errors, then my suggestions is some Diesel Power Blaster from Hydra-International which I've used to great effect to help clean out an build up of soot from the EGR and help clean the DPF (all performance limiting factors).

Any loud hissing noise when you try and accelerate?  If so you could have a boost leak or pipe popped off (I drove our 2.0 tdi 4x4 with a loose intercooler pipe by the EGR once and it was dire but 'hissy'...)

Mine is the same . I recently had new egr valve fitted by a mate. Which did improve it slightly. I’m now thinking if turbo needs doing?? 

Sounds like gummed up turbo vanes

That would usually cause an overboost and put the car in limp mode, cycling the ignition normally clears it.

 

It sounds to me like a clagged up intake tract at the point of the throttle valve, I say this from experience of my 2.0TDi at 79k miles, however only yesterday I offered the same diagnosis for someone with the same vehicle, same engine (higher powered) and same year and another contributor corrected me that their engine was an EU6 compared to my EU5 and a completely different EGR set up.

 

So I can't be sure if my experience and suggestion is relevant to the OP, it does sound exactly like it though and I do have about 15 years of living with and working around stuck turbo vanes. That said a Mr Muscle enema would not go amiss, it could be that they are prevented from opening fully, maybe a sticky actuator as well?