Golf GT TDI 170 DPF- Need advice...

[golfhappy]

There a specialist companies that can clean your DPF - for much less than 1000£.
This will remove around 90% of ash - so you should get an another 100k miles from it or so.

I would go with this option, way cheaper. Plus you'll be kind to the environment and humanity 

[Rhyso]

There a specialist companies that can clean your DPF - for much less than 1000£.
This will remove around 90% of ash - so you should get an another 100k miles from it or so.

I would go with this option, way cheaper. Plus you'll be kind to the environment and humanity 

And delaying the inevitable if the actual root cause is not found. Equally it doesn't always work.........

Sensor failure is a common problem so a full diagnostics session would flag up the exact problem

[GTIoxford]

Hi,

A little update.. The car has finally been remapped and had the Milltek bypass pipe fitted, but hasn't been on a rolling road.. The car is quicker yes, but I am experiencing some coughing / juddering / loss of power for a millisecond when accelerating..

As far as I'm aware my injectors have been replaced under the recall..

Any idea of what could be causing this? Would a dyno and a few tweeks help to iron these spikes out?

Sorry I am a technical rookie...

Thanks, Harry

[MK4_20VT]

Hey
   My GT 170 does the little stutter when it wants to start a DPF regen.  Then I get a better throttle response & more power?!?

Have you had the ECU altered?  I'm 99.9% you need the ECU altering, as it will still think it has a DPF.  The change stops the regen cycle

p.s what is the remap like?  I found my GT abit much & had the VW update map to reduce some BHP now at 164bhp, as a firm press on the load pedal just spun the wheels past 2500prm!!   

[Rhyso]

That 'update' is a myth

There's nothing in the file to suggest they detune it when they replace the injectors. Besides your peak power is developed at just over 4000rpm 

What tyres did you have fitted??

To answer the stuttering question; it could be a sticky EGR valve or perhaps the map hasn't been done properly. Who did the remap??

[MK4_20VT]

Hey Rhyso, think you my have mixed my reply with GTI Oxford.

I have had my injector recall in Jan 2012, but when my car was in for a service Aug / Sept 2014 I was told an update was out for my engine did I want it, so I had it done.  It has made the re-gen cycle less aggressive it that the right word.
As for the tyres I had on Pirelli P1000  Sure they are Pirelli.  I now get around 55mpg on the M6 (keeping up with traffic  )

Good call on the EGR valve, I will check it.  Funny if after all this time I thought it was the DPF regen 

Jay

[Rhyso]

First part was directed at you: second part was directed at GTIoxford 

Pirelli are sh!te 

EGR is worth cleaning out as it gets clogged over time and can affect the throttle response 

[GTIoxford]

Hi all,

I'm 99.9% sure its not the tyres, I haven't had the car long enough to put some premium ones on yet, these ones are Avons with good tread.

The map seems good, obviously I'd say it was bad if the map was at fault for the juddering.. The power comes thick and fast but seems to suit me. It was done by Viezu Berkshire, they're a Milltek registered dealer so I thought they'd be a good shout.

I have bought an uprated EGR gasket (the one with the smaller whole) as there is a lot of noise about the improvements on the PD170  it makes re: juddering post DPF removal.. Fitting tomorrow so I will update. Advice welcome

Thanks for your replies! 

[GTIoxford]

New gasket has made the car run a little smoother - definitely worth it, £3 it cost me.

Still juddering slightly.. Although (see new post) my fuel filter NEEDS changing. It hasn't been changed in 50k!!

Thanks

[GTIoxford]

Ok.. So my car is still hesitating / juddering when I put my foot down or just go a little heavy on the metal..

I have so far:

1. Changed the EGR gasket to the one with the smaller whole
2. Replaced the fuel filter
3. Used injector cleaner
4. Confirmed with VW that the injectors were replaced under the recall

Possible problems?

1. Fuel pump?
2. Map?
3. An air leak somewhere

Any advice would be great