I'm having some annoying issues with my 2006 Octavia 2.0TDI 140 at the moment. First the cruise control became sporadic , but I followed a thread on cleaning the circuit board and that's fixed that issue today.

 

Next problem concerns me more...What's happening is when i'm pottering along around 30 mph in say 4th gear with my foot at a constant throttle opening I think revs at 1600 rpm...ish  the engine acts as if i'm quickly taking my foot on and off of the throttle making for a jerky ride! if I drop to 3rd gear and keep speed at 30 its totally fine. The car runs fine at motorway speeds. Anyone else experienced this? 

 

One other thing it does... maybe  or may not be related is when its parked and out of gear at tick over the engine feels to shake a bit.. very much as though the engine mounts are loose or knackered, there's no knocking sounds or anything, just a slight wobble to the car. Anyone else experienced this? 

 

Thanks for reading hope someone can shed some light!

 

Cheers

Rich

Vacuum leak?

Sent from my D5803 using Tapatalk

Fuel filter blocked/ full of oil

Oil in the fuel (caused by the tandem pump/ tandem pump gasket)

Fuel lift pump (in the tank) on its way out

Injector fault

Injector wiring loom fault (wires are submerged in oil + go brittle causing intermittent injector faults)

All very common problems with the 2.0 TDI PD 140 (BKD/BKP) engines.

1st thing i would be doing is changing the fuel filter. Cheap + easy and they are due every 40k/ 4 years but should def be done more often on the PD diesels

If that doesnt sort it on its own I would plug VCDS in and check for faults in the engine

Edited 11 November, 201510 yr by mattvrestate

I'm having some annoying issues with my 2006 Octavia 2.0TDI 140 at the moment. First the cruise control became sporadic , but I followed a thread on cleaning the circuit board and that's fixed that issue today.

 

Next problem concerns me more...What's happening is when i'm pottering along around 30 mph in say 4th gear with my foot at a constant throttle opening I think revs at 1600 rpm...ish  the engine acts as if i'm quickly taking my foot on and off of the throttle making for a jerky ride! if I drop to 3rd gear and keep speed at 30 its totally fine. The car runs fine at motorway speeds. Anyone else experienced this? 

 

One other thing it does... maybe  or may not be related is when its parked and out of gear at tick over the engine feels to shake a bit.. very much as though the engine mounts are loose or knackered, there's no knocking sounds or anything, just a slight wobble to the car. Anyone else experienced this? 

 

Thanks for reading hope someone can shed some light!

 

Cheers

Rich

Good luck with this, I have pretty much exactly the same problem! My diesel filter was full of nasty stuff, am meant to be having a new tandem pump fitted at the dealers tomorrow... however I now have what feels like an extreme misfire under hard acceleration! Will let you know the outcome of my pump change assuming they do it!

Good luck with this, I have pretty much exactly the same problem! My diesel filter was full of nasty stuff, am meant to be having a new tandem pump fitted at the dealers tomorrow... however I now have what feels like an extreme misfire under hard acceleration! Will let you know the outcome of my pump change assuming they do it!

The fault starts with the Tandem pump. The tandem pump is the only place where fuel + oil meet.

The oil mixes with the fuel and the dirty fuel then goes back to the fuel filter + fuel lift pump (in tank) via the fuel return pipes.

If left long enough the oil clogs the fuel lift pump in the tank. It starts with a missfire under load and eventually the fuel pumps pack in and the car wont start.

Edited 12 November, 201510 yr by mattvrestate

Good luck with this, I have pretty much exactly the same problem! My diesel filter was full of nasty stuff, am meant to be having a new tandem pump fitted at the dealers tomorrow... however I now have what feels like an extreme misfire under hard acceleration! Will let you know the outcome of my pump change assuming they do it!

Ah its good to know I'm not alone! hopefully yours will get fixed today! let me know the results!

The fault starts with the Tandem pump. The tandem pump is the only place where fuel + oil meet.

The oil mixes with the fuel and the dirty fuel then goes back to the fuel filter + fuel lift pump (in tank) via the fuel return pipes.

If left long enough the oil clogs the fuel lift pump in the tank. It starts with a missfire under load and eventually the fuel pumps pack in and the car wont start.

Thats really helpful info thanks for helping. I will have a look into the tandem pump and fuel filter!, I will let you know how I get on.

Thats really helpful info thanks for helping. I will have a look into the tandem pump and fuel filter!, I will let you know how I get on.

 

Car is at the dealers now, thankfully the master tech came out and it played up worse than it ever has with me driving. He suggested fuel starvation, they are changing the tandem pump anyway as the filter was black and both the tank and filter housing had foreign matter in them.

 

The car wouldn't even break the speed limit in 4th on my test drive with him, so get checking yours before it gets to this stage as from what Matt said - once they give up you'll land up stranded possibly! Will update later with diagnosis of mine etc, hopefully it'll provide you a few pointers

Car is at the dealers now, thankfully the master tech came out and it played up worse than it ever has with me driving. He suggested fuel starvation, they are changing the tandem pump anyway as the filter was black and both the tank and filter housing had foreign matter in them.

 

The car wouldn't even break the speed limit in 4th on my test drive with him, so get checking yours before it gets to this stage as from what Matt said - once they give up you'll land up stranded possibly! Will update later with diagnosis of mine etc, hopefully it'll provide you a few pointers

 

For some reason they haven't fitted a new pump, instead citing the fault as air being drawn in from the connections on the tank! It goes well again now, still have the irritating idle judder, think I'm going to get my usual mechanic to play with the timing to get it better than -3.9!

For some reason they haven't fitted a new pump, instead citing the fault as air being drawn in from the connections on the tank! It goes well again now, still have the irritating idle judder, think I'm going to get my usual mechanic to play with the timing to get it better than -3.9!

That sounds promising,  I picked up a new fuel filter yesterday and there was loads of black floating bits in the filter bowl so it definitely needed changing.

 

When you say air was being drawn in from the tank, are we talking the actual fuel tank or something else? I will have a look at mine and see if they seem problematic.

The connection on the top of the lift pump was allowing air in under hard acceleration. Apparently wasn't seated properly.

Black bits floating in the bowl is something sinister however if I remember rightly it's either the tandem pump or the injector seals.

What colour was the fuel in the filter housing?

I'd Google links for you mate but my mobile Internet is very slow!

The fuel was a dirty blue / black colour loads of small black particles floating about. Certainly not right! I'm thinking I need to get a hand vacuum pump and suck all the crap out then fit a new tandem pump then suck clean fuel through before I start the car. As usual skoda genuine parts seem pricey so next search is for a genuine new pump from another source. Dark side seem to do one for 250 quid plus gaskets. Gonna see what my fav auction side has to offer next I'm hoping some thing under 200! Hopefully it's not the injector seals too!