Acceleration Hesitation/Loss of Power?

[MarkTM]

Bazz

Any VCDS help requests should be posted here:

VCDS - Help Requests

As to any specialist in the Birmingham area this thread may be useful:

Recommend a VW specialist in Birmingham?

The search facility on here is quite good

Oh, it would be useful if you could give the year/gearbox and if quattro or not?

[bazz326]

Thanks for the swift replies! and apologies I will post the VAG-COM request in the appropriate section.

I have a 2009 2.7 Diesel A6 le mans tdi cvt 177bhp (Saloon) and is not Quattro.

Also thanks for the links

[bazz326]

Bad news, started off home today and car started fine drove down the road to a junction and went to pull out.

As I accelerated the car hesitated then cut out dead. Had to roll across the junction and stop just As I got the other side.
People were not happy. Managed to start the car again and has been ok apart from slight hesitation when accelerating from 1st.

Think I'll be trying to get it booked in asap.

I was thinking maybe it was the battery but I've read numerous other possible causes such as egr valve, maf sensor, temperature sensor, air filter, fuel filter/pump.

You get the idea.

Just thought I'd provide an update.

[MarkTM]

Without a scan it's a coin toss.

I would say fuel system as opposed to anything else.

BTW multichronics need a fluid and filter change every 40k miles, is their evidence yours has had these?

[herby0001]

I don't have an A6 (yet!) but the symptoms you describe made me think of a dodgy ECU relay which on a Golf is called Relay 109. This can cause the car to stall. The other thing I thought of was the fuel tank lift pump. Again, from Golf experience, when the ignition key is turned (before the position to start the car), you should hear a soft whirring of the pump for a second or so to prime/pressurise the fuel system. Finally, could it be something as lame as a lose fuse? Check all fuses to ensure they're sound and seated properly. A scan might well point you straight to the problem. A poorly performing battery can cause all sorts of woes, but you can get an idea of its state from the MMI, IIRC.

[niall campbell]

you could go back to basics and do the fuel & air filter to rule them out ...................... I do mine every 20,000 as there is no drain now for water, meaning its likely to freeze in winter

then go for the transmission oil if no improvement

[bazz326]

Ill think ill start with the fuel and air filter then go from there.

I was thinking while im rooting around in the engine bay I may take a look at the throttle body and EGR valve.

As an update for today my car ran absolutely fine, no start-up issues, no hesitation when accelerating ect. So whatever the issue it seems to be intermittent

[rowdy-999]

I doubt its a filter issue.
Get a proper scan done, but sounds like the fuel tank pump to me.