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audi a6 loss of power


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#1 razna

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Posted 14 January 2006 - 02:53 AM

Please help!!
Recently we've had an intermittent fault......It's a 2.5TDI quattro Tip, when accelerating the engine will produce less and less power, eventually stopping any acceleration above 3000rpm. If you put your foot down any harder it actually slows down!
You end up not being able to go any faster than 30mph!!
The garage has changed the airflow sensor we've still got the problem!
Any ideas!? /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif

#2 stratty31

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Posted 14 January 2006 - 10:17 AM

hi, and welcome.....does sound like an air flow meter fault..have they fitted a new one, or a second hand one?
could also be a gearbox problem, especially if it's multitronic(6 speed)...also check the fuses on the end of the dash board( drivers side)..there is a fuse in there that affects the supply voltage to the airflow meter..it will be labeled engine management, but check them all! /ubbthreads/images/graemlins/169144-ok.gif

#3 cruiser647

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Posted 16 January 2006 - 01:00 PM

The Quattro's only had manual or Tip. Never the Multronic jobbie.
Ask the garage what fault codes the system came up with. Then let us know.

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#4 Bluedan

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Posted 19 January 2006 - 10:12 AM

I've got this on an A4 Avant 1.9 TDI (B6) The garage changed the fuel filter as it had loads of black gunge in it (does anyone know what this may have been?) and lots of water. It still does it after a new one is fitted. The garage thinks it may be a dirty tank but I don't think so.
The Car can be totally fine for weeks, then one day it will be awful, pull away, change into second gear, then no power, after a while it will kick in, then the same as you change into 3rd etc. sometimes I'm holing up traffic at 30-40 mph on a busy road!! I've no idea what this is, and Audi can't help me unless its doing it when they drive the car! No fault codes show up on the Diagnostic test they did?? Anyone offer any help??? Thanks

#5 peterb

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Posted 19 January 2006 - 10:53 AM

My cousin has a similar problem on her Golf 1.9TDi.

Garage told her 'No fault codes'.

I read a fault code with VAG COM, but didn't clear it.

Car went back to garage and they still claim 'No fault code'!

Unfortunately, the problem still isn't resolved - I need to find a day when my cousin and I are both free to have a look at it.
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#6 Durrsaku

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Posted 19 January 2006 - 08:35 PM

Sounds like you have a blocked fuel line and the garage could very much be right.
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#7 colly

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Posted 19 January 2006 - 08:37 PM

This happened on my old A4, it was the turbo on its way out, could be worth checking.

#8 Bluedan

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Posted 01 February 2006 - 12:30 PM

My A4 has recently been diagnosed with a EGR Valve fault. Needs a new one which is about £140. Maybe its this? Quite common apparently.

#9 Jevon1

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Posted 04 February 2006 - 09:42 PM

Might be relevant - but if the EGR valve you are talking about is the same as you find on Japanese imported diesel cars (Shogun/Pajero etc...) then UK owners frequently BLOCK the valve altogether to prevent re-circulation of exhaust gases - improves power but arguably raises emmissions a bit.

#10 wcs_80

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Posted 06 February 2006 - 05:49 PM

This is very likely to be your Air Mass sensor. This is the most common VAG tdi fault, which results in power loss.

There can be other factors to consider though, is there any smoke when you hit the 3000rpm wall? if so, you may have a leak/corroded intake pipe.

Usually this problem is simple to fix. If you have VAG-Com, it wont always show the faults, the only way to test it is to check the air being recorded as the car is driven.

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#11 dixie2

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Posted 24 February 2006 - 02:22 PM

I've got this currently on my A6 1.9TDi. The car's been through 3 weeks of being checked by different people and various things done.

First was an airflow sensor which was replaced at a cost of £150. No change.

The garage that's currently dealing with it has repalced the Air Mass Meter, which apparently has made a difference. On top of this though, I am told that it is essentially a turbo problem. After only 88k miles I didn't expect to need a replacement turbo.

Apparently there is a lot of carbo build up on the turbo causing restriction of movement on the waste gate.

New turbo - £1500, replacement reconditioned unit £900, so I'm told.

Anyone any ideas re cheaper altenratives?

Dix

#12 manderson

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Posted 18 March 2006 - 12:35 PM

a quick test for the air flow meter is to simply un-plug it and take it for a run! see if theres a difference? If the ecu cant get a reading it will apply a default setting!

the proper way to do it is 2 have it pluged to a diagnosis computer while driving you have to compare the actual and nominal values from the air-flow/air mass meter!

a air-flow meter can be at fault without showing a fault code as it can still be within its limits! possible the garage just checked for codes and not for values???
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#13 manderson

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Posted 18 March 2006 - 12:37 PM

think i should start checking these dates before adding!!

if sorted??? post and lets us know how you got on!
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#14 dannym

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Posted 01 February 2011 - 12:48 AM

[quote name='razna']Please help!!
Recently we've had an intermittent fault......It's a 2.5TDI quattro Tip, when accelerating the engine will produce less and less power, eventually stopping any acceleration above 3000rpm. If you put your foot down any harder it actually slows down!
You end up not being able to go any faster than 30mph!!
The garage has changed the airflow sensor we've still got the problem!
Any ideas!? /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif[/QUOT

did you resolve your prblem and if so could you help me please.

#15 dannym

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Posted 01 February 2011 - 12:52 AM

did you manage to resolve your problem i have the same problem with my audi and would be grateful if you could help.

#16 rome_rod

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Posted 02 February 2011 - 08:30 AM

[quote name='dannym'][quote name='razna'][quote name='dixie2']I've got this currently on my A6 1.9TDi. The car's been through 3 weeks of being checked by different people and various things done.

First was an airflow sensor which was replaced at a cost of £150. No change.

The garage that's currently dealing with it has repalced the Air Mass Meter, which apparently has made a difference. On top of this though, I am told that it is essentially a turbo problem. After only 88k miles I didn't expect to need a replacement turbo.

Apparently there is a lot of carbo build up on the turbo causing restriction of movement on the waste gate.

New turbo - £1500, replacement reconditioned unit £900, so I'm told.

Anyone any ideas re cheaper altenratives?

Dix[/QUOTE]Please help!!
Recently we've had an intermittent fault......It's a 2.5TDI quattro Tip, when accelerating the engine will produce less and less power, eventually stopping any acceleration above 3000rpm. If you put your foot down any harder it actually slows down!
You end up not being able to go any faster than 30mph!!
The garage has changed the airflow sensor we've still got the problem!
Any ideas!? /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif[/QUOT

did you resolve your prblem and if so could you help me please.[/QUOTE]
No update yet? I read somewhere that someone, who had an issue very similar to yours, said that it could be a clogged CAT (catalytic converter). Have a look at that.

#17 cruiser647

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Posted 02 February 2011 - 12:33 PM

Also check what airflow sensor they changed it with. It's only worth using Bosch jobs - accept no substitutes.

It doesn't take much to see that the problems of three little people doesn't add up to a hill of beans in this crazy world.
 


#18 TIDYDUBS

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Posted 02 February 2011 - 09:48 PM

Might be relevant - but if the EGR valve you are talking about is the same as you find on Japanese imported diesel cars (Shogun/Pajero etc...) then UK owners frequently BLOCK the valve altogether to prevent re-circulation of exhaust gases - improves power but arguably raises emmissions a bit.


That is complete tosh! yea it raises emissions but you do not see any improvement with power........if you know anything about emissions and combustion EGR these days cools the charge down as the gasses are re-burnt as they have a cooler. EU5 vehicles in the VAG range have low a temperature EGR fitted too.
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