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General Forums: => General Boards => Topic started by: johnnyroper on November 12, 2016, 09:51:45 PM

Title: Audi A6 2.5tdi
Post by: johnnyroper on November 12, 2016, 09:51:45 PM
Anyone got any experience of the Audi A6 2.5tdi 6 speed manual,are the engines any good?

Seen one that's got high spec for cheap money,aux belt tensioner bolt has snapped so needs front end off to sort but other than that in good condition.
Title: Re: Audi A6 2.5tdi
Post by: Mirez on November 12, 2016, 10:23:05 PM
Thats the V6 isnt it? Good engine if so, fairly reliable but a a bit thirsty.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 12, 2016, 10:34:10 PM
Yes it is the v6.
Ever heard of the tensioner bolt shearing before? I am thinking probably alternator pulley seized causing vibrations that made bolt fail?
Title: Re: Audi A6 2.5tdi
Post by: Mirez on November 12, 2016, 10:41:52 PM
Yeah thats exactly what happens, very similar to the Galaxy but the layout of the belt makes it load the tensioner excessively. Once seized it snaps and any replacement will just do the same but unfortunately unlike the Gal, there are no noises to indicate its seizing, just occational rough idle.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 13, 2016, 05:46:18 AM
Thanks mark

I thought that would be the cause of failure, new alt pulley and bolt and all should be good again.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 03:48:25 AM
I decided against the A6 despite its price as it was showing signs of cam wear looking through oil filler. The cams on these are a known weak point as is the vp44 injection pump.

I have instead got a Mondeo estate in drag (x type) to pick up later in the week. 06 plate 2.0 tdi sport estate in silver with half leather etc. Full jag history with 140k on clock Ã,£700 which seems a decent price looking at others that are for sale. Apart from the potential for DMF failure and injector issues anyone know of any other common problems the ford 2.0tdci suffer with?
Am I correct in thinking this engine is chain drive and not one of them naff cassette belts?
Title: Re: Audi A6 2.5tdi
Post by: insanitybeard on November 15, 2016, 09:01:45 AM
On an '06 it's a Mk3 I assume, so it's the same basic engine as used in Transits of the same era- in which case it is chain driven. Not to say they were trouble free units, like you say, injectors (especially the Delphi ones) frequently gave trouble, depending on the configuration the power steering/ water pump (driven by a little belt from the non-chain end of one of the camshafts if I recall?) had a splined shaft between them which could corrode and lose drive, DMF's as you say....... I can't think of any other common faults at the moment but if I think of any more I'll let you know!
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 09:08:22 AM
I am not sure what mark it is,I thought all x type were same through the run of production?
I will take a look at the water pump drive when I go to get it, the DMF not a major concern as they are cheap enough these days. Glad it is the chain drive and not the cassette belt as on some of the other lumps.
The injectors are they an expensive job? I believe they need coding if replaced?
Title: Re: Audi A6 2.5tdi
Post by: insanitybeard on November 15, 2016, 09:36:46 AM
Oh sorry, I misread.... it's a Jag....... with a Mondeo powerplant. On an '06 it should still be the same unit as used in the Mk3 Mondeo though. The injectors used to be around Ã,£1K if you needed all 4, they may have come down a bit in price now though! IIRC, it was the 'correction' / calibration values that you had to input to the PCM via IDS (or WDS as it was then) when renewing injectors as they all have small variations in tolerance, the correction value was in the form of a long (16 digit?) code comprised of letters and numbers which were displayed on each injector.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 10:17:09 AM
They were fairly pricy injectors then,no doubt you can get recon Ines these days? So the figures are stamped on injector you then just have to input that,is that a dealer job or can anyone with the software do that?
Title: Re: Audi A6 2.5tdi
Post by: insanitybeard on November 15, 2016, 10:30:24 AM
Here you go, take a read here (http://www.dieselinjectorsuk.co.uk/ford-tdci-injector-codes/) and here. (https://www.pfjones.co.uk/how-to-code-delphi-diesel-injectors.html) Whether you can do it yourself I would imagine depends on whether the software / diagnostic kit you are using possesses that functionality.

Euro list a load of injectors for the TDCI engine fitted to the Mondeo, retail on most of 'em is upwards of Ã,£200 each.......
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 12:30:27 PM
Thanks for that I will have a read through later.

Ouch Ã,£200 a pop ain't cheap.
Title: Re: Audi A6 2.5tdi
Post by: Mirez on November 15, 2016, 03:39:59 PM
Yeah injectors are the biggest fail on these and IDS isnt anywhere near as easy to come by as VCDS :)
The mondeo estates suffer from rear subframe bushes wearing out and thats a big job on these, imagine the X est is the same.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 05:13:34 PM
I did see something about subframe bushes on mondeo and that you needed subframe changing in early days although bushes can now be got separate. Apparently the x is different on back and does not suffer subframe bush failure like it's ford brother.

Hear what you are saying about the software availability compared to vcds,for the money I am gonna take a punt on it as seems in very good order at present.
Title: Re: Audi A6 2.5tdi
Post by: Mirez on November 15, 2016, 05:26:25 PM
Ahh didnt know that, good news!

If you ever do need the services of IDS I have a mate with the full dealer setup ;)
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 15, 2016, 05:43:15 PM
I assumed it would be the same but looking at some jag forums the subframe is different as some x type can be 4 wheel drive?

Thanks mirez that's good to know should I ever need to have plugged in.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 18, 2016, 06:43:40 PM
@Mirez

I got the car today and it only has 1 key so like the gal I am assuming that rules out programming a new key myself? Would it involve getting a replacement through jag or could I get one and have it cut then get someone with IDS to code it to car? Or is it just a case of getting it cloned to the working key once cut?
Title: Re: Audi A6 2.5tdi
Post by: Mirez on November 18, 2016, 09:09:49 PM
Not sure on that one mate, it's been a while since I have worked on the mk3 mondeo platform soz!
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 18, 2016, 10:24:19 PM
No problem,I will do some research in to it.
Title: Re: Audi A6 2.5tdi
Post by: insanitybeard on November 19, 2016, 01:28:29 PM
I don't know if the Jag will have the same PATS setup as the Mk3 Mondeo but the Mondeo implementation would allow you to add/ clear keys yourself without the need to 'plug it in' as long as you had two programmed (but not cloned) keys in your possession- much like the Mk2 Galaxy- which doesn't help if you've only got one key. However, if you've got access to IDS it should be easy enough to add a key, assuming it will communicate.
Title: Re: Audi A6 2.5tdi
Post by: johnnyroper on November 19, 2016, 01:31:14 PM
I think it is same set up as the mondeo pats. I have had a ford key cut and cloned today as emergency spare until I sort out a proper one and get it coded with IDS.