A6 V6 TDI no power after 3000 rpm

[MCHAUDRY]

Hey fella's

Just bought a 2000 A6 Avant 2.5 TDI with 112K.

After 3000 rpm it just doesnt want to know. Its in limp mode at the moment according to a diagnostic machione today and the fault codes brought up 3 sensors not working. The guys in the tuning place told me to bring it back so they can spend more time looking at it at a cost of £83 p/h.

When the revs are coming down there is a gurgling noise coming from around the air filter box. Sometimes sounds like worn bearings from one of the pumps

Any one had any of these problems. The garage reckon its one sensor which is causing the other sensors to give a fault code.

Does anyone have any experience of this and be able to point to the probable cause or more likely sensor and what could be causing the funny noise on deceleration

Cheers:beerchug:

[Torque-Torque]

Check the 15A fuse for the reverse lights which also feeds the MAF (maybe position 23). If the fuse is blown, the engine defaults to limp mode and there is no power at all in the upper park of the rev band. This will also throw fault codes for the MAF and some others.

[MCHAUDRY]

At last a response !!!!!!

Ive just checked the reverse lights and their both on so that rules the fuse out.

Someone mentioned MAF sensor before, my car had a new main dealer one fitted 60k miles ago. Ive seen new ones on Ebay being sold for £40 whilst main dealer charges £200.

Is it worthwhile buying the one for £40 and fitting it myself or better still cleaning my existing one. Dont know if this will make any difference cos on a recent diagnostics test 2 fault codes came out, dont know if these affect performance, Any ideas ???

01375 - Valves for Engine mounting, stage 1
38-10 Output wont switch or short to plus - intermittent

00601 - Potentiometer on positioning motor for central flap (G112)
30-10 Open or Short to plus - intermittent

I dont know what these. If you know and could advise me on the remedies it would be much appreciated

Cheers mate in advance

[Torque-Torque]

Don't think either of these trouble codes should put you into limp mode (the 2nd is related to the climate control). There must be other trouble codes specifically from the engine management. Ideally find someone nearby with VAG-COM and get all the codes cleared and rechecked.

Another possibility is that there is an air leak so check all the small pipes (esp. the EGR valve circuit) connected to the induction side and the electrical connections to the MAF. The MAF is easy to fit (10 minute job with a screwdriver) but dont bother unless you have exhausted other possibilities. Whether you go for an OEM or pattern part is a personal decision but even an OEM part and DIY will cost you a lot less than £200.

Failing that you might consider if the wastegate is seized or the charge pressure sensor is not working. Still these should show up with trouble codes, so that is really where you need to start.

[dancook]

http://www.vwaudiforum.co.uk/forum/showthread.php?t=22361

I had a problem with the MAF, could be the same thing - I have no car fixing experience - and fitted it myself :)

as mentioned in my thread, try unplugging it and see if the car takes off :)

[MCHAUDRY]

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Eh !!!!
Whats jews and catholics got to do with my sluggish car