Audi A6 avant 1.9 tdi awx engine. - EGR valve sticking ?? needs cleaning ??

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Mon 18 Apr 2011 16:42
Audi A6 avant 1.9 tdi awx engine. - EGR valve sticking ?? needs cleaning ?? - oldtighthead

On acceleration between 1600 - 2100 rpm she hiccups/hesitates. I've been told that is just when the egr valve is switching to all clean air but bot doing it sucessfully.

Where is this little blighter and how best to clean it ? . A replacement for this model is £170- ish but i'd rather give it a wipe of meths ! 150,000 mile so it's done quite well. I'm pretty handy on older cars with a haynes manual and gaffer tape, but no manuals it seems for these new complicated cars. Any help would be really usefull, thanks.

Keith

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Mon 18 Apr 2011 16:50
Audi A6 avant 1.9 tdi awx engine. - EGR valve sticking ?? needs cleaning ?? - 659FBE

Checking the EGR valve on the AWX is easy and can be done without any dismantling.

The EGR valve is actuated by a vacuum capsule, the top of which is visible on top of the engine to the left (as you look at it) of the oil cap. There is a rubber hose connected to the capsule.

Pull off the hose (with care if it has stuck) and fit a longer length of spare hose. Now suck hard on the free end of this spare hose and you should be able to get the valve to operate. When a good vacuum has been achieved, put your tongue over the end of the pipe and check the vacuum can be maintained.

Finally, release the vacuum suddenly, and you should hear the EGR valve close with a soft click. If necessary, disconnect the large air inlet hose at the "clip" connector so that you can observe the action of the valve stem through the engine intake.

In general, if the engine is not overfilled with oil, does not burn excessive amounts of oil and if you are using ULS fuel to EN590, EGR coking is rare on this engine.

659.

Haynes manual 4279 covers the AWX fairly well - but with a few crucial errors such as a failure to describe the modified cambelt tensioner and the method of setting it. Take some of the fastener torque settings with a pinch of salt too...

Edited by 659FBE on 18/04/2011 at 16:57

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Mon 18 Apr 2011 21:20
Audi A6 avant 1.9 tdi awx engine. - EGR valve sticking ?? needs cleaning ?? - oldtighthead

I'll give that a try thankyou.I looked up the manual , i just didn't think of checking that the Passat manual would cover my engine !.

I'll be back

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