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Discussion Starter · #1 ·
This has been a code thats been thrown up over last few weeks. Static forced regen didnt cure it unfortunately.
Having never used a garage in my life the thought of dropping subframe and transfer box gave me a sore head 馃槴 with no ramp 馃槺 or time! Off my boy went to an independent vag specialist and was stunned as to how bad the egr was blocked. I asked garage for old egr as my curiosity was getting the better of me. For a 50k 2.0tdi its quite shocking but he鈥檚 not been in my care long enough to cause that! Also told egr valves only have a life of 8-10 yrs. bear in mind didnt really have any symptoms apart from code thrown up (I know every noise tick and how this boy runs)
Thought it might be of interest to those that havent seen inside an egr valve before, after taking apart I couldn鈥檛 believe how coked the ports were!!
2357
 

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Holy sh*t that's bad! Not having an oil burner myself I can't compare it with others I've seen but to me it's a miracle the engine was still running with that degree of blockage.
 
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Discussion Starter · #3 ·
The engine would run until dpf decided it had enough. Engine would albeit running rough but Im astounded that there were no signs apart from eml and on taking on last journey to garage a slight diesel fume smell which wouldn't have been noticed if wasn鈥檛 paying that much attention and knew the problem. There鈥檚 a lot to be said for these engines. Pretty tough
 

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A remarkable picture!
 

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Thanks for the picture Cat - not a pretty sight.
I believe Audi were replacing them under warranty when they regularly failed shortly after the dieselgate retuning was completed, but that was a while ago now. As you have mentioned, they are not the most accessible for an easy replacement either on the transverse engines.
Many other members are also reporting similar carbon buildup in the throttle body. At least that is a lot more accessible for checking

Would you suggest the EGR could have just been cleaned out and re-installed with new gaskets, rather than installing a new one?
 
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Discussion Starter · #6 · (Edited)
I don鈥檛 really believe in flushing the egr鈥檚 to be honest, especially at 8yrs old thats my personal opinion though. It would never completely get rid of carbon and once carbon there it tends to be easier for more to stick to. Plus the cooler and vacuum on it being one complete unit, I鈥檇 rather just replace. Yes unfortunately I鈥檓 a few years out of getting egr done under the audi scheme.
 

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Discussion Starter · #8 ·
Yes it does! In the time Ive owned it, its never even been near a supermarket petrol station. (Ive heard of the how you drive it, using cheap fuel etc) In its previous life however who knows where its been. I am tending to go with the never had decent runs going by previous owners and the state of the egr.
 

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Over the last 14 months, decent runs will have been a rarity for most people.
Compound that with the appalling standard of rural driving these days where 30 is deemed reasonable on perfectly satisfactory back roads, no doubt in top gear by the way they grind to a crawl at the first slight incline.
I went out for an, until now, rare ride on the Triumph today and gave up after 10 miles and came back home, it was so bad for speed and silly busy. I felt really young at 66!
 

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DavidS, I totally agree with you. On the planet of Yorkshire many people drive on the outside of their lane at 10 to 15 mph below the recommended maximum speed limit even if it is safe to go up to that speed. The other main thing I have found is that during the pandemic many new car owners have been trying to save money by ordering their vehicles without the indicators option. I can understand why diesel vehicles are clogging up.
 

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Thanks for sharing the pics Cat
Looking at the state of the EGR cooler I also wonder if the 'throttle body' has similar levels of carbon build-up.
Luckily, as manfrotto indicated however, access is a lot easier than for the cooler.
From what I've read, replacement of the cooler on a Quattro is a 5 hour job (if you have the right kit and know what you are doing) so it's another vote from me to replace rather than attempt to clean the cooler

Cheers Spike
 
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Discussion Starter · #12 · (Edited)
Thanks Spike this is something to do over the weekend. Its developed a weird split second delay on acceleration in revs 1800-2500k and very sporadic. For the life of me I cannot make him do it to order. Its not a miss as such, quite hard to explain. A bit like the delay used to get on older fly by wires press pedal hmmm nothing for split second oh ok Im meant to go now sort of thing. Strange that it wasnt there before new egr fitted or on drive home after garage and not there in the 2 of the 3 journeys its taken since getting home.
The first time it did it, it was that quick I questioned myself but another 3x on that journey doing this weird split second delay I definitely didn鈥檛 imagine it.
Throttle body clean on the cards, certainly wont do any harm. Thanks for reminder 馃憤馃徎
 

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I know of a few Audi owners who have had intermittent acceleration problems where a full clean of the throttle body has cured the problem.
 
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Discussion Starter · #14 ·
Ive had that exact issue on a petrol opel few years ago, flat spot around 3k tiny breather blocked cleaning throttle body cured it. Throttle body on this one having just checked is pretty clean so not that, its been ruled out now. I wonder if egr and throttle body has to learn how to work as a team again seeing as egr new. Its a weird one.
 

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Good point Cat. Did they do a throttle body/EGR alignment when they put the new EGR in. I am not sure if it would have been necessary, but worth checking.
I am not expert having not done it myself, but there is plenty of chat about it on the various forums, and can be done using VCDS.
 

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Had a quick search and can't find any requirement for coding / adaption of the 'throttle body' on a TDI as the terminology really applies to petrol engines only.
Officially, on a TDI it's called the J338 throttle valve and has 2 main functions.
First as an anti shudder valve to reduce the compression effect and allow the engine to stop smoothly when switched off. Second is to induce a vacuum effect in the intake manifold for optimised EGR gas flow under part throttle engine operation

Cheers Spike
 
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Discussion Starter · #17 · (Edited)
Im going to have another look at weekend, there鈥檚 something choking/holding it back for split second at 2k and its really annoying. Can anyone tell me when the boost actually comes in on the 2.0 tdi鈥檚?
 

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Discussion Starter · #19 · (Edited)
Attached is an engine guide for Golf diesels which is pretty close to the Audi Q3 diesel. It shows all the various components and how they work.
Do you have any other fault codes other than the P04030 ?
Thanks, I鈥檓 generally pretty good with how engines work (have a great teacher) There has been no fault codes (not even a pending/possible sniff of any fault codes) since egr changed.Even did a re-adapt just incase garage hadn鈥檛 (its an egr valve and they tend to learn within 50-100 miles anyway but done again just incase. Did wonder if all the components were like woah big space clear ports in egr whats going on, instead of gases having to fight their way through. (Sounds bit daft but it may take a bit of getting used to having all that space to move around?)
I cant see it being a boost leak/turbo lag as there would probably be other signs but its a case of ruling things out. The boy鈥檚 running spot on apart from this silly wee blip 馃槚
 

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