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D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again

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  #1  
Old 28th November 2014, 10:29 AM
Diablo Diablo is offline
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Default Smoking A8 3.0TDI and ECU Light on

Guys,

For some time, the engine management light intermittently has been coming on and then going off for weeks, without any running problems.
The light is now staying on, smells of strong exhaust fumes and occasionally smoke when in traffic.

A friend put his diagnostic on it and it had a code related to the EGR valve and something to do with insufficient flow.

Any thoughts or advice on how to get this resolved?

Thanks in advance for your help.

Last edited by Diablo; 20th January 2015 at 03:18 PM. Reason: Engine details previously omitted.
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  #2  
Old 28th November 2014, 11:17 AM
ainarssems ainarssems is offline
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Disconnect MAF and see if there is any improvement.
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  #3  
Old 1st December 2014, 11:32 AM
Diablo Diablo is offline
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I will try that today and report back.

Thanks bud.
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  #4  
Old 20th January 2015, 01:38 PM
Diablo Diablo is offline
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Default Things are getting a little desperate...

Hi Guys,

I still have this problem. It’s getting a bit desperate as the MOT is due in a few weeks…
In summary:

1. For the last few months the ECU warning light has been coming on intermittently and the car had a strong smell of fumes (a really acrid, overpowering smell)

2. The car now gives a lot of white smoke in traffic and if I rev the car at idle.


3. It does not seem to give off any smoke under load. The performance and fuel consumption seem normal.

4. The ECU light in now permanently on.


5. A local garage did a diagnostic and a code relating to insufficient flow came up.


6. They checked the EGR and it was clean. They performed a pressure test and it functioned correctly. The disconnected the MAF and that did not make a difference.


7. All the pipes were clear except for the EGR pipe where it comes back into the throttle body. That was badly clogged. He cleaned it out. The car ran a little better, but the ECU warning light stayed on.

8. The diagnostic was re-run and it is now suggesting a faulty throttle body.

Before I fork out for a new throttle body, can anyone throw any more suggestions at me?
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Old 20th January 2015, 03:14 PM
snapdragon snapdragon is offline
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and the engine designation is....?
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Old 20th January 2015, 03:16 PM
Diablo Diablo is offline
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Oops...It's a 3.0tdi (2005/6)
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Old 20th January 2015, 06:36 PM
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Adrian E Adrian E is offline
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Did it/does it have a DPF?

Are they using VCDS or similar, or a generic code reader to diagnose?
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Old 20th January 2015, 06:40 PM
Diablo Diablo is offline
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Hi,

Yes, I am informed that the car does have a DPF. The garage used an Audi diagnostic. I think it was VCDS.

Many thanks.
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Old 20th January 2015, 07:01 PM
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Adrian E Adrian E is offline
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Sounds like the entire EGR system needs checking over - by the sounds of it whatever cleaning they did has moved the blockage further up the system and clogged some part of the inlet system.
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Old 20th January 2015, 07:04 PM
mazm3 mazm3 is offline
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Youll need to repace the EGR valve. Cleaning doesnt work from experience
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