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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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Thread Tools | Display Modes |
#1
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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 02:18 PM. Reason: Engine details previously omitted. |
#2
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Disconnect MAF and see if there is any improvement.
__________________
Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#3
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I will try that today and report back.
Thanks bud. |
#4
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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? |
#5
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and the engine designation is....?
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#6
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Oops...It's a 3.0tdi (2005/6)
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#7
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Did it/does it have a DPF?
Are they using VCDS or similar, or a generic code reader to diagnose?
__________________
===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#8
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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. |
#9
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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.
__________________
===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#10
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Youll need to repace the EGR valve. Cleaning doesnt work from experience
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