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#1
20th October 2015, 12:51 AM
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Loss of Power :/
Guys,
Having some trouble here, and I'm at a loss for what to do... 2008, A8 Sport, 3.0 TDI..., 100k+ miles Car was driving fine couple days ago, pulled into the drive and switched off. Went to go out at night and there was just no power. It accelerated and changed gears fine, but just no "oomph". Took it back home and thought I'd let it sit for the night... wasn't in limp mode and went up through the gears to 6th fine and smooth. Anyway, this morning, wake up to go to the office - and same issue... just no power at all. Super slow to accelerate up to speed, definitely no torque. Went to the garage, plugged it in, said the turbo is fine, the gearbox is fine and though the engine had some fault codes it was nothing that should give these symptoms. (Codes: 13128, 06256, 12597) So we considered a blocked DPF... so I bought Forte diesel cleaner, popped that in the tank and went to go and run it on a long run. This is where it gets interesting... Car gets up to temperature fine, but when on the motorway the temperature gauge comes down from the middle to the first quarter line, and sometimes even below (towards the cold end of the spectrum). I pull over worried what might cause this, also considering that I was trying to put it into a low gear to keep the revs high and raise the temperature. On local roads, the temperature went back to the middle. But get back on the motorway for the return leg, and the temperature starts to go down again! And on the return leg I didn't even shift down gears incase that was the problem. What on earth is happening!? Suffice to say, I still have no power so perhaps the DPF cleaner didn't work, or wasn't really the problem, I have no idea. Cruise control also won't lock on. Final note, before all of this ever occurred, as most diesels - under heavy acceleration it used to black smoke a bit. But now, even under heavy acceleration there's no black smoke, not even any white smoke as I expected from the DPF cleaner. Anyone had this, or any ideas based on what I've described? Your help would be invaluable. I'm based in Birmingham in case anyone is about wants to try and help assess what's happening here. 
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#2
20th October 2015, 02:07 AM
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Possibly injector issues? Have you scanned the car fully with VAGcom to see what fault codes come up?
__________________
Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#3
20th October 2015, 02:09 AM
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Definitely feels like turbo not kicking in, engine seems fine to be honest.
I don't have VAGcom, but the garage had their own computer system and the three fault codes presented were in the first post but I think I didn't really make it clear... anyway they are: 13128 06256 12597 Does any of the things I mention ring any bells to you?
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#5
20th October 2015, 02:18 AM
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Quote:
http://wiki.ross-tech.com/wiki/index...01273#mw-pages
__________________
Confidence is the feeling you have before you know better . . . . Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#7
20th October 2015, 06:21 AM
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13128- turbocharger electrical control
06256- engine mount 12597- intake manifold Engine mount is not much of a problem but other 2 need to be investigated.
__________________
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
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#9
20th October 2015, 08:33 AM
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Quote:
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#10
20th October 2015, 08:34 AM
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Quote:
I must admit when it comes to these electrical gremlins, I'm at a loss for what to do - terrifically complicated cars these A8s!
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Linear Mode
