sleeeepguy

Spoke to my Audi service coordinator. Audi released a Service bulletin (some long number I couldn't write while I was driving) saying something to the effect that they are aware of the issue. Get car to dealership for a replacement Fuel Filter and to have water removed from lines? Wax is being built up in extreme cold conditions from fuel. Don't use additives. They want a fuel sample upon service.

MiQ7TDI

So this is corrective action. For prevent, I suppose they say don't expose the vehicle to harsh conditions?

Is diesel fuel actually that pure of a consistency coming from the pump? I don't understand the resistance to an additive as opposed to the other more invasive remedies.

DUTCH VanAtlanta

Who gives a rat's hinder side about what Audi says! When I use the Power Service additive at 8 oz/25 gallons of diesel, the engine runs better, gets better fuel mileage and starts/runs just fine at 8°F. That's all I need to know!

I'm really fed up with Audi's attitude towards and lack of support for their customers, enough so that my 2010 Q7 3.0 TDI is for sale.

rcr2nv

I had this happen last winter too, -10F. same indications, 1k rpm = shutdown, then low battery, then CEL. turns out the ad blue froze and the engine would not start until battery was >11 VDC and ad blue would flow. Audi dealer in SLC provided no resolution. No tank/line heater/ recirculation solutions were available.

Should anyone determine a solution other than additives to the diesel I would like to listen.

DUTCH VanAtlanta

Here are a few articles that might be of interest regarding the biodiesel blends. Yes, it's Mercedes information, but the common rail diesel technology is very similar from marque to marque.

Isologous

I found a Diesel Driver article that clearly lays our the B20 issues.

Add to this, I received a letter from Audi that included the following line:
Now and after Audi has changed the addblue injectors twice, changed the crankshaft sensor, and some other repairs that I do not remember, Audi has traded the vehicle for a new one (still TDI). The technicians still do not know if they fixed the problem or what was wrong with the original vehicle.

Jacket

Good thread - thanks for all the info. I haven't had any starting issues yet here in Colorado and we've been down in the 0 to -10 range at night. I've been using the diesel additive just in case. Interesting oversight on Audi's part regarding the freezing of AdBlue.... It's funny to me now, but if I ever get stuck because of it I'll be pissed.

B490MTL

The Adblue freezing is a weird thing. I work in public transit servicing buses and all the buses we have equipped with DEF come with an engine coding allowing the engine to run "dirty" for 60 minutes (without DEF being injected because its frozen) all our DEF tanks are equipped with a heating coil allowing the DEF to thaw. I dont see how Audi would´nt have taught of that.

kierantaylor

I bought a 13 TDI yesterday. 45k mile Premium Plus for 37k.
Really loved it for the 2 hours I used it.
I'm in NH where the temps went about -15 F last evening. -13 this morning and car would not start. T
ried again now that it is 4 F and still won't start. I don't really have a garage to push it into so I suppose my only options are

1- Call dealership and demand it is towed the two hours home
2- Pay AAA for the towing
3- Wait until tuesday when it will be 40F

I suppose going forward I will use the additive. Really pissed. Let me know if there is a way to expedite the thaw.

Kieran

D3Audi

Since you bought it yesterday, call dealer and let them know it's not starting and you need a tow. Play dumb, say you don't know why it's not starting. They will cover it, Let them take care of it. My V8 gas Q7 has had trouble starting in this weather the northeast has had. I can't imagine owning a diesel. Good luck.