GlennR

Since you mentioned possibly ending up doing the piston soak I wanted to mention this,

The piston soak videos I've seen were on the 2.0 inline 4-cylinder engine. The 3.0 V-6 has the pistons slanted at an angle, you may need to use more of the solvent to cover the pistons well. Or perhaps jack the vehicle up on the left to tilt the engine to soak the left bank, and then jack the right side up to do the right bank.

Just something to consider for the V-6.

Good luck,

Simmm

I have a 2017 Q7 SLine, and about a month ago the Audi dealership has declared the engine needs to be replaced with a new one, at a cost of $33k offering me one other option to replace it with a used engine with a 60 day warranty on it at the cost of $18k. The engine started off by burning oil around 80,000 km, went to the dealership with concerns about that only around 95k km when it started to he more apparent and of course it was already out of warranty, so they told me that it's not a big deal, keep adding 1L of oil whenever I get the light in the dash... they did an oil consumption test and determined that it was consuming 1L at every 1700km. At 133 000 km the engine started vibrating, got a few error lights pop up in the dash, brought it straight to the Audi garage after which it was determined by them (weeks later) that there is no compression on Cylinder #2... and there is nothing more to do. After having reached out all the way up to the president of Audi Canada and after months of being dismissed, I was offered a 2500$ voucher off my next purchase of an Audi vehicle...
Did anyone else succeed in obtaining a more fair settlement in this situation, with an engine that was past the 80,000 km warranty mark? They basically flat out told me several times in writing that this engine is guaranteed for 80,000 km and they are not liable for anything else after that... I'm quite speechless and stuck.... any suggestions? 🙏

gbgastowers

Did they tell you why the cylinder had no compression?

Simmm

No, not at all. Only that the engine is not repairable.

AudiAllTheWay

I would want to to see bore scope pictures of the zero compression cylinder. If the valves are damaged causing zero compression then the engine can be repaired. If the cylinder wall is damaged then the engine is not repairable.

The number one cause of cylinder wall damage is a long term undetected stuck open fuel injector. To help avoid a stuck open injector, the manual says to periodically add a Direct Injection Cleaning Additive to a full tank of premium fuel. Do you happen to know if injection cleaning additive was used?

gbgastowers

Here was the cause of my zero compression. I suspect PCV valve failure caused it

2kwik4u

I had considered the angled pistons and the fill amount required to get to the "top" of the rings. On a few cylinders it won't be possible to get enough in the cylinder to completely cover the rings. It will have to be done when they are at the bottom of the stroke, and even then, it's WAY more fill than I prefer, considering the nature of the soaking fluid. This is actually the primary reason I was hoping to run the Valvoline Restore system, as it wouldn't have such a limitation.

I just took a new job in NY, so I'll be flying up/back to IN once a week until June or so when the whole family moves up. Not certain I have the bandwidth to jump through these hoops to solve the problem. We'll see what shakes out.

AudiAllTheWay

I was looking at that earlier with interest.

Is the ECU stock or tuned?

Did the valve material fracture or disintegrate? Is the seat damaged? It almost looked like there were remnants on the seat but could simply be dirt too.

If the valve fractured then the missing piece is likely resting up against the cat and may cause rattles.

silver_tt

That is a burned valve.... it is not fractured.

AudiAllTheWay

Thanks for confirming as I suspected same.