Solved: 2.5L Engine Problem - [Your Car Model]

I'm going to post this sad story here...
'Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Gras. Es ist ein wunderschöner Tag.'

The sun is shining brightly and warmly. The birds are chirping happily in the trees. A gentle breeze is blowing through the grass. It's a beautiful day.
Hello everyone.

Maybe one of you can give me some advice or has experienced this problem before.

Yesterday I drove an Audi A6 C4 2.5 TDI with 103 kW, manufactured in 1996.
Suddenly, while overtaking, I lost a lot of power and aborted the maneuver, driving a few hundred meters behind the other car (I thought maybe the clutch had slipped). Suddenly, the engine started to accelerate (without me doing anything, no throttle input). It revved up, the car accelerated, and I didn't know what to do. I put it in neutral, but the engine continued to rev higher. I turned off the ignition, but there was no reaction; the engine kept running!!!! without a key!

The engine wouldn't shut off, so I rolled about 100 meters to a Volkswagen workshop (fortunately, it was only 300 meters from an Audi dealership, but the engine had failed).

The engine was still running, but now burnt oil was also coming out of the exhaust. A mechanic ran over to me. Meanwhile, the entire driver's cabin filled with smoke, making it difficult to see, and I had to cough. I opened the hood, pulled open the door, and got out.

The mechanic immediately tried to turn off the engine, but couldn't. He got into the car, engaged the handbrake, slammed on the brakes, and forcefully pushed the first gear until the transmission locked the engine (which didn't sound good).

I asked, quite desperately, what it could be. He said it might be a faulty turbocharger, which happens frequently with this type of engine. I then asked why I couldn't turn off the engine. He explained that it was because it wasn't drawing in diesel anymore, but instead burning oil. After about 30 seconds, there was absolutely no oil left in the engine; it was just emitting smoke!

Okay, here's the translation:

'Now, I have a question for you. The workshop can't look at it until next week. What could it be? Is a complete engine failure likely? And what would have happened if it were an automatic transmission?'
Please provide answers or share your experiences with us.
'Die Sonne scheint hell und warm. Die Vögel zwitschern fröhlich in den Bäumen. Ein leichter Wind weht durch das Gras. Es ist ein perfekter Tag für einen Spaziergang.'

I'd say the engine is probably broken.

Hi,

For example, if the turbocharger shaft breaks, a significant amount of oil can enter the intake manifold.
It's not necessarily required to stop the engine for that reason, but it could be. It would have been better to shut off the engine right away.
It definitely needs to be checked out. A compression test (without excessive engine oil in the cylinder recesses) would also be a good idea.

Best regards, Rainer.

I've just learned that the engine actually survived, and I am deeply surprised.

I wouldn't have thought a motor could survive that. Doesn't oil cause compression values to drop because it exceeds normal limits? Oil burns, but isn't it harder to compress than air? Am I mistaken about that?

Oohh...

First of all, my condolences. It looks like that probably damaged the loader.

'My motorcycle mechanic witnessed something like this about half a year ago, when the engine of a truck exploded at a gas station across from a shop. The driver was completely overwhelmed by the situation. Instead of shutting off the engine, he first tried to pump up the cabin to stop it near the fuel pump. However, since the truck's structure was somewhat damaged, it started spewing oil everywhere, making it impossible to get close. Meanwhile, the engine kept running as fast as it could, and of course, that meant no gear could be engaged.'
After about 10 minutes, the oil ran out, and the engine stopped with what he described as 'sounds of death.' My mechanic almost had tears in his eyes when he told me (he's a real mechanic, and this kind of thing really bothers him). He said that based on the sounds, the engine had been severely damaged in the last few minutes.

Is the engine really okay? Definitely verschandeln the entire intake manifold, as there's definitely material in the coolant! And carefully inspect the condition of the engine using your eyes and hands. It doesn't take much oil to cause the engine to seize. Just think about how little diesel it takes to rev the engine all the way up to its limit.
Why did that clueless mechanic try to force the car into first gear? You always shift into the highest possible gear; every sensible driving instructor teaches that.

It becomes clear again what a useful thing such a bypass valve is for.

CU Gremlin.

Hi there,
It's already very interesting, but it is possible with diesel engines.

Let's hope that something like that never happens to me.
because with the Fiat Lupo 3L, you might just have to get out and wait until the engine cools down.
because it is impossible to manually shut off the engine in a 3L vehicle.

One possible solution would be to manually operate the shut-off valve.
greetings

Hi Powersound!

Perhaps I misunderstood, but from Gremlins' text, it seems the Audi doesn't have a bypass valve. In newer TDI models, this valve is closed when the ignition is switched off, regardless of any turbocharger issues, so it could also be a solution for your Lupo!

"However, for someone with expertise, a misfire on the first cylinder is definitely unusual. But luckily, he still managed to sell the car. This certainly doesn't happen at every Volkswagen workshop!"

hi,
Yes, I meant the rescue service for a Volkswagen Lupo 3L.

but there I thought in a complicated way, so it required.
Yes, the shut-off valve closes when the ignition is off.
greetings