AUDI A1 Turbo Blown.

[PeteH]

Just been told that it was white smoke that came out of the exhaust.
Not black as I was originally told and posted in the first post on this thread.

Doesn't that mean your car has chosen who will be the next Pope?

[Ernst]

Normally a ran-away diesel automatically stops when all the engine oil has been burned, you can image what happens to an engine running at 6000 rpm without engine oil....
It could have been sucking oil through the crankshaft engine ventilation (don't known the official English term, sorry), there are more ways then via the turbo to get engine oil into the combustion chamber.

(BTW since when is audi premium? They're only re-badge VW)

[lizzard-t]

I don't want to be MR Doom and Gloom here
But white smoke is oil , it's probably used the mixture of oil and diesel in the sump to run , so it's run the bottom end dry ( or until,there was nothing left to burn .
So in gestatimation I think at least it's going to require engine rebuild bottom end crank , bearings .
I know it's hard trying to get information via text , phone calls .
But from the description, that's my diagnosis.
They could just check oil level via dipstick, to see if any is present on the stick , but I think it's used what it can to fuel the car .

[Witty]

I don't want to be MR Doom and Gloom here
But white smoke is oil , it's probably used the mixture of oil and diesel in the sump to run , so it's run the bottom end dry ( or until,there was nothing left to burn .
So in gestatimation I think at least it's going to require engine rebuild bottom end crank , bearings .
I know it's hard trying to get information via text , phone calls .
But from the description, that's my diagnosis.
They could just check oil level via dipstick, to see if any is present on the stick , but I think it's used what it can to fuel the car .

Would you know what would have caused the turbo to run away in the first place??...

[lizzard-t]

If it's got a DPF then failed regens would of increased the level of the oil in the sump , by that point the oil is now mixed with diesel .
The level increases to such an extent that it blows back past the piston rings or finds its way into the combustion chamber via the breather system . By that point the engine will run on anything, once revs increase even slightly, the natural combustion process will take over and no matter what position the throttle pedal is in , it will run and pump whatever is in the breather system into the cylinders , untill it has no more .
It won't of been the turbo that would of run away it would of been the engine that would of spooled the turbo up !
A bit long winded I know witty
But that's what would of happened.

[Markvx]

Hi the turbo didn't run away the engine did its down to a engine sealing braking down turbo piston ring or breather system. Is the car high millage or a town driver small trips

[Witty]

Hi the turbo didn't run away the engine did its down to a engine sealing braking down turbo piston ring or breather system. Is the car high millage or a town driver small trips

Mainly town driving but does get the occasional run to allow for regens.

[RBH]

.....

[Witty]

Further to this, I have been to see the car myself for the first time since it happened.
Spoke to an Indy Audi specialist, and questions were asked and answered.
He doesn’t think it is the turbo either.
There is way too much oil in the sump for it to have been run dry.
So have ordered some cheap service parts to give the engine a quick service.
So going to refit the original turbo next week and replace the oil, oil filter, air filter and fuel filter.
Hopefully we will get it started and take it from there.
He did suggest it could be a faulty injector as lizzard-t mentioned.

[lizzard-t]

Well,witty it sounds like you may be able save it .
As there is oil on the stick .
Your heading in the right direction with servicing it then take it from there .
It was only a hunch with the injector , but from the description on when they started it again then that coukd we'll be why .
We are all,here to help one another.
Fingers crossed.

[Witty]

Well,witty it sounds like you may be able save it .
As there is oil on the stick .
Your heading in the right direction with servicing it then take it from there .
It was only a hunch with the injector , but from the description on when they started it again then that coukd we'll be why .
We are all,here to help one another.
Fingers crossed.

Your input on this has helped loads

Will update as and when, whatever the result. Thanks again, much appreciated.
Hopefully early next week will have an answer. Weather permitting, as will be working outside unfortunately.

[Alex421]

I thought I'd offer a little advice for anyone who suffers run away, place the car in 4th or 5th gear and let clutch up with brakes applied as this should stall the car and limit damage

[Alex421]

Your input on this has helped loads

Will update as and when, whatever the result. Thanks again, much appreciated.
Hopefully early next week will have an answer. Weather permitting, as will be working outside unfortunately.

Has anyone tried a leak down test on the injectors? That way you should atleast know if it's injectors.

[Witty]

Has anyone tried a leak down test on the injectors? That way you should atleast know if it's injectors.

Just want to try and get the car running, that way we can get it to this Audi specialist and he can look at it there.

[Witty]

Latest update is as follows.

Managed to refit original turbo with no new parts fitted.
Gave the car a cheap and basic service to try and get it running.
Hey presto, the car fired up first time, found an oil leak, stripped the turbo off to find that a gasket had slipped out of place.
Refit again and no oil leak. Left it running on tickover for about 15 mins.
Then started to build the revs up slowly. Found no problems.
Got the car to the independent Audi specialist so that he could give the car a good check over.
Got a phone call just before he closed today, to get the confirmation that there is nothing wrong with the car.
We can collect the car back first thing in the morning.
When we drained the oil, there was 8.5 Ltrs in the sump. Should only be 4.3 ltrs.
So all the failed regens had dumped the fuel into the sump.
All the smoke was what the turbo could pull through the breathing system.
Happy days.
My daughter is one lucky bunny.
Lesson learned.