Turbo Diesel revs redline,can,t stop engine without stalling it???
 

Sorry it,s not an Audi,but it,s definately a classic.:lol:
1900(I think)TD Astra 1997year,it,s my Brother's.
I know there are some excellent mechanics(CREEP,CREEP:))on here,I don,t know anything about turbo,s,let alone diesel turbo,s.Could someone help PLEASE.
Cars done about 190,000 mile.He put it into a garage in Germany,to have a new cam belt put on and an oil change.After that,every so often the engine would all of a sudden rev very high(lots of smoke) and doesn,t stop even if you switch the ignition off:yikes:.Only way to stop it,is to stall it.(Not a sticking throttle cable)
Lately it,s been doing it more frequent.Now everytime he starts it,it does it ALL the time.
Don,t know anything about TD,s.
Could the wrong engine oil(as in synthetic)cause this,or could it be the turbo?Or both??
Thanks,Karl.:tup:

Sounds like that new oil is coming through turbo into engine :D Or, in worst case, through crack in block or head.

It is probably picking up the oil out of the sump. It needs sorting NOW.

I once saw a diesel car on the side of the motorway doing this. Revving it's tits off until all the engine oil was gone. Self destruct time.

Thanks,for your pointers.:tup:

Taken from another site:

Diesel particulate filter (DPF)

The DPF is both passive and active. In passive mode it burns off particulates through heat generated by the engine and exhaust system, so will do this on fairly long motorway journeys at 2,000rpm-plus.

It also has an active function, where extra diesel is injected into the combustion chambers to create enough heat to burn off the particulates as it is exhausted.

If it doesn’t burn completely, the excess diesel sinks into the engine sump where it contaminates the lubricating oil and raises the level.

Since diesels are compression-ignition engines, once this level gets too high they will start running on their own lube oil and can only be stopped by stalling them or by stuffing the air intake with rags (which few people are willing to do against a raging engine).

Car makers started to use DPF some years ago, that astra doesn't have one.

Thanks alot for all your help.:tup:
In the end Brother bought a spare engine from scrap yard.
Spent the day,preparing(removing cut pipes and wiring off)spare engine and removing one out of car.Haven,t worked on a car for a while,what a job.:wall:To get to one nut you have to take two other things off first.
Tomorrow brother will put in spare engine.Hope there,s nothing wrong with that one??The yard said it had less than 100,000 miles on it and it was a runner before taken out?We,ll see?
Thanks again for all your help.:tup:
Karl.

Should have scrapped it and got himself a good reliable Classic Audi of the same year... 1.9 VW/Audi diesels will go forever if kept maintained. Taxi Passat the same model as mine was in the garage a while ago showing 452K and only 1 clutch change...:yikes:

Like others have said, it is running on its own oil. I have seen this several times, usually when the turbo has been replaced and the intercooler has not been drained of the oil that has collected in it.

before replacing the engine, check;

That the oil is not overfilled

The oil drain pipe from the turbo is not damaged, kinked or blocked (they may have stuck a jack somewhere they shouldn't while removing the mount to change the cambelt)

That the turbo is not knackered (after checking the above, remove the intercooler pipes and run the engine to see if oil is being blown out of the turbo)

Make sure you drain the oil from the intercooler before putting it back together.

Thanks for your replies.
It turned out,it was the turbo had totally blown.LOTS of play.
The engine was on it,s way out anyway,so needed a replacement.
I,ll pass it on about the inter cooler,but i don,t think it has one??It,s a low pressure turbo.
Thanks,Karl.:tup:
I did tell him to get an Audi or VW,but he saw it while he was working away.Little old dear was selling it cheap and he was desperate for a car(Does alot of mileage,back and forth from work to see kids each weekend).Bet the little old dear,knew it was on the way out.:nod: