ThePollitt
Posted a lot
Fix up, look... at that car on eBay!
Posts: 4,696
|
|
Sept 6, 2009 11:52:28 GMT
|
...what happens?
My Vectra did it yesterday on the M4, went to change gear and it dropped a load of smoke and then shot up to 6000rpm. I managed to get to get to the hard shoulder without incident, where the engine cut out.
It hasn't blown though, it still runs. I've been told I may have 'just caught it' before it threw a leg out of bed.
Anyway, what is it? Why does it happen? And more to the point, is my car now shagged?
Thanks guys,
Chris
|
|
|
|
|
93fxdl
Posted a lot
Enter your message here...
Posts: 2,013
|
|
Sept 6, 2009 12:06:21 GMT
|
diesels can go "runaway" when extra oil gets into the intake system there are several reasons for this happening a common one is where the car is normally driven gently and oil fume from the breather collects and one day you give it berries and the extra suck through the system pics up this oil and drags it in (mk1 golfs were a bit prone to this) also i seem too remember something about diesel vectras having a breather problem (but with my memory i cant be sure) but anything that allows engine oil into the intake gives you runaway (overfilled?) ttfn glenn ps your car probably isnt shagged so in future you must try harder
|
|
|
|
|
|
Sept 6, 2009 13:06:54 GMT
|
Shot turbo oil seal is also a favorite for this trick
|
|
To get a standard A40 this low, you'd have to dig a hole to put it in
|
|
|
|
Sept 6, 2009 13:25:17 GMT
|
This looks expensive
|
|
|
|
|
|
Sept 6, 2009 16:21:26 GMT
|
Shot turbo oil seal is also a favorite for this trick or being upside down in a ditch. :S
|
|
Volvo back as my main squeeze, more boost and some interior goodies on the way.
|
|
|
|
Sept 6, 2009 16:28:38 GMT
|
I had never heard of this phenomenon, and I have to say I'm amazed! Looks like a very bad thing to happen, although wouldn't turning the engine off stop it? Surely you would have to be spraying a fair bit of oil down the intake for it to run on without the injectors?!
|
|
|
|
Colonelk
Posted a lot
Posts: 3,742
Club RR Member Number: 83
|
|
Sept 6, 2009 16:33:53 GMT
|
apparently once they start scavenging oil its very hard to stop. Runaway is called runaway for a reason! you usually cant stop it, until its thrown its innards out, run out of engine oil to eat or you stick a CO2 extinguisher down its neck. Might be able to stall it too. This is what I gather from internet readings, no actual experience myself!
|
|
|
|
|
|
Sept 6, 2009 17:06:30 GMT
|
Happens to the 4x4 brigade a bit, if you get tipped over on your side the oil can seep in from the sump, luckily your normally in 4 wheel drive by the time that happens so not so hard to stall the engine as long as a wheel or two are on the ground, still kills one occasionally though.
|
|
Volvo back as my main squeeze, more boost and some interior goodies on the way.
|
|
|
|
Sept 6, 2009 17:46:54 GMT
|
Also I beleive if an engine is rather worn out it can draw oil up past the rings and run on the engine oil until there is none left..
|
|
1992 Sierra XR4x4
|
|
|
|
Sept 6, 2009 18:02:12 GMT
|
I had never heard of this phenomenon, and I have to say I'm amazed! Me neither! Scary stuff. Every day's a school day...
|
|
|
|
|
Tim
Posted a lot
Posts: 3,340
|
|
Sept 6, 2009 18:08:55 GMT
|
I had never heard of this phenomenon, and I have to say I'm amazed! Looks like a very bad thing to happen, although wouldn't turning the engine off stop it? Surely you would have to be spraying a fair bit of oil down the intake for it to run on without the injectors?! Turning off wont help - diesels stop by shutting off the fuel (stop solenoid). If its in 'runaway', then its not using fuel, its pulling oil through the turbo/somewhere else), so it will just rev and rev until it either runs out of oil and seizes, or the engine/flywheel explodes. Theres no rev limiting either as it bypasses everything. The BMW above sounds like it ran out of oil and seized. I certainly wouldn't want to be anywhere a diesel (especially a big one) thats revving to destruction) - worst case is the flywheel lets go! I reckon you'd struggle to stall it anyway. Just fry the clutch!
|
|
Last Edit: Sept 7, 2009 11:05:37 GMT by Tim
|
|
|
|
Sept 6, 2009 18:30:27 GMT
|
This used to be a surprisingly common occurance at a car auction I used to go to. Cars would be left idling for long periods awaiting their turn for sale, and when accelerated into the ring, would start to run away. They were generally old knackers at this place though, so most would probably be drawing oil through breathers, worn turbo seals, worn rings etc. Once it started, the driver would pop the clutch in a high gear to try and stall it. Failing that, they would exit the building at very high speed, and ditch the car in the carpark, leaving it to stop or explode. I must have seen 5 or 6 cars go this way. It would certainly liven up the evening.
|
|
1986 Panda 4x4. 1990 Metro Sport. 1999 Ford Escort estate.
|
|
|
|
Sept 6, 2009 18:34:52 GMT
|
seen this a few times,dci laguna's and bigger hdi's mostly,stalling is the only way to stop it,
yer fe*ked if yer in an auto though!
|
|
|
|
Gray
Part of things
Silence isnt golden!!!
Posts: 742
|
|
Sept 6, 2009 18:36:18 GMT
|
Ive had landrovers do this at horribly inopportune moments (sitting at lights etc) and even turning the ignition off doesnt stop it, its always been a shagged turbo without fail
|
|
|
|
93fxdl
Posted a lot
Enter your message here...
Posts: 2,013
|
|
Sept 6, 2009 19:00:28 GMT
|
heres a clip to show a diesel being pushed too far
ttfn glenn
|
|
|
|
mk14dr
Yorkshire and The Humber
Posts: 4,472
Club RR Member Number: 85
|
|
Sept 6, 2009 19:47:15 GMT
|
heres a clip to show a diesel being pushed too far ttfn glenn Jesus Thats a bit of a mess aint it. Has it Blown a huge chunk of block out, or straight blown it in half? Well, I suppose either way, it isn't running again
|
|
|
|
|
|
Sept 6, 2009 21:27:50 GMT
|
i've suddenly gone COMPLETELY off diesels again...
|
|
|
|
|
|
Sept 6, 2009 21:30:29 GMT
|
Diesel valve bounce FTW
Journey to Bristol terminated through engine epilepsy - FAIL!!
|
|
|
|
|
|
|
Isn't that called 'dieseling'. PPC's Rolls Royce did it with the oil and it ended up burning out the engine! The Vectra's had a 'firewall' between the sump and the cam cover, and while this was there to stop oil, it ended up getting clogged and and then blasting oil through when it got too much! The Vauxhall's have a terrible, terrible oil breather system in my opinion, where it all (the oil) eventually ends up through the inlet straight into the ICV valve, which is why some of the engines idle badly.
|
|
|
|
gasserjay
Part of things
Too bad the people who know it all can't do it all
Posts: 296
|
|
|
If you block the air intake they will die, done this a few times.
|
|
1970 LTD country squire 1978 VW Westfalia 1988 VW Westfalia 1973 E100 econoline 1973 E200 econoline 1967 VW Sparkafer 1973 VW GT bug 1965 21 window samba 1961 splitscreen double cab 1975 bay single cab 1956 oval baja 1975 Volvo 242 1993 Volvo 945 d24tic 1985 Transit tipper
|
|
|