V50 Engine 2.0D : - Stuck throttle - HELP

the pasty · Oct 19th, 2015, 07:57

Hi All. Scary moment yesterday. Joined a dual carriageway yesterday after 1.5 hours of normal car behaviour when, all of a sudden, the throttle appeared to get stuck when changing from 3rd to 4th - it hit 5,000+ rpm and produced a plume of whiteish smoke out the back. Once in gear the revs and car returned to and drove as normal.
Pulled over and had a look under the bonnet - nothing obviously wrong: engine oil, dipstick, coolant all looked normal levels/colour, no explosion of fluids anywhere. Started engine again (stationery) - started/idled fine. Revv'd it a little then a little more then suddenly revs ran away and hit 6,000 rpm (definitely not good for a diesel!). Managed to quickly calm the engine again by putting into 4th and lifting the clutch a little - rpm then dropped down to tickover. Drove gently home afterwards (1hr), with smaller throttle movements in case it was a sticking issue.
Several questions:
1. Is this a sticking throttle body or problem with the throttle pedal? Pedal itself was not physically stuck though.
2. Isn't there a rev limiter to prevent 6,000 rpm being hit?
3. Any other thoughts on what may have caused this?
Thanks in advance

msh · Oct 19th, 2015, 12:06

Check to oil in the inlet pipe. It may be the seal have gone in the turbo and oil is getting into the inlet manifold and fuel the engine.
Mark

the pasty · Oct 19th, 2015, 16:30

Thanks. There is some oil in the inlet pipe, although there has been a smallish quantity present for the last 80,000 miles, or so, and it is no worse. There is never any smoke from the exhaust in normal day-to-day use - and I do not drive very slowly - excepting yesterday's extreme over-revving events.
In any event, I will check for error codes to see if anything has been thrown up.
Still curious though why the engine was not limited to a maximum rpm. Doesn't the 2.0d have a rev limiter?

alfadave11 · Oct 19th, 2015, 20:17

might be of interest 2 nd page put your model in http://www.vosa.gov.uk/vosa/apps/recalls/default.asp

msh · Oct 19th, 2015, 22:05

Hi
If the engine is using oil as fuel. Then the rev limiter will not work.
In extreme cases of turbo oil seal failure enough oil gets into the inlet to run the engine at very high revs until some thing breaks. you can turn off the key
disconnect the battery and fuel lines and the engine still runs
Hope it's something simple and cheap to fix
Mark

benr7310 · Oct 22nd, 2015, 16:34

Your best option if this does happen and won't turn off is to put it in high gear, handbrake on and hard on the brake then dump the clutch. I'd rather a clutch replacement than engine replacement.

Alternatively if you can do it quick enough.. block the air intake to starve it f oxygen & it will die.

Oct 19th, 2015, 07:57	#1
the pasty New Member Last Online: Oct 22nd, 2015 21:10 Join Date: Mar 2010 Location: poole	Stuck throttle - HELP Hi All. Scary moment yesterday. Joined a dual carriageway yesterday after 1.5 hours of normal car behaviour when, all of a sudden, the throttle appeared to get stuck when changing from 3rd to 4th - it hit 5,000+ rpm and produced a plume of whiteish smoke out the back. Once in gear the revs and car returned to and drove as normal. Pulled over and had a look under the bonnet - nothing obviously wrong: engine oil, dipstick, coolant all looked normal levels/colour, no explosion of fluids anywhere. Started engine again (stationery) - started/idled fine. Revv'd it a little then a little more then suddenly revs ran away and hit 6,000 rpm (definitely not good for a diesel!). Managed to quickly calm the engine again by putting into 4th and lifting the clutch a little - rpm then dropped down to tickover. Drove gently home afterwards (1hr), with smaller throttle movements in case it was a sticking issue. Several questions: 1. Is this a sticking throttle body or problem with the throttle pedal? Pedal itself was not physically stuck though. 2. Isn't there a rev limiter to prevent 6,000 rpm being hit? 3. Any other thoughts on what may have caused this? Thanks in advance

Oct 22nd, 2015, 16:34	#6
benr7310 Master Member Last Online: Dec 29th, 2023 17:48 Join Date: Sep 2011 Location: Thurrock	Your best option if this does happen and won't turn off is to put it in high gear, handbrake on and hard on the brake then dump the clutch. I'd rather a clutch replacement than engine replacement. Alternatively if you can do it quick enough.. block the air intake to starve it f oxygen & it will die. __________________ V60 D5 215 (pre-facelift) Ex-S40 Sport 2.0d with 180bhp & 300lbft

Oct 19th, 2015, 12:06	#2
msh Senior Member Last Online: Oct 15th, 2017 11:57 Join Date: Aug 2010 Location: paignton	Check to oil in the inlet pipe. It may be the seal have gone in the turbo and oil is getting into the inlet manifold and fuel the engine. Mark

Oct 19th, 2015, 16:30	#3
the pasty New Member Last Online: Oct 22nd, 2015 21:10 Join Date: Mar 2010 Location: poole	Thanks. There is some oil in the inlet pipe, although there has been a smallish quantity present for the last 80,000 miles, or so, and it is no worse. There is never any smoke from the exhaust in normal day-to-day use - and I do not drive very slowly - excepting yesterday's extreme over-revving events. In any event, I will check for error codes to see if anything has been thrown up. Still curious though why the engine was not limited to a maximum rpm. Doesn't the 2.0d have a rev limiter?

Oct 19th, 2015, 20:17	#4
alfadave11 Senior Member Last Online: Jan 21st, 2016 19:35 Join Date: Sep 2015 Location: wirral	might be of interest 2 nd page put your model in http://www.vosa.gov.uk/vosa/apps/recalls/default.asp

Oct 19th, 2015, 22:05	#5
msh Senior Member Last Online: Oct 15th, 2017 11:57 Join Date: Aug 2010 Location: paignton	Hi If the engine is using oil as fuel. Then the rev limiter will not work. In extreme cases of turbo oil seal failure enough oil gets into the inlet to run the engine at very high revs until some thing breaks. you can turn off the key disconnect the battery and fuel lines and the engine still runs Hope it's something simple and cheap to fix Mark

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