Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - nairb356

This happened with a Peugeot Boxer -Based camper but is relevant to any turbo diesel

on the motorway last wednesday cruising at 65mph after returning from France in Boxer-based camper
everything running very smoothly.....van has 19000 miles on original engine (engine is Peugeot 2.2Litre diesel 2008).

all of a sudden engine started Missing, say 10 times, then power dropping, started to smoke out exhaust
pulled into hard shoulder
switched off engine
as soon as I switched it off engine started to runaway at absolute max revs - very black smoke
Let out the clutch in gear and stopped it after max 2-3 secs (FRIGHTENING!)
all the above happened in less than 1 minute, no warning lights showed. Towed to Garage!

in the garage:
the EGR valve is showing as coked up and stuck, diagnostics are pointing to EGR problem
2 years ago EGR was also coked up and engine mgmt lite came on.

It seems likely that the problem was caused by turbo seals weeping on inlet side causing EGR to slowly coke up( note had coked perviously),

followed by instantaneous full failure of turbo seals on Motorway leading to runaway?

Has anyone any experience of this? Im anxious as hope to head away again late August and wouldnt like a repeat performance!!!!

Thanks
Brian

Edited by nairb356 on 19/08/2013 at 14:52

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - unthrottled

It's a well known potential problem with any turbo diesel.

The coked EGR is a symptom of the problem of the leaking oil seal rather than a problem in itself.

If a turbo engine suddenly starts to use oil and there's no obvious leak it takes but a few minutes to check the hoses from the turbo for excessive oil....

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - nairb356

Thats what I was thinking - that the coked up EGR was a symptom!

I didnt notice any oil getting used - but might have been a very slow weep over a long time before the catastrophic events described!

Edited by nairb356 on 19/08/2013 at 15:17

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - RT

It's a well known potential problem with any turbo diesel.

The coked EGR is a symptom of the problem of the leaking oil seal rather than a problem in itself.

If a turbo engine suddenly starts to use oil and there's no obvious leak it takes but a few minutes to check the hoses from the turbo for excessive oil....

I thought it was a well known potential problem on any diesel, turbo or not ? From long befor EGRs were in use.

Since diesels don't have a throttle unlike a petrol, any significant leak of oil into the intake tract simply provides fuel for the engine which runs accordingly.

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - madf

5 year old diesel with 19,000 miles.

The low mileage is the problem. Well known...

Edited by madf on 19/08/2013 at 16:29

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - Collos25

5 year old diesel with 19,000 miles.

The low mileage is the problem. Well known...

Old wives and HJ foibble not actually true.

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - unthrottled

True. An overfilled sump can force enough oil past the rings which causes the same problem. Fortunately, true runaways are quite rare on 4 stroke engines (not much consolation to the OP though!). The problem was sufficiently common on 2 stroke diesels that an emergency air shut-off was often fitted as standard.

Since most pasenger car diesels come fitted with anti-shudder valves, I don't understand why the OEMs don't program the anti-shudder valve to automatically close if implausible MAF or boost values are reported. There wouldn't be any hardware cost.

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - focussed

It's a well known potential problem with any turbo diesel.

The coked EGR is a symptom of the problem of the leaking oil seal rather than a problem in itself.

If a turbo engine suddenly starts to use oil and there's no obvious leak it takes but a few minutes to check the hoses from the turbo for excessive oil....

I thought it was a well known potential problem on any diesel, turbo or not ? From long befor EGRs were in use.

Since diesels don't have a throttle unlike a petrol, any significant leak of oil into the intake tract simply provides fuel for the engine which runs accordingly.

Wrong - Both of my rattlers have a throttle butterfly!

Peugeot 2.2 Diesel - Runaway Peugeot 2.2 Diesel - unthrottled

Wrong - Both of my rattlers have a throttle butterfly!

Pedant! They do use mild throttling for DPF regens and to provide a pressure drop for the EGR to work, but they can't choke airflow like petrols otherwise compression ignition wouldn't work!

Edited by unthrottled on 20/08/2013 at 00:27

 

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