sudden high engine revs

Hi, i own 1990 90, from time to time it suffers from a sudden engine rev rage and a large cloud of smoke. If i shut engine off it will start as normal and run as normal,any thoughts .

Have you checked for diesel in the engine oil? ...assuming it is a diesel that is!

flossbags said:

Hi, i own 1990 90, from time to time it suffers from a sudden engine rev rage and a large cloud of smoke. If i shut engine off it will start as normal and run as normal,any thoughts .

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sounds like it's running away on it's own oil.

Maybe knowing what engine it is might help us.:doh:

Turbo seals? If it's a turbo that is. You're lucky you can stop it.

Thanks for swift response ,engine is 2.5 turbo

My high revving on my transit was actually a slipping clutch

If its not the clutch then yep it's running away.

Stand back and watch the show! (please note not advisory to stand back and allow your engine to blow up)

[ame=http://www.youtube.com/watch?v=5zx3qKX_Pno&feature=youtube_gdata_player]Runaway Diesel Defender 200 TDI - YouTube[/ame]

Check this anorl!

[ame=http://www.youtube.com/watch?v=3NRaqgab0_w&feature=youtube_gdata_player]RUN AWAY Detroit Diesel! 453-T - YouTube[/ame]

**** me that was close!

Running away???

Can someone educate me? what do i do if it happens to me? im assuming just turning the key wont stop the engine?

If you can't stall it get out and stand back. Although it wouldnt be too hard to make a device to smother the intake (cable operated butterfly or remotely activated fire extinguisher with nozzle in intake somewhere)

BIG_GINGA_BEARD said:

Running away???

Can someone educate me? what do i do if it happens to me? im assuming just turning the key wont stop the engine?

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get out of the car bloody fast!
running away means that an oil seal, e.g. the turbo oil seal, leaks. Thus the engine oil is sucked into the intake and burnt. If you turn off the engine, the fuel solenoid shuts but if the leak is serious enough it will run on on it's own oil until there is none left. As it can be leaking more than there sould be fuel, as it is a doozil, it starts revving to burn the fuel it is being given, thus "running away".

Look at the videos posted.
If it is running away (a seal can let a drop of fuel through, then seal again) I wouldnt drive it.

This happens when stationary, too. If it is clutch slipping, this will happen only on acceleration and is usually rear main seal.

martyc said:

If you can't stall it get out and stand back. Although it wouldnt be too hard to make a device to smother the intake (cable operated butterfly or remotely activated fire extinguisher with nozzle in intake somewhere)

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It'd take quite a strong butterfly valve. They suck stronger than your polish prostitute!

philvy said:

It'd take quite a strong butterfly valve. They suck stronger than your polish prostitute!

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Cost roughly the same too..£7