Dieseling?

[Squigglebit]

I have recently acquired a 2005 Ssangyong Rexton.
Drives and starts absolutely fine.
Yesterday I drove an extremely short distance to a supermarket from my place of work en route home (less than a minutes drive) and experienced Dieseling when I stopped. This was the first time the car had done this.
Today again I drove even shorter distance from my work to local pet shop to collect several 30kg bags of feed and again dieseling.
The car does not do this if I drive a “normal” distance. Only excessively short ones.
It will start up again with zero issues.
Any thoughts?

[Tired]

I presume it's fuel injected, given its age?

I've never heard of a FI car dieseling before. Carbs, yes, hence anti-dieseling solenoids.

[roverspeed]

Could be running on oil leaking from the Turbo seals?

[Tired]

That sounds more like a runaway type thing?

OP, for clarity, are we talking about a petrol or diesel engine here?

Dieseling is something which affects petrol engined cars.

You got the 3.2 straight 6 merc engine?

[Squigglebit]

2.9 diesel

[GreenV8S]

Squigglebit said:

2.9 diesel

Don't know how it works on these new fangled things, but back when diesel engines were stopped by a simple manual fuel cut-off valve this could happen if the valve leaked or wasn't fully closed. Nowadays I suppose it could also happen if the crank case breather, EGR valve or turbo were somehow allowing fuel mist into the intake.

[annodomini2]

It's common rail, so should cut fuel at ignition off.

One of 2 things:

1. It's burning something other than fuel.
2. It's not turning off the injection system.

First one is probably something mechanical.

Second one is probably electrical.

Get a fault code read out and work from there.

[Squigglebit]

Quick update.

Only happens when engine is cold.

[Tony1963]

OP,

When you say 'dieseling when stopped', do you mean 'running on'? As in, you turn the engine off but it runs for a few seconds after that?

[Squigglebit]

Yes

When I googled it I was told this was “dieseling”

[Emanresu]

Either your stop solenoid is faulty or the vacuum lines connecting to it are old and deteriorating and collapsed. Either way, it’s an easy fix. Go to a proper mechanic and ask him about these 2 faults and he can figure it out.

[Gary C]

Squigglebit said:

Yes

When I googled it I was told this was “dieseling”

Dieseling also applies to collapsing of vapour bubbles in oil causing compression ignition of the oil as the faces of the void strike each other. Causes our Fire Resistant Fluid to go black after a while.