Adrian wrote:
On the subject of Moggies - anybody know why mine has a tendency
to 'run on' for a few seconds after the ignition has been switched
off? Somebody told me it was to do with the unleaded fuel - she's
originally a leaded engine that the Morris Minor Centre in Bristol
'unlead-ised' with the aid of a 'magic' thingy that fits in line with
the fuel - apparently they've been fitting them for 20 years..


I had a similar thing with my Metro which also used the A series engine.
I was told that it was 'Dieseling' and that this was caused by carbon
build up on the cylinder which heated up to the point where it would
ignite the compressed mixture without a spark (in the same way that a
Diesel engine works). So after turning off the ignition and depriving
the engine of a spark it would continue to ignite and hence 'run on' for
a short while.

There are however people on this group much more knowledgeable about
cars than me and I am sure they will be along in a moment.

Andrew