keep running

[horrace]

Hi, why would horrace keep running for a second or two after I switch the ignition off, its only just started happening...

[dalebrignall]

i think its called running on ,something to do with unburnt fuel in the cylinders not being burnt im sure bmc will tell us more about it ,my old engine used to do this .

[chrisryder]

too rich, too high a tickover, or carbon in the combustion chamber glowing and acting as a spark plug.

Check the colour of the plugs.

[moggiethouable]

I suppose the question is, when was it last serviced?

[bmcecosse]

As above - something is glowing red - hot enough to ignite the mixture and keep it running. Too rich - or badly retarded ignition timing.

[simmitc]

And with the wonder that is the messageboard, a world of total harmony and agreement...
Ignition timing too far advanced. Air leak in manifold leading to a weak mixture.

[horrace]

ok, well i showed you my spark plugs a couple of weeks back and they were a good colour so everyone said!. so i think maybe i need to advance the timing a bit more, ive not got it quite right since the garage fannied around with it and messed it right up, when it left the garage it was constantly back firing after they retarded the ignition too much.
ive not done points gap for a while? would this make a difference?
also fuel pump seems to be ticking more?
and the condenser is over a year old... last one only lasted a year!?Q

[horrace]

AND....... i think it is tooo rich at tickover as it does run toooo fast no matter how much i reduce the idle setting.only way i can get it to tick over slower is to force the jet assembly doofa right back up by hand

[bmcecosse]

Running on is not caused by advanced ignition timing - that just leads to pinking and holes in the pistons..... Retarded timing leads to running hot - and glowing 'bits' in the combustion chambers.

[horrace]

and the points and condensor issues?

[JOWETTJAVELIN]

and the points and condensor issues?

If it ain't broke don't fix it... rub the points down to the nubs and the condensor will run for many more years.

As others have said, the running on will be bad timing (or maybe you need a decoke?) as it happened to an engine I had which ran on for about 10 secs. Timing adjusted = running much smoother.

[horrace]

ok thanks ill advance the timing a bit more then..

[bmcecosse]

Advance till you get a little pinking - then retard very slightly.

[horrace]

yes thats what i will do. thanks. just wondered why it was doing it, since i have been driving the pick up for the last few weeks and its only just started doing it, maybe a buld up of carbon then due to unburnt fuel?

[bmcecosse]

Could be - and possible change of timing due to points wear.......

[simmitc]

And another thing to check is whether it's too hot. An overheated unit will run on.

[horrace]

So may be better to replace my 92 thermostat with an 82 then?

[bmcecosse]

For summer -yes, probably.