When i take my key out, my engine continues to run for around 10 seconds sometimes only a couple of seconds.

Anyone got any ideas why this happens, apart from overfueling?

Anyway was thinking of fitting a kill switch where would be the best place to kill the power? all the lives? all the negitives? the ecu power, the alternator? my wirings been butchered by a few people so its a little short in places so id like to get ideas before i start cutting.

Had this problem a couple of times on different cars seems that the alternator car sometimes because of the way it is wired back feed and keep the engine running,to stop it happening you need to fit a diode in the alternator charge light cable the one from the alternator.
http://www.gtmdrivers.com/forum/gtm-seperate-instruments-t807.html
Matty

does it only happen when the cooling fan is on, if not then i'd be thinking about putting a diode on the ign light wire that comes from the alt.

Cheers
Rich

If it's running on (as in still firing poorly with no spark) then it's often a case of to high an idle speed or needs the timing retarding a little bit or possibly a cooler plug might help. If it's still got a spark (would normally just keep running) then it's likely a back feed from the alternator or poor wiring setup.

Well wiring was from a loom supplyed by mnr - ill try the diode trick. can i just put it near alternator on the charge light wire?? and what direction?

Stick a volt meter on the LT (Feed side of the coil).
Start and run engine.
Switch off and see if there is still a voltage present on the LT side of the coil.
This will tell you if its an electrical problem or not.

If the voltage remains present when the key is turned off, then its electrical.
IMHO you should not need a diode in the ign light wire if its wired and working correctly. You could simply have a faulty alternator.
Disconnect the ign warning light (remove bulb) to see if its feeding back (ie check as above with the meter), before just sticking in a diode and hoping it will fix it.

If not its a running problem, ie weak mixture, over fueling, wrong plugs etc etc.

ie analyse and isolate the problem first, rather than "Poke and Hope" fault finding.

Be methodical, and find the cause first then fix it.
Make one change at a time, and keep notes. Or you will not know what you have done.
Just making changes and hoping to fix it will give rise to other problems that you may not have had before you started changing things.

Have fun!

Cheers i give that a whirl, well i just payed MNR for a new alternator so ill take a look 2mora

quote:

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Originally posted by wilkingj
Stick a volt meter on the LT (Feed side of the coil).
Start and run engine.
Switch off and see if there is still a voltage present on the LT side of the coil.
This will tell you if its an electrical problem or not.

If the voltage remains present when the key is turned off, then its electrical.
IMHO you should not need a diode in the ign light wire if its wired and working correctly. You could simply have a faulty alternator.
Disconnect the ign warning light (remove bulb) to see if its feeding back (ie check as above with the meter), before just sticking in a diode and hoping it will fix it.

If not its a running problem, ie weak mixture, over fueling, wrong plugs etc etc.

ie analyse and isolate the problem first, rather than "Poke and Hope" fault finding.

Be methodical, and find the cause first then fix it.
Make one change at a time, and keep notes. Or you will not know what you have done.
Just making changes and hoping to fix it will give rise to other problems that you may not have had before you started changing things.

Have fun!

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