Why wont my engine turn off? Even when theres no key in it,?

Question

The only way I can stop it is disconnect the battery, the key is not even in the ignition, Is the starter gone or on? Its a shetland 570, To open the part where the ignition is, is it complicated?

Answer 1

Hi there ...  you have a fault on the ignition switch or the kill switch.

If it was starter run on you would hear a continual grining sound and your starter would be screwed by now.

Ok heres what to try.....  the ignition switch...  if  look behind it you will see the wires ... just check to make sure that the wires are not bear... it could be maintaining a circuit....  ok folow the wires  from the switch  to the engine and check they have not frayed  near the engine ...  these are the wires that go to the engine and not to the starter....  if you find one has frayed ...  it will keep the circuit open even when yo have the  key turned off..   (  the wire is usually black and yellow which causes the problem.) they can also go to the selonoid behind the starter  .. thus they dont put power through the starter....

Good luck...

Answer 2

Hi,

As this is a motor boat better hand the job to a  qualified electrician.

Good luck

Answer 3

Since it stops when you disconnect the battery, run on or "dieseling" can be discounted.  I would look to a faulty ignition switch or bad coil ground wire first.

Answer 4

ignition switch will have to be replaced. too bad bud.

Answer 5

Aha! 2 stroke engine sounds almost certain to be "run on".

What happens is that carbon deposits have built up in the combustion chamber which glow red hot. These hot deposits can ignite the fuel air mixture entering the cylinder & cause ignition without needing a spark.

Short term solution is to starve the engine of fuel and or air which will stop it from running, long term solution get the engine "de coked" the cylinder head will need to be taken off & the carbon deposits removed by suitable means.

The same effect can also be caused by using a spark plug of the wrong temperature range which can glow red hot at the tip.

http://en.wikipedia.org/wiki/Pre-ignitio...

Answer 6

it might be a 2 stroke, but your timing is out,not hard to fix. its called pr e ignition

Answer 7

if it is a diesel engine your fuel shut off valve might be at fault i would check this before checking ignition wiring p.s. not the starter