over-run when ignition turned off
 

hi there,

my car has developed a slightly embarrassing trait. when i turn it off the engine continues for one last gasp ending with a noticeable judder as it finally dies.

does anyone know what causes this and how i can fix it. i have a thick skin but for some reason i find this new behaviour rather embarrassing.

it makes my lovely car sound like an old banger, and i can't be having that!

many thanks in advance, as always, for all your help.

justin

When I was a kid, 12-14 years old, my father who had a garage used to let me drive cars behaving as yours until I burnt away all the soot..., normally the top speed in the beginning of the session was 80 km/h and in the end almost twice.
In your case it is probably one or two bad spark plugs, but if they´ve been bad for long you also have got a soot layer in the cylinder head. Normally it is a combination of both causing the motor to continue to run some laps.

The reason behind all this, refering to my childhood, was a too rich mixture and sometimes too little reving...

If your plugs looks clean and fine, I am totally wrong...
L.