dthondatune

Anybody have some input on this? Whenever I come to a stop, and turn the ignition to the off position, the engine "shutters" right before turning off.
Almosty feels like I have a bad motor mount.

Is this normal?

globallyoff

It's normal.

Stephenopoly

normal.

ApexMotorPro

yea.... its normal!

dthondatune

Thank you!

WarrenW

Not to raise your fears, but I don't and have never had that problem. I did have some sort of vibration while the car was at idle, turns out, it was a broken engine mount. You might want to have them checked.

I had an MGB that shuttered when I shut it off and it turned out to be an ignition relay (damn Lucas electronics).

Waren

mikegarrison

This is called "dieseling". It's when the engine is still hot enough and the compression is still strong enough for a few self-detonations to occur even though there is no spark.

shotiable

good to know i'm not the only one that was worried about that... for the first 2 months when i bought the car i was getting irritated coz the engine didnt stop immediately after i turned it off...

TJF

The post on "dieseling" is correct

I also imagine it is a factor of balancing an engine to run 9000rpms. In order to balance it out at that high a frequency, the balancer has to give up a little bit below 1k rpms. Therefore, the engine actually goes out of balance as you shut it off causing the short vibration period.

milkbubble

High compression might also be a factor for the sudden shake when the engine stops.