i have an 03 s2000 with 48Kmiles and was wondering if it was normal for the car to diesel (or at least thats what it was called when my MR2 did it) when i turn off the car. after warm the car idles at 1000k rpm and i turn it off and notice that the motor shakes as the motor dieselerates as it is being shut off. in my mr2 it was because the idle was set to high and also to some loose motor mounts. let me know what you all think.

 

leaky injectors?

Never seen a FI car diesling, only carbureted.

 

Dieseling is when the engine doesn't want to shut down and runs for several seconds or longer. An S2000 that shakes momentarily before shutting down is not unheard of.

 

alright. . . i havent had the car for more than 6-7 months so im not completely accustomed to all its weird ticks and trademark finacles, let me know if anyone has any other ideas or comments

 

, normal.

Mine "shudders" when you switch it off. It is however only momentary, maybe 1 second count. I would think the cause is obvious, they don't like to be turned off.

 

^ same as above, i noticed this to right away, when i shut my MY01 off, it shakes for no more then 1 second as the engine stops running

 

You're not running 87 octane, are you?

 

my engine kinda "shimmy's" when i shut it off too, run on premium fuel, MY00 33000 miles

 

i also run premium (93 octane) ihave 36000 miles

 

Mine has 93000 miles on it. It doesn't shut down immediately (and has a distinct feel to it when it's keyed off) but it sure as heck doesn't diesel.

I think you might not really be familiar with dieseling. I had an old crusty firebird that dieseled when it shut off... it would run on its own for a got 10 seconds. THAT's dieseling.