today when i shut my car off, i revved it to 2k and turned off the ignition, kept my foot to the floor while it was revving down to let it have a little more air. when it got to about 250 rpms, i heard a metallic scraping sound for about 2 seconds, then the engine stopped with a series of violent shudders. it does this every time i turn it off. any ideas on what this could be?

 

hmm. My car did this last time when I first started it because I was away from home for a month. But it never did it the last 3-4 times I had it running.

Yours sounds like a problem you should get fixed if it happens everytime. Someone should knowwhat this is. But This does not sound good.

 

kinda sounds like it's deiseling, but never rreally heard of it on a FI engine.

 

Yes FI engines CAN diesel. Sounds like maybe a dry bearing scrape?. High pitched squeel? but with the engine still spinning(RPM) there SHOULD be oil flowing. You MIGHT have a semi clogged passage.

 

Why would you shut the motor off at that high of RPM's? Just curious.

 

i was thinking along the lines of a dry bearing, too. i dont get why it only does it for a second or two, and only when it's turning off though.

 

I know when I had many a Carbed motors I would "rev" it right before killing the engine. I found it usually started a little easier. Maybe just a "myth" of carb's.. but it sured seemed to help to me... But FI cars.. not unless you are showing off.. and rev to 2K it not a "high RPM"... 5k is high.. 2K is a tip of the pedal...

 

I would release your foot from pedal. let the engine die. By pressing the pedal down you may have caused a "surge" and the engine tried to rev up... Hense noise.