2004 Toyota Prius FAQ - Engine

Gathered from messages posted at the 2004 Prius Yahoo Group: http://autos.groups.yahoo.com/group/2004-prius/

Last updated: 1/7/04

What’s the whirring noise I hear coming from the engine compartment after turning the car off?
My ICE normally shudders a little when it shuts off at a stop light, etc. Is this normal?



What’s the whirring noise I hear coming from the engine compartment after turning the car off?

That's the little electric pump putting coolant into the thermos-type container to keep it hot.  This thermos-type container stores three liters of coolant at close to boiling temperature for up to three days. When the Power button is pressed, hot coolant is injected into the engine coolant passages, avoiding a cold start. This reduces emissions at startup, as well as wear and tear on the engine.


My ICE normally shudders a little when it shuts off at a stop light, etc. Is this normal?

Yes, it is perfectly normal. The system is eking every last bit of power out of the engine as it slows to a stop, pushing the power to the battery, and sometimes it may shudder a bit.






Last modified: Jan 7, 2004
Copyright 2003-4, Bill Robbins, Tom Stangl, Michelle Vadeboncoeur
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