Prius (2004-09) :: Noise At Start Before ICE Goes On And Splashing Sound


May 5, 2013

Prius makes all kinds of weird and almost funny noises; brake pump, electric motor hight pitch on braking and on ev mode.

I have 4 bare with me-questions:

When I start the car, before the ICE goes on, I hear a noise way back from drivers seat. Sounds like from back seat/trunk area. Sound is kind of pumping, low noise and goes on for maybe 3-5 seconds. Is it the gas pump? I have heard gas pumps before in cars on start and these is quite similar but louder

When I start engine cold(its around 5-10celsius now here on Finland, about 41-50 F), the ICE idles little uneven. RPM seems to be little waving, not much but audible up and down. I aint no expert but the rpm change is not big, maybe changing max 100-200 rounds up and down. Is this normal? My earlier car started cold in higher rpm but did not wave up and down.

Also to do with earlier question; when ICE is still cold( not freezing anyway) the first couple of stops at lights I very clearly feel a shudder. Keeping the brake pedal down and waiting on red light, the car shakes back and forth so that I feel it and even think someone standing outside car might even notice car trembling. Also ICE sounds abnormal at the same time; its not smooth sounding, kind of like misfiring, uneven sounding. Feels like gasoline is just about to go empty or car is stalling. Is this normal in "cold" weather? Heck, its not even below zero C here and car sounds like that.. waiting for winter and it gets -25 Celsius..

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