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post #1 of 5 (permalink) Old 08-07-2006, 05:58 PM Thread Starter
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Default Hearing some funny sound

So, I get in my car and start it up(this is an early morning startup). I start to hear a bubble noise coming from the engine area. This has never happen before unless I have never really notice it. Next, when I'm driving and step on the accelerator, I hear a buzzing noise. It is like a paper is stuck under the car but I checked and it is not that. Any ideas what is going on? should I take it to the dealership or should I wait until my next service which is in a month.

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post #2 of 5 (permalink) Old 08-07-2006, 06:06 PM
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Sometimes I hear things coming from my dash.. and find that its something getting vibrated in the following places:
1) upper dash (sometimes the little plastic shelf comes loose, or something rattles against it)
2) center cup holder -- my cell phone, coins, and other miscellaneous items cause an odd sound that I swear was coming from inside the dash.. but wasn't..

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post #3 of 5 (permalink) Old 08-08-2006, 09:18 AM
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Sometimes rattles can appear to come from a location other than its source. I had CD jewel cases in the console, and they were rubbing together and sqeaking. It sounded like it was coming from the dash over by the windshield.

As stated, there are lots of noises that the Prius makes.
One common misunderstood noise is the brake accumulator pump. Instead of using hydraulic pressure created by your foot (and supplemented by vacuume), hydraulic pressure is created by a pump and stored in a pressurized container. When the car determines that hydraulic brakes are needed, valves are opened that release the pressurized fluid to the wheel cylinders. Another set of valves release the pressure back to the unpressurized reservoir. The pump maintains the pressure as needed. The pump produces a kind of groaning, vibrating noise, much like an aquarium air compressor.

A related noise occurs soon after you shut down the car. About 5 minutes after shutdown, you'll hear a hissing sound for a few secconds, followed by the accumulator pump. I believe this is to try and keep air purged out of the hydraulic lines.

Coolant is circulated through the inverter and transaxle via an electric pump. It should not gurgle, but I suppose if there is trapped air, it might. Trapped air here is not good, as it can cause the inverter to overheat. The pump should be continuously running in Ig-On as well as READY.

Another noise that occurs after shutdown is another coolant pump circulating hot coolant from the engine into the heat storage tank. Sometimes that pump can sound like it has grit in it. I suspect the grit noise might be slight air bubbles. That shouldn't be a problem though.
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post #4 of 5 (permalink) Old 08-08-2006, 02:22 PM Thread Starter
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Actually, I just started to hear another sound. It ticking from the engine when under acceleration. It sounds like a bent valve but I might be wrong. I know it can't be the console, hydraulic pressure from the braking. I am familiar with the strange sounds the prius makes. These are new noises that I have never heard of. Well, thanks for you information, I'm thinking that this could be a major problem. I do tend to drive this car a little hard then I should so. I'll keep you guys updated once I can figure out what is going on under the hood.

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05' Mlillenium Silver Package #4
Mods: OEM RIMS w/o the cap, Broadway Mirrow, unintalled Nokya yellow 9006 Bulbs for the foglamp
Future Mods: PIAA super Yellow bulbs(on Order) 9006, Bride bucket seat, BuddyClub PII 16in
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post #5 of 5 (permalink) Old 08-08-2006, 02:36 PM
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Only occurs when ICE is running, or does it also occur when moving solely under electric power (or both). If sound can occur when ICE not running, it can't be the valves.
Well, since ICE does spin over 42 MPH, I suppose it is possible, but unlikely.
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