Grumbling noise before/after gas motor runs

eddie27970 · 12-21-2007, 09:01 PM

Had wrote about noises happening before and immediately after gas motor starts and stops. I was under the impression the coolant pump came on about 1 minute after shutdown. My noise happens within 5 to 10 seconds before and after gas motor running and stopping. After posting, I went to reading more and more, and now it seems this coolant pump may also be my problem, unless there is more than one electric motor involved? I still get the other pump noise, just fine, approximately 1-minute after car is off. Is there another electric pump motor? What do I tell the mechanic to check? Thanks

Wonder, it is Federal Law that emission components be covered under warranty for 70k miles. Also saw this in Toyota handbook. This coolant transfer pump could be part of the low emissions system, right? Anyone try arguing this to Dealership, or to Toyota?

And one more question? Assuming it is a bearing going bad, can it be oiled or greased?

Bob64 · 12-22-2007, 07:00 AM

Grumbling noise? I know the brake accumulator pump makes a bit of a buzzing noise...

Is this happening mid-drive or only after turning on/off the car?

12-21-2007, 09:01 PM	#1
eddie27970 Member Join Date: Mar 2005 Location: Eastern North Carolina Posts: 44 My Car: 2005 Prius Model: Package: #7 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Grumbling noise before/after gas motor runs Had wrote about noises happening before and immediately after gas motor starts and stops. I was under the impression the coolant pump came on about 1 minute after shutdown. My noise happens within 5 to 10 seconds before and after gas motor running and stopping. After posting, I went to reading more and more, and now it seems this coolant pump may also be my problem, unless there is more than one electric motor involved? I still get the other pump noise, just fine, approximately 1-minute after car is off. Is there another electric pump motor? What do I tell the mechanic to check? Thanks Wonder, it is Federal Law that emission components be covered under warranty for 70k miles. Also saw this in Toyota handbook. This coolant transfer pump could be part of the low emissions system, right? Anyone try arguing this to Dealership, or to Toyota? And one more question? Assuming it is a bearing going bad, can it be oiled or greased? Last edited by eddie27970; 12-21-2007 at 11:16 PM. Reason: Looks like Troubleshooting has my answer already

12-22-2007, 07:00 AM	#2
Bob64 Sapphire of the Blue Sky Join Date: Apr 2007 Location: Virginia Posts: 1,135 My Car: 2007 Prius Model: N/A Package: #2 Thanks: 3 Thanked 9 Times in 9 Posts Friends: 0	Re: Grumbling noise before/after gas motor runs Grumbling noise? I know the brake accumulator pump makes a bit of a buzzing noise... Is this happening mid-drive or only after turning on/off the car?