Grating Sounds from Front

jimklausner · 01-28-2007, 01:12 PM

My 2007 Prius has 2300 miles on it. When shifting from Park to Reverse, and from Reverse to Drive, I am hearing a grating sound briefly from front of car at time that I make the shift change. This is not the sound of the disk brakes, because during the shift changes, I have my foot firmly depressing the brake pedal. I am planning on taking the car to my local Toyota dealership's service center tomorrow. But I ask if anyone else has hear such a sound, or has an opinion as to the cause(s)?

jamarimutt · 01-28-2007, 04:18 PM

<div class='quotetop'>QUOTE(ConnecticutYankee @ Jan 28 2007, 02:12 PM) [snapback]381967[/snapback]</div>

Quote:

My 2007 Prius has 2300 miles on it. When shifting from Park to Reverse, and from Reverse to Drive, I am hearing a grating sound briefly from front of car at time that I make the shift change. This is not the sound of the disk brakes, because during the shift changes, I have my foot firmly depressing the brake pedal. I am planning on taking the car to my local Toyota dealership's service center tomorrow. But I ask if anyone else has hear such a sound, or has an opinion as to the cause(s)?
[/b]

When you hear this sound, is the wheel turned to one side and the car has started moving?

jimklausner · 01-28-2007, 05:45 PM

<div class='quotetop'>QUOTE(jamarimutt @ Jan 28 2007, 04:18 PM) [snapback]382023[/snapback]</div>

Quote:

When you hear this sound, is the wheel turned to one side and the car has started moving?
[/b]

Thank you very much for your question and interest in my situaiton.
No, in all cases, front wheels have been straight ahead, and the sound happens before the car moves. The grating sound is brief, just a spike if it were being graphed. In my ignorance, I have been wondering if there is "slack" in the suspension that is being taken up when I shift the drivetrain out of Park into Reverse, and out of reverse into Drive.

galaxee · 02-02-2007, 11:26 PM

hmm. that's all electric. get thee to a dealer.

jimklausner · 02-04-2007, 07:51 PM

<div class='quotetop'>QUOTE(galaxee @ Feb 2 2007, 11:26 PM) [snapback]384756[/snapback]</div>

Quote:

hmm. that's all electric. get thee to a dealer.
[/b]

Wow! Your note was unsettlilng, to say the least. I will be phoning dealer's service center tomorrow to have the noise checked. Can you give me background behoind your assessment that my problem is electric?

Thank you.
Connecticut Yankee

hobbit · 02-04-2007, 09:45 PM

Well, how brief is brief? There is a certain amount of gear lash
in the drivetrain, and the whole engine/transaxle rocks a little
bit against its mounts when the torque changes... perhaps if you
chock the car with the E-brake on and have someone shift back and
forth while you cruise your ears around under the hood and try to
localize it...
.
Sometimes as I transition from regen to taking off, I hear a very
subtle klunk under there; hasn't gotten any worse/better/different
in all this time so I generally ignore it.
.
_H*

Bill Merchant · 02-05-2007, 01:06 AM

<div class='quotetop'>QUOTE(ConnecticutYankee @ Feb 4 2007, 04:51 PM) [snapback]385307[/snapback]</div>

Quote:

Wow! Your note was unsettlilng, to say the least. I will be phoning dealer's service center tomorrow to have the noise checked. Can you give me background behoind your assessment that my problem is electric?

Thank you.
Connecticut Yankee[/b]

I think Galaxee just meant that the power steering is electric. On a conventional car, the ICE always runs a pump to provide power steering. On a Prius, the power steering is electric.

Let us know what the dealer says. If there are any diagnostic codes recorded, please try to find out what the numbers are. Good luck!

galaxee · 02-05-2007, 10:06 AM

i'm pretty sure he meant that the shifting mechanism is electric. of course, this was a couple days ago now and a lot has happened since that's more prominent in my mind. there is no clunking noise when we shift our prius from any of those modes. just the parking pawl noise when going in our out of park.

at any rate, there's not much anyone here can do without seeing the car, so your best bet is the dealer.

jimklausner · 02-05-2007, 11:39 AM

<div class='quotetop'>QUOTE(galaxee @ Feb 5 2007, 10:06 AM) [snapback]385515[/snapback]</div>

Quote:

i'm pretty sure he meant that the shifting mechanism is electric. of course, this was a couple days ago now and a lot has happened since that's more prominent in my mind. there is no clunking noise when we shift our prius from any of those modes. just the parking pawl noise when going in our out of park.

at any rate, there's not much anyone here can do without seeing the car, so your best bet is the dealer.
[/b]

Just returned from dealer's service center. Went for drive with technician who tried everything. No noises. Then car taken into center proper for examination of underside, etc.. while I waited in lounge area. Again, nothing found. Servce technician had said if noise still occurs, bring car back to leave overnight for checking for noise next morning. After car had been examined in the service center's garage area, it was parked outside in front of service center, awaiting completion of warranty paperwork. Guess what, when I got into car and put transmission from Park to Reverse, the noise was heard. I decided to skip going back inside, and went home with the idea that if noise continues, I will return car and leave it overnight.

richard schumacher · 02-06-2007, 11:16 AM

When you park, do you set the parking brake (the pedal at the far left) before shifting to P? If you do not use the parking brake you may be hearing the parking pawl scraping.

If you do use the parking brake, when about to move do you press the center brake before releasing the parking brake, and do you keep the center brake pressed when shifting from P to D?

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01-28-2007, 01:12 PM	#1
jimklausner Connecticut Yankee Join Date: Nov 2006 Location: New Milford, CT Posts: 44 My Car: 2007 Prius Model: Package: #6 Touring Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	My 2007 Prius has 2300 miles on it. When shifting from Park to Reverse, and from Reverse to Drive, I am hearing a grating sound briefly from front of car at time that I make the shift change. This is not the sound of the disk brakes, because during the shift changes, I have my foot firmly depressing the brake pedal. I am planning on taking the car to my local Toyota dealership's service center tomorrow. But I ask if anyone else has hear such a sound, or has an opinion as to the cause(s)?

02-02-2007, 11:26 PM	#4
galaxee resident lab rat Join Date: Mar 2005 Location: boilermaker territory Posts: 9,675 My Car: 2005 Prius Model: N/A Package: #5 Thanks: 0 Thanked 94 Times in 37 Posts Friends: 26	hmm. that's all electric. get thee to a dealer.

02-04-2007, 09:45 PM	#6
hobbit Senior Member Join Date: Mar 2005 Location: Bahstahn Posts: 3,625 My Car: Model: Package: Thanks: 0 Thanked 216 Times in 118 Posts Friends: 0	Well, how brief is brief? There is a certain amount of gear lash in the drivetrain, and the whole engine/transaxle rocks a little bit against its mounts when the torque changes... perhaps if you chock the car with the E-brake on and have someone shift back and forth while you cruise your ears around under the hood and try to localize it... . Sometimes as I transition from regen to taking off, I hear a very subtle klunk under there; hasn't gotten any worse/better/different in all this time so I generally ignore it. . _H*

02-05-2007, 10:06 AM	#8
galaxee resident lab rat Join Date: Mar 2005 Location: boilermaker territory Posts: 9,675 My Car: 2005 Prius Model: N/A Package: #5 Thanks: 0 Thanked 94 Times in 37 Posts Friends: 26	i'm pretty sure he meant that the shifting mechanism is electric. of course, this was a couple days ago now and a lot has happened since that's more prominent in my mind. there is no clunking noise when we shift our prius from any of those modes. just the parking pawl noise when going in our out of park. at any rate, there's not much anyone here can do without seeing the car, so your best bet is the dealer.

02-06-2007, 11:16 AM	#10
richard schumacher Destination: Eschaton Join Date: Mar 2004 Location: United States Posts: 5,510 My Car: 2004 Prius Model: N/A Package: #6 Thanks: 99 Thanked 93 Times in 66 Posts Friends: 0	When you park, do you set the parking brake (the pedal at the far left) before shifting to P? If you do not use the parking brake you may be hearing the parking pawl scraping. If you do use the parking brake, when about to move do you press the center brake before releasing the parking brake, and do you keep the center brake pressed when shifting from P to D?