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Author Topic: Tire Pressure?  (Read 17469 times)
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tomme12
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« on: September 26, 2010, 11:37:03 PM »

I had my tires rotated at Tires.com places and they must have to changed my pressure all to 31.  I got my onstar report saying my tire pressure was "low" from 35 to 31 psi.

Anyone know which is correct?
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andylibby
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« Reply #1 on: September 27, 2010, 12:45:12 AM »

Tire pressure probably varies depending if the car has 17", 18", or 20" wheels.  The correct tire pressure for your vehicle is on a sticker at the driver's door jam. 

My Traverse has 20" wheels and the sticker specifies 35 psi at all four corners.  Also, that's COLD pressure.  I check mine sometimes at 35-36 for all 4 tires when I first get in the car and again a half hour later and get readings of 37-38 in heated up tires.  Ambient temperature, road surface, and road temperature all affect the amount the temperature increases while driving.

Good luck.
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« Reply #2 on: September 27, 2010, 02:21:41 AM »

If Onstar is saying your pressure is low, it's a fact.  35 is the pressure.

Bob
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rbarrios
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« Reply #3 on: September 27, 2010, 12:35:41 PM »

yes- 35 should be it.
like he said-
Look at your drivers door- theres a decal with the air pressure.
Take air pressure readings- when tires are cold. (morning- after cars been sitting).

But I want to point something out---
you said they rotated your tires....
Unless they looked somewhere for the specs---- I doubt they torqued the lug nuts to spec. (anyone know if tire places like these look up values?-- or they just use an impact wrench and tighten them on)

I would really consider buying a Torque wrench- and tightening them to specs.

The concern is that they over torqued- or put diff amounts of torque on each lug nut--- this-- leads to the rotors Warping...
which gives you the steering wheel shake-- and pulsating of the brake pedal.

I would invest in one--- and loosen them-- and tigheten them up to spec.
It could save you the trouble of the rotors (which from what I hear- are thin- and turning them is almost impossible)---- meaning youd need to get new ones to get rid of the vibration


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« Reply #4 on: September 27, 2010, 01:18:00 PM »

OnStar get the reading at night when you tires are cold I gotten two notices saying my pressure is low when I check it during the heat of the day it's fine.
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tomme12
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« Reply #5 on: September 27, 2010, 02:33:59 PM »

I checked with Wheel Works and they said they torque to specs.
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« Reply #6 on: September 27, 2010, 02:45:36 PM »

OnStar get the reading at night when you tires are cold I gotten two notices saying my pressure is low when I check it during the heat of the day it's fine.

Ive noticed that about every 30 days- Onstar- runs the 'check'- 1st thing when you turn on your car in the AM.

Im at work- and ill get an email about 830- with the pressure readings from her car- since she leaves to work- after me in most cases.
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« Reply #7 on: September 27, 2010, 02:48:32 PM »

I checked with Wheel Works and they said they torque to specs.


Cool.
I wonder if they use something like ALLDATA for the specs.
Ive been told that some places use special attachments that bend when they reach a certain torque.
They are color coded apparently.

But many tire places Ive never seen them dial up a particular torque....
I just see the guy go at it--- brrrrr--- brrrrrr-  brrrrrr   ---  you know that tire shop sound.
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« Reply #8 on: September 27, 2010, 06:59:11 PM »

OnStar get the reading at night when you tires are cold I gotten two notices saying my pressure is low when I check it during the heat of the day it's fine.

Onstar doesn't get my pressure readings at night ...... the Traverse is garaged and there is no signal in the garage.

Bob
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« Reply #9 on: September 27, 2010, 10:35:31 PM »

The other thing to remember is that when your tires are rotated, the sensors inside the wheels that transmit pressure to the TPMS change places. 

They have to be reset so the system knows which sensor is at which corner.
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« Reply #10 on: September 27, 2010, 11:03:55 PM »

Dislike technology.     So what is the process to reset this system or do I really need the "special" tool?   Or to the dealer I go? I cant believe they dont have something on the dash to do this...
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« Reply #11 on: September 27, 2010, 11:23:07 PM »

I've gotten my tires rotated 3 times: twice at the dealer and once while on a road trip at NTB. I mentioned resetting the sensor locations all three times and was told that resetting them was included in the price of the rotation. 

I guess since all new cars are required by law to have some type of TPMS, service facilities are becoming versed on how to deal with them.
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« Reply #12 on: September 27, 2010, 11:25:22 PM »

Id have to assume that wheel works or tire rack, etc would be reseting the computers as well. I will call them tomorrow.   Nice guys though, my old Jeep, bought a couple sets from them and the roadside/rotation package....  told them I sold the jeep, and said no problem....  we will change the vehicle and rotate your Traverse for free.
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« Reply #13 on: September 28, 2010, 06:49:15 AM »

Dislike technology.     So what is the process to reset this system or do I really need the "special" tool?   Or to the dealer I go? I cant believe they dont have something on the dash to do this...

It can be done either by a scan tool (assuming the GM one), or the procedure to do it manually is in the owners manual.

The TPMS sensor matching process
is outlined below:
1. Set the parking brake.
2. Turn the ignition switch to ON/RUN with the engine off.
3. Press the Remote Keyless Entry (RKE) transmitter's LOCK and UNLOCK buttons at the same time for approximately five seconds. The horn sounds
twice to signal the receiver is in relearn mode and TIRE LEARNING ACTIVE message displays on the DIC screen.
4. Start with the driver side front tire.
5. Remove the valve cap from the valve cap stem. Activate the TPMS sensor by increasing or decreasing the tire's air pressure for five seconds, or until a horn
chirp sounds. The horn chirp, which may take up to 30 seconds to sound, confirms that the sensor identification code has been matched to this
tire and wheel position.
6. Proceed to the passenger side front tire, and repeat the procedure in Step 5.
7. Proceed to the passenger side rear tire, and repeat the procedure in Step 5.
8. Proceed to the driver side rear tire, and repeat the procedure in Step 5. The horn sounds two times to indicate the sensor identification code has been
matched to the driver side rear tire, and the TPMS sensor matching process is no longer active. The TIRE LEARNING ACTIVE message on the
DIC display screen goes off.
9. Turn the ignition switch to LOCK/OFF.
10. Set all four tires to the recommended air pressure level as indicated on the Tire and Loading Information label.
11. Put the valve caps back on the valve stems.
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rbarrios
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« Reply #14 on: September 28, 2010, 11:31:42 AM »

Dislike technology.     So what is the process to reset this system or do I really need the "special" tool?   Or to the dealer I go? I cant believe they dont have something on the dash to do this...


Instruction are in the manual....
But yes- you can reset the location via the DIC.
You do have to get to the menu- and then let air out of the tires .....
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« Reply #15 on: September 28, 2010, 12:45:32 PM »


Ive been told that some places use special attachments that bend when they reach a certain torque.
They are color coded apparently.

This is what almost every tire shop, who does tires several times on a daily basis, uses for torque to speck settings. Those "attachements" are called torque sticks. They come in different sizes, hence the color choices. Then each stick is set to bend just enought to kick back against an impact wrench for it to quit tightening. For example, the 22mm torque stick is 140 ft. lbs ( If I remember correctly ) and the 25MM is more, which would be for bigger trucks, etc.
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« Reply #16 on: September 28, 2010, 01:18:25 PM »

I grabbed one for both of my vehicles and bring it with me if I ever get any work done by a shop.

http://www.princessauto.com/search-products?keyword1=torque+bar

At home, I use a torque wrench.  I've had warped rotors from trigger happy hired-help that like the sound of their air gun.  So end up redoing it by hand after getting back home.
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rival22
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« Reply #17 on: September 28, 2010, 01:22:13 PM »

But many tire places Ive never seen them dial up a particular torque....
I just see the guy go at it--- brrrrr--- brrrrrr-  brrrrrr   ---  you know that tire shop sound.

Probably 5 years ago I got new tires at a Firestone shop on a car that I used to have... like 6 months later, I went to rotate the tires and they cross threaded one of the lugnuts. I ended up having to break the stud and put a new one in. I was  flaming mad

If I had a flat and had to change that tire on the side of the road, I'd be up a creek... all because of a lazy, careless worker putting the wheel back on.
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« Reply #18 on: September 28, 2010, 01:30:26 PM »

I've always double checked the torque after getting new tires.  I've had it happen 3 times where a lug was cross-threaded on and I go right back and have them change out the stud.  It's definitely worth checking, because it isn't easy breaking off the stud by hand if you're doing an emergency tire change.
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« Reply #19 on: September 28, 2010, 02:21:51 PM »

Recheck the lug nut torque after having put a 100 miles or so on the odometer.  You may find it has loosened up a bit.  Unlikely at 140 lb-ft but you never know.
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