Tire pressure ques. - Mercedes-Benz Forum

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post #1 of 17 (permalink) Old 08-11-2007, 01:48 PM Thread Starter
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Tire pressure ques.

2005 SL 500 stock wheels 18" and tires. Had been running 32lbs in all 4 and read owners manual which said 26 lbs front and 29 lbs rear. Adjusted all and now red tire pressure low warning light is on. What should I do?? Thx!
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post #2 of 17 (permalink) Old 08-11-2007, 07:23 PM
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I run 32 Front & 35 Cold, I believe 26 and 29 is too low unless you like to replace tires fast. In any case you need to reset the tire pressure monitor per owners manual. That will establish a baseline for your tire pressure.
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post #3 of 17 (permalink) Old 08-11-2007, 07:37 PM
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def reset tire pressure monitor. it may take a couple of tries to lock in at the new pressure. if the light keeps coming on you may need to take to dealer to set tech tire pressure monitors to the new level. in computer it reads a kph not psi. make sure they set it coreectly then have them reset tpm and test drive. i see it all the time at my shop
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post #4 of 17 (permalink) Old 08-11-2007, 09:45 PM
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You may want to ensure you're using an "accurate" tire pressure gauge. I have several in my garage that read all over the map and one that is accurate to within 1.2 PSI from 15 to 45 PSI.

Tires are expensive. Spending $20 to get an accurate gauge is money well spent.
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post #5 of 17 (permalink) Old 08-11-2007, 10:12 PM
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I run 32 to 35 psi front and back because that is what Luke at the Tire Rack recimmended I run, summer and winter tires. But my Operator's Manual says 29 and 32 front and back.

Don't believe everything you think
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post #6 of 17 (permalink) Old 08-12-2007, 09:36 AM
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If you set the tire pressure monitoring system on hot afternoon, the pressure will drop on cold night and will trigger the alarm in the morning. That might be the case?
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post #7 of 17 (permalink) Old 08-12-2007, 09:44 AM
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Quote:
Originally Posted by Kajtek1
If you set the tire pressure monitoring system on hot afternoon, the pressure will drop on cold night and will trigger the alarm in the morning. That might be the case?
Tyre pressure does change a lot with temperature but the sensors should know this and then a temp change should not trigger a warning.

But did you (funnyguy I mean) reinitialize the system after adjusting the tyre pressures? The point with the system is that you first set the tyre pressure to whatever you want and then set the tyre pressure monitoring system to watch after that temperature. They don't watch after the recommended pressure in the car manual.

(OK, I see the reset was mentioned already in an earlier post, sorry for repeating).
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post #8 of 17 (permalink) Old 08-15-2007, 09:22 AM
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Interesting discussion guys.

I have learnt something I didn't know.

Keep up the good works.

Peace!!!
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post #9 of 17 (permalink) Old 08-19-2007, 10:56 PM
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[QUOTE=Diesel Benz]Tyre pressure does change a lot with temperature but the sensors should know this and then a temp change should not trigger a warning.

If you use Nitrogen instead of air into your tyres, the pressure will keep steady besides the temperature.
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post #10 of 17 (permalink) Old 08-19-2007, 11:11 PM
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[QUOTE=argenjagd]
Quote:
Originally Posted by Diesel Benz
Tyre pressure does change a lot with temperature but the sensors should know this and then a temp change should not trigger a warning.

If you use Nitrogen instead of air into your tyres, the pressure will keep steady besides the temperature.
Argenjagd
This is new to me, at school I learned that the pressure*volume/temperature is constant for gas and they did not tell Nitrogen having different properties (I assume it isn't so cold that it would be liquid Nitrogen

Gas laws - Wikipedia, the free encyclopedia

Anyway, if it was constant, then you would enter into trouble with the sensors, they would get closer to giving tyre pressure warnings at extreme temperatures because they assume the gas inside the tyre would change pressure according to the formulas of the link.
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