I have a 2006 Eclipse and the right front tire loses about 4lbs. of air every two days. I have had it to the dealership twice and they cannot find the problem. I am in Missouri and the weather has been cold, but I am not having problems with the other tires. Could it be that by the time I get the car to the dealership the tire is warmed up and no longer losing air? Or could it be a problem with a faulty rim? I had this problem last year in Nebraska and the garage cleaned the rim and everything was fine from April until December.
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Hopefully you still have you manual. I will tell you how to reset the HHR, I found it in my manual. Turn the key to on, press lock and unlock at the same time on your key fob. The horn will beep twice telling you that you are in program mode. The left front turn signal light will come on, press the valve core letting air out of the left front tire. The horn will beep when left front is programmed. Then the right front turn signal will come on, let air out till horn beeps. Then right rear, same procedure then left rear same procedure. When that is done horn will beep twice again saying tire program is complete. Turn key off, make sure you air all tires back up.
alot of things could be causing excessive tire wear i would imagine the dealership would of told you if there was front end problems so we can rule that out but two more important things are rotating tires every 3000 miles and checking and or making adjustment on alighnments atleast twice a year. the angle that would cause the worst tire wear and is almost always the angle that is out is toe. I would start with a alighnment and making sure your tires are rotated
Tires do lose air pressure when the temperature drops. They should stabilize after a while and ndot need constant service. Don't rely on the tire pressure sensor. Use a good tire gage to determine the need to add air. If you are adding air every few days, I would think you had a slow leak somewhere. Is it all 4 tires or just one. What about the wheels. Are they the original wheels, or customs. Some custom wheels don't seal as well as the originals. If you really are losing air every few days, you might want to consider sealing the tires with a commercial product such as the one called Slime. It's kind of pricey, but works great.
You can lower the tire pressure in your tires by about 4 lbs. This will help your ride but you may experience outer edge tire wear. The Porsche Cayman has a very stiff suspension and is never going to ride smooth no matter what you do. After all this is a full blown sports car. Sports cars do not ride smooth. You pay a penalty for great handling like your Porsche has. If you have the Porsche Active Suspension Management (PASM) on your car set it for comfort. Other than the tire pressure and possible a different set of tires there is nothing you can do to improve ride comfort.