Tires Don't Hold Pressure

[Gasaraki]

This means you have either things stuck in your tires generating a slow leak, a faulty valve, or dented rims. This is not a "car" problem, this is an issue with your specific tires, as you should not need to refill air more than once or twice a year.

Must be the first time owning a car for the OP.

 

[father_of_6]

And never trust TPM's.

Really?!? That's the first time I've heard this.

 

[Kairide]

Checked his other posts. Definitely little man syndrome.

So you checked all 1,580 of my previous posts to come up with this hypothesis?
Some of my posts may be more honest and straight to the point than people like. But since you have all of 225 posts over 2 years, at least I’m contributing to this forum.

 

[ThomasD]

1 to 4 psi isn't a lot. Is the difference in tire pressure setting off the tire pressure sensors? Take a spray bottle of soapy water and spray the tires. Also spray around the tire bead and valve stem area. if you have bubbles you have a leak. Tires will loose some pressure as they cool down after driving, They will also gain pressure as you drive. That is why on the tire it says the tire pressure then next to it says cold.

 

[Big Dog]

1 to 4 psi isn't a lot. Is the difference in tire pressure setting off the tire pressure sensors? Take a spray bottle of soapy water and spray the tires. Also spray around the tire bead and valve stem area. if you have bubbles you have a leak. Tires will loose some pressure as they cool down after driving, They will also gain pressure as you drive. That is why on the tire it says the tire pressure then next to it says cold.

It definitely is, every 2 weeks. I check my tires frequently, but only fill them 3-4 times per year. In the fall, when the temps drop; in the early winter when it's even colder, and then in spring. Summer cranks up the heat, so even with a few psi leakage, the warmer weather will account for it.

The rule of thumb is that tire pressure changes 1 psi for every 10 degrees temp differential. (at sea level)

 

[rpiotro]

Really?!? That's the first time I've heard this.

They are not precision devices but usually pretty close. The ones on my Tesla are pretty accurate. On my wife's Mercedes two of them are off by at least 1 PSI.
They are good for a reference only.

 

[MJB-CO]

They are not precision devices but usually pretty close. The ones on my Tesla are pretty accurate. On my wife's Mercedes two of them are off by at least 1 PSI.
They are good for a reference only.

My TPMS sensors are off by about 2 PSI - lower than actual pressure. I've wondered if altitude affects them as I live at 6,000 feet.

 

[leoita]

My MYP tires are within 1-2 range depending on the temperature. I never touch them.

 

[rpiotro]

My TPMS sensors are off by about 2 PSI - lower than actual pressure. I've wondered if altitude affects them as I live at 6,000 feet.

A possibility. If they are measuring the delta of the tire pressures vs ambient. Sea level pressure of 14.7 PSI would drop to 11.8 PSI at 6K feet elevation.