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Old 05-10-2016, 02:48 PM
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Tire Pressure on 1 Tire Consistently Different

Question for the experts out there - the tire pressure on 3 of my tires always matches up (ex. all read 41 psi), but the front passenger side is ALWAYS 1-2 psi below the other tires (ex. would read 39 or 40 psi).

Is this a problem? Would it cause any sort of long term wear pattern issues?

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Old 05-10-2016, 06:20 PM
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Re: Tire Pressure on 1 Tire Consistently Different

If you inflate the RF tire to match the others, does it lose pressure over time? If so, you have a leak somewhere.
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Old 05-10-2016, 06:29 PM
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Re: Tire Pressure on 1 Tire Consistently Different

Are these numbers from the TPMS in the EVIC or are you measuring them with a quality pressure gage? If from the TPMS and you've checked with a gage, then perhaps you have a bad TPMS. There will always be a slight variability from TPMS, but when one constantly reads different than others, then the device is suspect...as long as your manual readings are consistent. If it's the manual reading that's off, then your tire may be at fault.
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Old 05-10-2016, 06:32 PM
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Re: Tire Pressure on 1 Tire Consistently Different

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Originally Posted by Jim_in_PA View Post
Are these numbers from the TPMS in the EVIC or are you measuring them with a quality pressure gage? If from the TPMS and you've checked with a gage, then perhaps you have a bad TPMS. There will always be a slight variability from TPMS, but when one constantly reads different than others, then the device is suspect...as long as your manual readings are consistent. If it's the manual reading that's off, then your tire may be at fault.

Thanks for the insight. Yes, these are all from the TPMS. I haven't checked it manually with a gauge, so perhaps I'll have the tire shop that sold me them do that. Do you think 1-2 PSI warrants concern or is that difference negligible?


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Old 05-10-2016, 06:36 PM
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Re: Tire Pressure on 1 Tire Consistently Different

If it doesn't go lower, then I wouldn't worry about it much. Do yourself a favor and buy a quality digital gage from Amazon or wherever and keep it in your glove-box or center console. The cost is small and you'll be able to check things with more precision. TPMS is somewhat an "approximate" reading...usually close, but not always consistent.
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Old 05-10-2016, 09:54 PM
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Re: Tire Pressure on 1 Tire Consistently Different

Are you seeing the difference when you first get into the vehicle, after you have been driving for sometime, or all the time?

You could get 1-2 PSI difference between tires with one sitting in the sun and the others in the sad (at least I have seen that much of a difference). But typically equal out after driving a bit and the tires heat up a bit.

As mentioned, I would check all the tires with a hand gauge first and verify the pressures. If the one is off, then add some air to get it equal to the others and see what it does with time (it might have just been under-inflated a bit compared to the others).
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Old 05-10-2016, 11:40 PM
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Re: Tire Pressure on 1 Tire Consistently Different

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Originally Posted by tweak View Post
Are you seeing the difference when you first get into the vehicle, after you have been driving for sometime, or all the time?



You could get 1-2 PSI difference between tires with one sitting in the sun and the others in the sad (at least I have seen that much of a difference). But typically equal out after driving a bit and the tires heat up a bit.



As mentioned, I would check all the tires with a hand gauge first and verify the pressures. If the one is off, then add some air to get it equal to the others and see what it does with time (it might have just been under-inflated a bit compared to the others).


Thanks Tweak. PSI is off at startup and after driving a while. I'll uses gauge to check it out.


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Old 05-11-2016, 04:41 PM
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Re: Tire Pressure on 1 Tire Consistently Different

Quote:
Originally Posted by Jim_in_PA View Post
If it doesn't go lower, then I wouldn't worry about it much. Do yourself a favor and buy a quality digital gage from Amazon or wherever and keep it in your glove-box or center console. The cost is small and you'll be able to check things with more precision. TPMS is somewhat an "approximate" reading...usually close, but not always consistent.
This one seems reasonably accurate with repeatable readings as an inexpensive unit.

Michelin MN-4535B Digital Programmable Tire Gauge with Bleed Valve

You'd need a lot of patience to use the bleed valve, and like most digitals it will turn itself off just as you try to use it again.

Wish someone would make a gauge with an input that you could hook your air compressor/pump to, so you could fill/read, etc.


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Old 05-11-2016, 05:30 PM
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Re: Tire Pressure on 1 Tire Consistently Different

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Originally Posted by rcrotty View Post
Thanks for the insight. Yes, these are all from the TPMS. I haven't checked it manually with a gauge, so perhaps I'll have the tire shop that sold me them do that. Do you think 1-2 PSI warrants concern or is that difference negligible?


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OK, that's part of the problem....I have a digital tire gauge that's been verified accurate, by the Calibration Lab at my former employer's shop. It works in 1/2 pound increments. I use it to check my tire pressures bi-weekly, and I'm VERY careful to get all tires inflated to the same pressures.....by the gauge.

However, after carefully getting all the tires the same, once I've been driving for several miles, the RR tire reading on the dashboard screen, usually reads 1 PSI higher than the other 3.
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Old 05-16-2016, 02:28 PM
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Re: Tire Pressure on 1 Tire Consistently Different

Which tires are you running at 41 PSI?
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Old 05-16-2016, 03:21 PM
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Re: Tire Pressure on 1 Tire Consistently Different

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Originally Posted by satori View Post
Which tires are you running at 41 PSI?

Well, they always seem to vary, but it's all tires with the exception of the front passenger side.

PSI ranges from 37-41. Front passenger side seems to be consistently 1 or 2 psi less than the remainders.


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Old 05-16-2016, 03:40 PM
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Re: Tire Pressure on 1 Tire Consistently Different

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Originally Posted by rcrotty View Post
Well, they always seem to vary, but it's all tires with the exception of the front passenger side.

PSI ranges from 37-41. Front passenger side seems to be consistently 1 or 2 psi less than the remainders.


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Sorry, should have been more clear. I was wondering which brand / model / size you are running at 41 psi
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