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  #1  
Old 07-23-2010, 11:54 PM
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Default TPMS Discrepancy

I'm seeing quite a discrepancy between what my air compressor is seeing and what the TPMS on the truck is telling me. I used my air compressor to set all four tires to 36PSI however when I check in the truck the TPMS on the EVIC shows as follows:

42 40

41 39

Is this normal for the TPMS system ?????
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  #2  
Old 07-24-2010, 12:11 AM
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Nope..this is not normal if those EVIC readings came with the tires cold right after you checked the pressure and you have an accurate external gauge.

Is your air compressor gauge accurate? Have you independently verified the tire pressure with a good quality gauge?

My SRT8 has TPMS and it is extremely accurate!
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Old 07-24-2010, 12:15 AM
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I'd like to think my compressor gauge is pretty accurate however have not confirmed with anything properly calibrated. However I set all four tires to exactly 36PSI so why would the EVIC TPMS show a different reading on each tire . Do you think that this is something the dealer should fix ? Or is there anyway to calibrate the sensors myself ?
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Old 07-24-2010, 12:19 AM
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I know the 2 compressors I have in my cars aren't accurate . Definitely use a good guage .
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Old 07-24-2010, 12:25 AM
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Check using a good tire gauge. I have excellent gauges and regulators on my big compressor, and the reading errors on it are.....impressive. Not repeatable at all! Yet my $12.00 digital gauge from Can Tire is repeatable within .5psi....and as a bonus, agrees with my TPMS.
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Old 07-24-2010, 12:27 AM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
I know the 2 compressors I have in my cars aren't accurate . Definitely use a good guage .
I should have mentioned that I am using a Campbell Hausfeld Pistol Grip Heavy Duty Tire Inflator w/ Gauge that came with my Campbell Hausfeld compressor. I feel that it should be fairly accurate.
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Old 07-24-2010, 12:30 AM
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Quote:
Originally Posted by RansRAM View Post
I should have mentioned that I am using a Campbell Hausfeld Pistol Grip Heavy Duty Tire Inflator w/ Gauge that came with my Campbell Hausfeld compressor. I feel that it should be fairly accurate.
I am trying to figure out how to say this diplomatically and ........

Call a spade a spade!

They're crap! Seriously, they only give you a 'general' idea of where your at. 35psi +/- 5psi.
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Old 07-24-2010, 12:38 AM
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I work at a tire shop and those tpms sensors are extremly accurate, and if you want to be as exact as humanly possiable, find the nearest discount or american tire. we have automated air machines that are accurate to the .25 of a pound.
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Old 07-24-2010, 12:50 AM
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any tire machine, or air compressor gauge can be off in psi due to the air being held within the hose...in my shop, i make sure to check the psi in tires with my digital gauge to make sure they are correct, because sometimes the machine gague is off by 2-5psi...the tpms are very accurate imo in a tires psi...
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Old 07-24-2010, 12:54 AM
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Quote:
Originally Posted by brad12kx View Post
I am trying to figure out how to say this diplomatically and ........

Call a spade a spade!

They're crap! Seriously, they only give you a 'general' idea of where your at. 35psi +/- 5psi.
Wow, that bad eh !! Sounds like this is coming from experiance. So it's probably better for me to bleed of air until I see 35PSI on the EVIC because right now I'm way over inflated.
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