False TPMS readings?

winnre · 11-26-2013, 04:00 PM

Yesterday it was 37F in the morning. I drive about 200 feet when my TPMS sensor said I had a low tire. I changed cars for the day. When I got home I could see no low tire and all the pressures were fine.

Then this morning when i got in the car right away I had a low tire pressure warning again. I ignored it knowing the tires were fine and headed to work, planning to stop and check the tires now and then. After about 15 miles the sensor light went out. I checked when I got to work and at lunch and the pressure was still fine. It is 79F today.

Would the temperature make that much of a difference? I have the sport pack so maybe there is not that much air in the tires to start with since they are so tiny? Or maybe driving in the cold compresses the air THAT much? Has anyone else had this happen?

kenchan · 11-26-2013, 04:02 PM

thought the threshold was 28psi? how much psi was in the tires?
1psi change per every 10F ambient temp change.

Elan · 11-26-2013, 04:06 PM

Yes temperature makes a huge difference + you driving and warming your tires up. Mine did the same thing. When it was super cold, I got a low pressure light. As it warmed and I drove, the light went out. Very typical in winter. If you want accurate TPMS readings, check them at 59 degrees. That's standard temp and should give you most accurate reading. If you drive however, expect higher readings than if you hadn't.

kenchan · 11-26-2013, 04:08 PM

Quote:

Originally Posted by Elan

Yes temperature makes a huge difference + you driving and warming your tires up. Mine did the same thing. When it was super cold, I got a low pressure light. As it warmed and I drove, the light went out. Very typical in winter. If you want accurate TPMS readings, check them at 59 degrees. That's standard temp and should give you most accurate reading. If you drive however, expect higher readings than if you hadn't.

elan- not everyone has a nice heated garage like you.

Elan · 11-26-2013, 04:39 PM

Quote:

Originally Posted by kenchan

elan- not everyone has a nice heated garage like you.

Wait till a warm front passes through then!

kenchan · 11-26-2013, 04:41 PM

Quote:

Originally Posted by Elan

Wait till a warm front passes through then!

how dare you!!!

winnre · 11-26-2013, 05:52 PM

Quote:

Originally Posted by kenchan

thought the threshold was 28psi? how much psi was in the tires?
1psi change per every 10F ambient temp change.

They read 29-30psi this morning at the low 40s. 1psi/10F is a lot, it can easily go from 0-100 where I live.

kfull · 11-29-2013, 01:26 AM

Totally normal, mine do the same thing. Although last week or so it's been exceptionally cold and it has stayed on longer/indefinitely.

DEpointfive0 · 11-29-2013, 01:30 AM

Quote:

Originally Posted by winnre

They read 29-30psi this morning at the low 40s. 1psi/10F is a lot, it can easily go from 0-100 where I live.

Nitrogen fill!

winnre · 11-29-2013, 01:34 AM

Quote:

Originally Posted by DEpointfive0

Nitrogen fill!

Air is 80%+ nitrogen.

DEpointfive0 · 11-29-2013, 01:37 AM

Quote:

Originally Posted by winnre

Air is 80%+ nitrogen.

You know the problem with compressed air... Water...
It's the water that fùcks the air pressure. You could use dried compressed air, but it's harder to find than Nitro Fill

kenchan · 11-29-2013, 10:35 AM

honestly think nitrogen fill is more of a gimmick for wheels with only one valve stem.

falconfixer · 11-29-2013, 10:53 AM

Quote:

Originally Posted by kenchan

honestly think nitrogen fill is more of a gimmick for wheels with only one valve stem.

Snake oil comes to mind when I hear of nitrogen fill on a passenger vehicle.

Chuck33079 · 11-29-2013, 11:18 AM

Quote:

Originally Posted by falconfixer

Snake oil comes to mind when I hear of nitrogen fill on a passenger vehicle.

I'd never pay for it, but its nice to have. I check pressure every couple of days. On nitrogen filled tires, I rarely have to add air to account for temp or leakage. Regular air needs much more frequent top offs.

roy'sz · 11-29-2013, 01:14 PM

Spare tire could be low. Your other problem is when you checked it when it was 79. You need to cold set in the a.m.

11-26-2013, 04:00 PM	#1 (permalink)
winnre Track Member Join Date: Nov 2013 Location: Close to Redlands, CA Posts: 534 Drives: '14 370Z Touring Spt Rep Power: 12	False TPMS readings? Yesterday it was 37F in the morning. I drive about 200 feet when my TPMS sensor said I had a low tire. I changed cars for the day. When I got home I could see no low tire and all the pressures were fine. Then this morning when i got in the car right away I had a low tire pressure warning again. I ignored it knowing the tires were fine and headed to work, planning to stop and check the tires now and then. After about 15 miles the sensor light went out. I checked when I got to work and at lunch and the pressure was still fine. It is 79F today. Would the temperature make that much of a difference? I have the sport pack so maybe there is not that much air in the tires to start with since they are so tiny? Or maybe driving in the cold compresses the air THAT much? Has anyone else had this happen?

11-26-2013, 04:06 PM	#3 (permalink)
Elan Track Member Join Date: May 2013 Location: Alpharetta, GA Posts: 906 Drives: Airplanes Rep Power: 15	Yes temperature makes a huge difference + you driving and warming your tires up. Mine did the same thing. When it was super cold, I got a low pressure light. As it warmed and I drove, the light went out. Very typical in winter. If you want accurate TPMS readings, check them at 59 degrees. That's standard temp and should give you most accurate reading. If you drive however, expect higher readings than if you hadn't. __________________ 2009 370Z NISMO #477 \| AAM Competition Short Tails \| AAM Competition HFCs \| K&N Typhoon CAI \| Kenwood DPX300U \| Rockford Fosgate PRIME R300-4 \| Rockford Fosgate Punch P165 \| Rockford Fosgate Punch P300-12 \| Polk Audio db1001 \| 15% Tints \| GTR Start Button \|

11-29-2013, 01:26 AM	#8 (permalink)
kfull Track Member Join Date: Mar 2012 Location: Massachusetts Posts: 909 Drives: A lot Rep Power: 14	Totally normal, mine do the same thing. Although last week or so it's been exceptionally cold and it has stayed on longer/indefinitely. Initial Z likes this. __________________ 2012 GM 6MT sports package \| FI non res cf exhaust \| K&N Drop Ins \| Viper 3303 security system w/ tilt sensor \| GTR start button \| 35% rear 45% side window tint \| Michelin PSS

11-29-2013, 10:35 AM	#12 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	honestly think nitrogen fill is more of a gimmick for wheels with only one valve stem. falconfixer likes this.

11-29-2013, 01:14 PM	#15 (permalink)
roy'sz A True Z Fanatic Join Date: Aug 2011 Location: palmdale, ca Posts: 1,299 Drives: 2010 nissan 370z Rep Power: 15	Spare tire could be low. Your other problem is when you checked it when it was 79. You need to cold set in the a.m. __________________ https://www.youtube.com/watch?v=RtvG...data_playerARK HFC'S-ARK Grip-Stillen G3-M370-UPREV-Kinetix upper control arm-WC Latheworks-Stage2 Bad@$$ Driver(318whp/268tq)-

11-26-2013, 04:02 PM	#2 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	thought the threshold was 28psi? how much psi was in the tires? 1psi change per every 10F ambient temp change.

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