Tire pressure warning light is going off but the tires look fine

vipor

tires heated up while driving, expanded the air. highway driving does it pretty quickly.

happened to me the first cold snap we had here. been a little better about checking them since.

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Dwight Frye

No problems yet with my 370Z but I have noticed they lose about 1 lb a week on all 4 tires and I've long been aware of larger fluctuations due to the ambient air temperature. I just put a few pumps into each tire with a bicycle pump about once a week rather than trying to find a gas station air pump that works. My G35 Coupe was the first car I owned with TPS monitors and one cold (for SouCal) winter morning the warning went off. I pulled into the closest gas station and checked the tires with my own dial gauge and all 4 were down to about 27 lbs. The standard PSI was supposed to be 35 and I think the TPS sensors are supposed to go off when the pressure drops lower than about 8 PSI below their threshold so the system worked perfectly. I pumped them all back up, drove a few miles and the light went off and never had it happen again.

ZKindaGuy

Geezuz...you don't exactly know how much the pressure read. You thought it read 30 but maybe it was 35.....you ask if its temperature related and might it go back up when the temperatures rise again.....you admit to not checking the tire pressure regularly.....you are not sure what to do.......

Let me ask you a question....why in hell did you buy a $40,000 car if don't even have a clue about something that is just down right common sense and don't seem the least bit motivated to do something above and beyond the making of excuses or waiting for the ambient temperatures to go up???!!!!

SIR,,,,,do that beautiful car a favor and take it back to the dealer and have them buy it back so they can find someone who really can appreciate what it is they will be buying....

dad

The locking hook holds on by it self, I have no trouble with it sealing. How ever valve stems may vary!
What I really like is the bleeder(picture circled). If I over inflate, all you do is press the bleeder button a few times, until you get down to the correct pressure. It sure beats using your finger nail, only to find out you've let out too much air, and having to pump air back in, and re-take a reading!
Plus it read out in increments of .1, .4, etc.!

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dandg

dandg

Ok, all of the tires are showing a little above 30 and the light still remains on. It just lights up as soon as I start the engine and remains lit.

I drove it around for 20 minutes today and it hasn't shut off. I'm guessing it's a broken sensor now...

vipor

shouldn't be "a little above 30"

they should 35. period. get the tires warm before checking them.

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2009 NISMO # 0193 | QAB | Albums! | 05.04.10 (Dynojet) 291.94hp/248.28tq
Oil Cooler (DIY) | Custom Headlights | GTSPEC Braces | F.I. Long Tube Headers

Lug

Mine trip in my 350Z at 29 lbs. so 30 doesn't seem an unreasonable point to trip at.

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ChrisSlicks

Yes, they trip right at 29 in my experience (despite the manual saying 27). Try to keep them between 32 and 35 cold.

And yes, Nitrogen changes volumetric pressure with temperature at the same rate as regular air, you have to adjust your tire pressures just as often as the rest of us. The main reason to use nitrogen IMO is to avoid the water vapor, which causes problem when the tire temperatures start reaching 140 degrees or more, i.e. when racing. On the street - it doesn't do diddly squat.

huoZian

I had the exact problem yesterday, and of course it was also the day I got my first oil change and service. This is Northern california and the weather was only about 45 at worse. I have been driving for about 80 miles intermittently. Stopped and checked the pressure right away when the light came one. I read the manual and it said that electronic interference can affect the sensor, and I was charging my GPS. After I unplugged it it as ok! I think it was because it was full charged but left plugged. I'll drive more in a couple of days but after I unplugged it I drove about 50 miles stop and go and also steady without the light coming on.

IDZRVIT

No arguement here. The free nitrogen - 78% out of the hose - has worked for me for 40 years.

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Lug

In my 350Z it won't go back off until about 32 lbs. The nice thing about the 350Z's is that you get an actual readout you can use while filling the tire if you don't have a guage. There is about a minute delay between adding air and it showing up on the readout.

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tettes

Same thing happened to me today.

I read this thread and my owner's manual before heading to the gas station to fix the problem.

Tires were all at about 27, so I bumped all four up to 35 and drove for about 1 minute at 35 or 40 mph before the warning light disengaged.

I've already ordered one of the tire pressure gauges that "dad" recommended.

Thanks, all!

ChrisSlicks

I've had that pressure gauge that dad mentions for a little over a year. Excellent gauge, extremely accurate. The bleed valve is nice as it lets you over-inflate your tires slightly with the compressor and then use the pressure gauge to obtain a precise pressure.

Dark_Sub_Rosa

Is it that hard to put the correct amount of air in the effin tire. The light is going to trip at 30, our G37 had 31 lbs and the light tripped so I put air in it. How lazy can you seriously be.

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