How accurate is the TPMS?
Lead Driver
Joined: May 2015
Posts: 5,881
Likes: 359
From: Mts. S. of San Francisco
We have a combo microwave/convection oven. It's not an enormous thing, so it won't work on a turkey (for example), but for most everyday cooking/baking things, it's the bees knees.
Cargo Master
Joined: Apr 2010
Posts: 3,274
Likes: 4
From: Seattle area
Wow, this thread went OT.
I topped off my tires this afternoon. My hand-held gauge read 40psi, but the TPMS is showing the LF is 39, the RR is 41 and the other two corners are at 40.
I topped off my tires this afternoon. My hand-held gauge read 40psi, but the TPMS is showing the LF is 39, the RR is 41 and the other two corners are at 40.
Last edited by onug; Sep 11, 2016 at 06:10 PM. Reason: Spel chek
Lead Driver
Joined: May 2015
Posts: 5,881
Likes: 359
From: Mts. S. of San Francisco
I would interpret that as right on, plus or minus 1 psi.
Posting Guru
Joined: Jun 2012
Posts: 1,306
Likes: 32
Same here. I had Goodyear do mine.. all 40 psi. Ford's TPMS is a little less reliable.. like GlueGuy says, plus or minus 1 psi. Strangely, all four gets closer to each other when I move and the tires warm up.
Posting Guru
Joined: Feb 2005
Posts: 2,295
Likes: 2
+/- 1psi is well within tolerance.
The super-high-end tire inflators like you find at tire shops, that run north of a kilobuck, are specced for +/- 0.3 or 0.5 psi. Your typical cheap tire gauge is (supposedly) +/- 2psi. Even if the gauge indicates down to 0.1 psi increments, it isn't accurate to that level.
The super-high-end tire inflators like you find at tire shops, that run north of a kilobuck, are specced for +/- 0.3 or 0.5 psi. Your typical cheap tire gauge is (supposedly) +/- 2psi. Even if the gauge indicates down to 0.1 psi increments, it isn't accurate to that level.
Posting Guru
Joined: Jan 2006
Posts: 1,490
Likes: 16
From: Arizona/Texas
When you start up in the morning, the pressure will be off because the sensors have gone to sleep to save battery life. After about 30 seconds of rotation, the sensors wake up. Your tires will also be different pressures if one side is in the sun. Drive about 3 miles to get a more accurate reading.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Posting Guru
Joined: Jun 2012
Posts: 1,306
Likes: 32
Great explanation. I had no idea why it'd correct itself, now that makes sense! Thanks.
When you start up in the morning, the pressure will be off because the sensors have gone to sleep to save battery life. After about 30 seconds of rotation, the sensors wake up. Your tires will also be different pressures if one side is in the sun. Drive about 3 miles to get a more accurate reading.
Posting Guru
Joined: Jan 2006
Posts: 1,490
Likes: 16
From: Arizona/Texas
This morning I decided to check the air in my tires and to also demonstrate the limits of the tpms.
The air had been checked at the dealer two days ago, but with the Temps in the upper 90's I knew the numbers should be lower this morning at a temp of 62 degrees.
As I suspected, the psi was 31.5 to 32. I aired the tires up to 35 psi per my digital guage. I also used my trusty dial guage and it showed 36 psi.
I started the truck and checked the pressure as indicated by the tpms. Both left side tires showed 36 psi, with the right side at 35 psi.
I drove approximately 2.5 miles and checked the pressure again. All four tires indicated 37 psi.
Later in the day with the temperature in the high 80's, the indicated was 40 psi for all 4 tires.
So if you do not see a flat tire when you walk out to your vehicle in the morning, do not be concerned about the tpms readings until you have driven a couple of miles.
The air had been checked at the dealer two days ago, but with the Temps in the upper 90's I knew the numbers should be lower this morning at a temp of 62 degrees.
As I suspected, the psi was 31.5 to 32. I aired the tires up to 35 psi per my digital guage. I also used my trusty dial guage and it showed 36 psi.
I started the truck and checked the pressure as indicated by the tpms. Both left side tires showed 36 psi, with the right side at 35 psi.
I drove approximately 2.5 miles and checked the pressure again. All four tires indicated 37 psi.
Later in the day with the temperature in the high 80's, the indicated was 40 psi for all 4 tires.
So if you do not see a flat tire when you walk out to your vehicle in the morning, do not be concerned about the tpms readings until you have driven a couple of miles.
Thread
Thread Starter
Forum
Replies
Last Post
BII Plow Truck
2017 - 2022 Super Duty
8
Dec 21, 2017 06:50 AM
WorldCommander
1968-Present E-Series Van/Cutaway/Chassis
7
Mar 5, 2016 07:58 PM