Reflash Computer ???
Thread Starter
|
New User
Joined: Jun 2003
Posts: 5
Likes: 0
Reflash Computer ???
With all the talk of putting on larger tires and lifts, do you really need to take the truck in and have the dealer reflash the computer to prevent odometer from reading wrong and causing computer problems? Or is this just another suggestion to get $75 from us? I have an 01 xlt screw 4x4 with 265/75/16 and plan on replacing with 285/75/16 soon.
Senior User
Joined: Jun 2003
Posts: 329
Likes: 0
Not to bud in,I have got a question for you Lxman1. I took my 03' into the dealer to have the speedo recalibrated and the term REFLASH was not mentioned. I have 285/75/16 tires and 4.10 gears, Stock was 255/70/16 tires and 3.55 gears. The dealer said they could only adjust the computer to specs and guidlines, which was 265/75/16 tires and 3.73 gearing, so my speedo is still off. I had posted this in the tranny forums and got some good info. but from what you said it can be done to any size 
Thanx Rich
Thanx Rich
Elder User
Joined: Feb 2004
Posts: 811
Likes: 0
We don't reflash, we adjust the tire size in the computer so it will calculate correctly. We sometimes have to figure out revolutions per mile to do so, so if they calculated wrong that may be why yours isn't correct. 
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
this is true, they are adjustable because different trucks come with different size tires.
If you have the money, you can buy a programmer from Motorhaven and do it yourself.
You might also try another dealer, unless you talked to the actual tech, it has been my experience that most service writers do not know a lot about how cars function. Mine tried to tell me yesterday when I showed him my blown high pressure a/c line that I probably had a coolant leak because it was green. Once that I showed him that it was oily and hissing from rubbing against the fan shroud since it was built, and explainingthat the a/c was quick cycling, then he agreed that it was freon all over the place.
Anyway, talk to the tech that actually does the work, he/she probably knows how to do it.
Jimmy
Oh yeah, reflashing usually changes the timing and fuel mixture, idle speed, etc.
If you have the money, you can buy a programmer from Motorhaven and do it yourself.
You might also try another dealer, unless you talked to the actual tech, it has been my experience that most service writers do not know a lot about how cars function. Mine tried to tell me yesterday when I showed him my blown high pressure a/c line that I probably had a coolant leak because it was green. Once that I showed him that it was oily and hissing from rubbing against the fan shroud since it was built, and explainingthat the a/c was quick cycling, then he agreed that it was freon all over the place.
Anyway, talk to the tech that actually does the work, he/she probably knows how to do it.
Jimmy
Oh yeah, reflashing usually changes the timing and fuel mixture, idle speed, etc.
Senior User
Joined: Jun 2003
Posts: 329
Likes: 0
Thanx Lxman glad you got your a/c fixed 
This is the statement from the tech: "ATTEMPTED RECALIBRATE FOR NEW TIRE SIZE AND GEAR RATIO. GEAR RATIO NOT WITHIN CERTIFITED LIMITS, CAN ONLY USE RATIOS 3.29 AND 3.76. TIRE SIZE NOT WITHIN CERTIFIED LIMITS. TARGET RANDGE IS 653-727. RECALIBRATED TO MAXIMUIN 3.76 RATIO AND 275/70/16 TIRE SIZE" I don't know talking to the tech would help if the dealer has to stick to guidelines???? Rich
This is the statement from the tech: "ATTEMPTED RECALIBRATE FOR NEW TIRE SIZE AND GEAR RATIO. GEAR RATIO NOT WITHIN CERTIFITED LIMITS, CAN ONLY USE RATIOS 3.29 AND 3.76. TIRE SIZE NOT WITHIN CERTIFIED LIMITS. TARGET RANDGE IS 653-727. RECALIBRATED TO MAXIMUIN 3.76 RATIO AND 275/70/16 TIRE SIZE" I don't know talking to the tech would help if the dealer has to stick to guidelines???? Rich
Trending Topics
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Well, if they won't do it, you can try the programmer or another dealer. 4.10 gears were an option, so it should be able to be reprogrammed for them I would think.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Thread
Thread Starter
Forum
Replies
Last Post