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1997-2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

1999 EXPEDITION AWD

 
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Old 05-14-2019, 06:27 PM
chumley1999
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1999 EXPEDITION AWD

Hello, New to forum have question concerning awd bypass, I was wandering if pulling the fuse do I still have to worry about tire dimensions like I do if I don't bypass as in keeping the tires all within 3/32 of each other as well as tread pattern. Thanks as i have 8/32 in back and need 2 front tires asap, 255/70/16
 
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Old 05-14-2019, 07:25 PM
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What about your ABS?
 
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Old 05-14-2019, 09:28 PM
chumley1999
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Not sure of he abs system and if that would effect the tires size
 
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Old 05-15-2019, 09:30 AM
alloro
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Originally Posted by chumley1999 View Post
if pulling the fuse do I still have to worry about tire dimensions
No you do not, and to answer the other good question that came up, no the ABS will not be affected since that works by counting the passage of the tone ring teeth per wheel.
 
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Old 05-15-2019, 12:12 PM
pdqford
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Except that the ABS might kick in while braking if there is too much variation in tire demensions.
I’m not sure on how much variation you can get away with.

I can’t remember, but does the ‘99 have a 2H position on the selector switch?
 
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Old 05-16-2019, 06:06 AM
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99 does not have 2h, if it did he wouldn’t be pulling the fuse.
 
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Old 05-16-2019, 09:20 AM
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Originally Posted by pdqford View Post
Except that the ABS might kick in while braking if there is too much variation in tire dimensions.
No it does not work that way. The ABS continually counts the tone ring pulses and will only interfere if it sees a gap in the pulse count because it thinks the wheel has locked up and stopped turning. The size of the tires or any variety in the size of tires on the vehicle has no affect on how the ABS works.
 
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Old 05-16-2019, 11:08 AM
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Okay. What your saying is that the wheel tone ring signal must go to zero in order for the ABS to kick in while braking. I didn’t know that. Thanks for the correction.
 
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Old 05-17-2019, 09:32 AM
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Originally Posted by pdqford View Post
Okay. What your saying is that the wheel tone ring signal must go to zero in order for the ABS to kick in while braking. I didn’t know that. Thanks for the correction.
No not necessarily zero, it just has to break the evenly spaced pattern the sensor counts as the tone ring teeth pass it. It's really fast, the pattern is counted in hundreds of a second, if not thousands. See the crack in the tone ring in this image, that additional gap is enough of a break in the pattern for the ABS to kick in when applying the brakes even though the wheel really isn't locking up.

 

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