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SportTrac Discussion
Engine & Drivetrain
Mystery remains: Why does my odometer advance when in Park?
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<blockquote data-quote="parker_lansing" data-source="post: 1051761" data-attributes="member: 78464"><p>Since I bought my <a href="https://sporttrac.org/threads/2003-explorer-sporttrac-xlt-4-0l-4wd.124246/" target="_blank">2003 Sport Trac XLT</a> back in March 2023, the speedometer has bounced around when idling (parked or in gear), but when I'm driving more than about 15 mph, the needle snaps into place where it should be. When I slow down under 15mph, the speedometer starts bouncing around again, from 0mph to 15mph.</p><p></p><p>After a few months, while waiting at a drive-thru, I noticed that the tenths digit on my trip odometer was advancing at idle.</p><p></p><p>I spent an hour or so experimenting with this and taking notes, and I found that when in Park or at idle in Drive, the odometer was advancing as if I were going 6mph, even though the vehicle was at a stop.</p><p></p><p>This corresponds with the speedometer bouncing around, if the average is <strong>(15mph - 0mph ) / 2) = 7.5mph</strong> (close enough to what the odometer was telling me).</p><p></p><p>And this was happening consistently for both the trip odometer and the regular odometer.</p><p></p><p>I had all sorts of theories, from a malfunctioning dash console, to a transmission slippage problem, to an odometer gear problem.</p><p>I figured it was going to be expensive, so I tried to ignore it for a while.</p><p></p><p>But yesterday, I got my truck back from the following service:</p><p>- plugs, wires, air filter</p><p>- check transmission fluid (right where it is supposed to be)</p><p>- replace serpentine belt and tensioner</p><p></p><p>And, to my surprise, both the speedometer and odometer issues were gone!</p><p></p><p>Update: The problem went away for two weeks, and has suddenly returned.</p><p></p><p>Can anyone explain this for me?</p></blockquote><p></p>
[QUOTE="parker_lansing, post: 1051761, member: 78464"] Since I bought my [URL='https://sporttrac.org/threads/2003-explorer-sporttrac-xlt-4-0l-4wd.124246/']2003 Sport Trac XLT[/URL] back in March 2023, the speedometer has bounced around when idling (parked or in gear), but when I'm driving more than about 15 mph, the needle snaps into place where it should be. When I slow down under 15mph, the speedometer starts bouncing around again, from 0mph to 15mph. After a few months, while waiting at a drive-thru, I noticed that the tenths digit on my trip odometer was advancing at idle. I spent an hour or so experimenting with this and taking notes, and I found that when in Park or at idle in Drive, the odometer was advancing as if I were going 6mph, even though the vehicle was at a stop. This corresponds with the speedometer bouncing around, if the average is [B](15mph - 0mph ) / 2) = 7.5mph[/B] (close enough to what the odometer was telling me). And this was happening consistently for both the trip odometer and the regular odometer. I had all sorts of theories, from a malfunctioning dash console, to a transmission slippage problem, to an odometer gear problem. I figured it was going to be expensive, so I tried to ignore it for a while. But yesterday, I got my truck back from the following service: - plugs, wires, air filter - check transmission fluid (right where it is supposed to be) - replace serpentine belt and tensioner And, to my surprise, both the speedometer and odometer issues were gone! Update: The problem went away for two weeks, and has suddenly returned. Can anyone explain this for me? [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Mystery remains: Why does my odometer advance when in Park?
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