2nd Generation Specific 1986-1992 Discussion

Speedometer Incorrect

Old 02-02-2004, 09:35 AM
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ok so saturday i discovered my speedometer is off. its good up til 25 then until about 70 its about 5 off then after that its like 10 off. what to do? its an auto
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Old 02-02-2004, 09:50 AM
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do you have different size rims or tires than stock?
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Old 02-02-2004, 10:20 AM
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Did you ever change the diff with one that has another ratio at anypoint or something?
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Old 02-02-2004, 01:53 PM
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i have the same problem on my fone dial rims...i drove from NC to Portland and it was a 3000 mile drive and my odometer registered 3300 miles. The other day i was driving by the lil speed display of how fast i was going and my speedo says 40 but the display tells me im doing 36. I say im about 10 percent off so i just calculate that in, but is there any reason for this?
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Old 02-02-2004, 02:17 PM
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different size tires than stock? bigger smaller?
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Old 02-02-2004, 02:44 PM
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If you rims&tires are of a smaller total dia. you will read a faster speed than actual speed (ie your speedo will read 65 but you will be doing 60) you will also get a greater amount of miles on the clock because the wheels are turning faster and the count is going faster. if you have the stock size rims and 2 tire sizes smaller you will be .2 off per mile. It will add .2 miles per mile and you will be about 5 mph off. hope that helps out on that question...Or your speed sending unit might be taking a crap.
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Old 02-02-2004, 04:40 PM
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everything on the car is stock
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Old 02-02-2004, 04:44 PM
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If it's an auto tranny, I'd suspect the little gear inside the tranny that goes to your cable is worn causing it to be thrown off. Of course, it depends what type of transmission you have if it even has one of these. I'm guessing yours is also electronic so I'm not sure if that uses the same thing I'm talking about.
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Old 02-03-2004, 02:42 AM
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what tires are stock for the fone dial rims?
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Old 02-03-2004, 07:04 AM
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Originally Posted by dltreezan' date='Feb 2 2004, 11:53 AM
i have the same problem on my fone dial rims...i drove from NC to Portland and it was a 3000 mile drive and my odometer registered 3300 miles. The other day i was driving by the lil speed display of how fast i was going and my speedo says 40 but the display tells me im doing 36. I say im about 10 percent off so i just calculate that in, but is there any reason for this?
dont trust those things, they are very inacurrate.
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