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check rim sizes and tires fitted as they may be smaller than the speedo sender is gear ed for
smaller dia. tires = faster speedo reading as the speedo reads off drive shaft speed
I would suspect you have a faulty electronic speedo head, have the cluster removed and have it sent out for repair of the problem. There is no at home repair procedure for this problem, it takes special equip to repair the speedo.
It appears that you need to have the speedometer calibrated. Unfortunately, this is very challenging. You'll need to take it to a mechanic. Dependent on where you take your Envoy it can cost around $75+
Yes, you'll be o.k. They don't recommend anything over 3% difference, and your at about 1.8%. Speedo will read 61 mph when actually doing 60 mph. Have a look.
Stock Tire - 215/60R16>Search TiresTire 1 - 205/60R16>Search Tires
Section Width:
8.46 in
215 mm
Section Width:
8.07 in
205 mm
Rim Diameter:
16 in
406.4 mm
Rim Diameter:
16 in
406.4 mm
Rim Width Range:
5.5 - 8.5 in
Rim Width Range:
5.5 - 7.5 in
Overall Diameter:
26.15 in
664.21 mm
Overall Diameter:
25.68 in
652.27 mm
Sidewall Height:
5.07 in
128.77 mm
Sidewall Height:
4.84 in
122.93 mm
Radius:
13.07 in
331.97 mm
Radius:
12.84 in
326.13 mm
Circumference:
82.15 in
2086.6 mm
Circumference:
80.67 in
2049.0 mm
Revs per Mile:
795.4
Revs per Mile:
809.9
Actual Speed:
60 mph
100 km/h
Speedometer1:
61.0 mph
101. km/h
Speedometer Difference: -
Speedometer Difference: 1.822% too fast
Diameter Difference: -
Diameter Difference: 1.8%
Many cars have an error on the speed indicated. 10% sounds quite high, next time you buy tyres go for one size bigger or the next profile up, eg, if you are using 70 series go to 75 or 80. That will sort your problem out and you will get better fuel consumption. You can have the speedo calibrated but I would thing that the cost or effort wonuldn't justify the result.
A vehicle speed sensor that is starting to fail could cause this, or less than likely bad wiring or connections, or yes, a bad cluster could do this... But how exactly did she notice the speedometer was 10MPH fast?? There are no real accurate speedometers in vehicles (Don't get me wrong they shouldn't be off by 10MPH) but there is a 5 or so percent difference high or low in many vehicles even with stock powertrains. I've plugged in with a diagnostic scanner on many vehicles and the dash speedo shows 60MPH, but the electronic speed readout on the scanner reads as low as 55MPH or as high as 65MPH
Does your car have a english/metric switch or option in the settings of the DIC? You may have it set on metric, which will cause the speedo to read killometers instead of mph.
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