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Speedometer way off double speed

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Old 08-13-2018, 09:32 PM
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Default Speedometer way off double speed
Car was fine did an oil change vacumed some leaves and stuff under the hood. Suddenly today my speedometer is reading double the speed. Going 40 it says 80 or so. Is this a ground issue or what is going on? Any help on this would be great.
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Old 08-13-2018, 10:02 PM
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You haven't accidentally changed it to km/h?
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Old 08-14-2018, 09:46 AM
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^^
Op...you changed it to KMH when you were trying to reset the maintenance light.
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Old 08-14-2018, 03:49 PM
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^^^ Likely what happened but it doesn't actually double, 30MPH is 50KPH. Hopefully you got it figured out.
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Old 08-15-2018, 02:20 AM
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Don't feel bad. I've done the same thing and it took me a bit to figure out what I did.
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Old 08-15-2018, 04:57 AM
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Loose ground (G101) on the back of the cylinder head will directly result in a LOW reading speedometer, but not a high one like the OP. It can lag behind at half speed or so.
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Old 08-16-2018, 01:56 AM
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Another little tid bit of information from the master to stick in the back of our brains.
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