Speedometer is 10 mph too slow
I bought a used Mustang. Driving home my
spouse was following. He wanted to know if I
afraid of the car because I drive so slow. We used
Waze and when it reads 80 mph, car shows 70
mph. Would this cause the mileage to be
olincorrect as well? Fyi, checked speedometer
against other vehicles using Waze and it was spot
on.
4 Answers
Maybe a previous owner swapped out rear end to one with a different gearing. Excessively oversized or undersized tires/rims can affect speedo reading. Ford does make a speedo recalibration tool if the rear end has in fact been swapped out.
Talked with my brother and he thinks someone must have changed gears in rear end. Going to take to our trusty mechanic to diagnose/fixed. This should correct problem as well as whine coming from back.
Hi Wilsonch i have the similiar issue with my honda accord 2007 i recently bought. did you find the reason of this issue.