Speedometer is about 12 Mph ahead... Could use some Ideas..?
#1
Speedometer is about 12 Mph ahead... Could use some Ideas..?
I just got a 2005 v6 mustang, and there really is no problems with it, except the speedometer. When we speedometer says i'm going 60, I can tell i'm going faster for one, but my gps says i'm going 73 (which is right). And I'm wondering if anyone has any ideas about why this would be happening?
The odometer is also lying to me, Its about 1/10 of a mile slow, so when i've gone 10 miles I've really only gone 9, or 100 i've really only gone 90, which means I can't really calculate my gas milage accurately. Any ideas?
The odometer is also lying to me, Its about 1/10 of a mile slow, so when i've gone 10 miles I've really only gone 9, or 100 i've really only gone 90, which means I can't really calculate my gas milage accurately. Any ideas?
#2
Ugghhh, for one I hate gps, just detest them, even though they are pretty good about getting your speed correct, possibly there was a gear change done and they never corrected the speedometer and thats why you are off.
#4
If it is that issue you would need a tuner to change the computer to adjust for that, if you just bought the car you can ask the previous owner if they changed the gears, they possibly could of returned the car to stock to keep their tuner and just forgotten to mention that to you.
#8
6th Gear Member
Tire and gear changes without restting the PCM values for those will cause the speedometer to be off. You can adjust them with a handheld tuner but if you're going to spend the $$ for the tuner then it only pays to get some custom tunes and take advantage of the potential 15-20 RWHP gain with a CAI & custom tunes.
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nmra1965
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09-26-2015 10:46 AM