speedometer outta controll

help.. my speedometer is goin crazy.. i have a 1995 mustang v-6 3.8. 5 speed manual tranny. when i go through the gears to get up to speed my speedometer seems to be about 15 mph fast... and stops accelerating at about 78.. even though i know im goin alot faster..also when i go through the gears the speedometer goes alot faster than the tach like i had NOS on steroids. and sometimes the speedometer doesnt work at all..... and we all know that a 6 cyl. mustang isnt that fast...its freaky.. the odometer seems to be working perfectly..somethings definitely wrong here. any ideas or suggestions please help. -Brett

Sounds like a speed sensor problem. Hook up a scan tool and see what the speed sensor is doing via scan tool while this is happening.................


help.. my speedometer is goin crazy.. i have a 1995 mustang v-6 3.8. 5 speed manual tranny. when i go through the gears to get up to speed my speedometer seems to be about 15 mph fast... and stops accelerating at about 78.. even though i know im goin alot faster..also when i go through the gears the speedometer goes alot faster than the tach like i had NOS on steroids. and sometimes the speedometer doesnt work at all..... and we all know that a 6 cyl. mustang isnt that fast...its freaky.. the odometer seems to be working perfectly..somethings definitely wrong here. any ideas or suggestions please help. -Brett

i changed the speed sensor.. put a new one in it and still no change.. lately its been staying on zero when im up in 3rd gear from a start.. i smack the dash and it goes up to where its supposed to be.. then its fine for a few minutes untill i get up near 70-80 then its bouncing back and fourth...any ideas.. thanks..-Brett

Check the connection at the speedo, my bet is that it's the speedo itself.



i changed the speed sensor.. put a new one in it and still no change.. lately its been staying on zero when im up in 3rd gear from a start.. i smack the dash and it goes up to where its supposed to be.. then its fine for a few minutes untill i get up near 70-80 then its bouncing back and fourth...any ideas.. thanks..-Brett