Grand Am Speedometer [Solved]

[doble]

I have a 1991 Pontiac Grand Am. Sometimes the speedometer does not work at all and all at once it will start working but it might stop and start. Several days ago as I was almost stopped it went wild swinging back and forth showing a speed of 100mph. I replaced the vehicle speed sensor on the transmission but it did not help. What should I check next? Where can I download A copy of the wiring diagram?

 

[doble]

I decided to dig a little deeper and go into the computer.When the circuit board was flexed in certain areas the problem would start and stop.While viewing under magnification I found several cracked soldier joints. I repaired these and for now the problem has gone.

 

[Midnight Tech]

Good job doble! Gonna mark this as solved....

 

[fictious]

Great man i taught of giving the same suggestion before reading the 2nd post.