1999 Astro - speedometer and driveline issue..

Slow Buick

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1999 Astro issue..

http://www.youtube.com/watch?v=xSl-CcbCei4

The problem is that at times, the speedometer jumps around while at cruising speeds. When it's doing this, the car stumbles/surges as if it's trying to find a lower gear if you try to accelerate even gently. When you put the pedal down to the floor, it makes it much more apparent. At around 40-45, it seems like it tries to go down into first gear. This issue doesn't happen at all in first gear which makes me for some reason think it's a vehicle speed sensor. On older cars, I would think it was the speedometer cable, but they stopped using those in like 92 or so on these. If I remember right, I think the only VSS on this vehicle is at the front of the driveline? Hopefully you guys can help me out.
 

Outlaw

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Start with the speed sensor, a lot of GM's rely heavily on the VSS for drivability.
 

Slow Buick

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I googled it, showing a reluctor wheel and the sensor itself. Could any kind of debris have somehow gotten in where it's at, or do you think the sensor just failed?
 

Mike K

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Speed sensor for sure. If it's anything like the old Fords it's used for torque converter lockup, gear selection, etc.
 

Slow Buick

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What should I do with this?

Wire all fucked up. Only works in first and then I have to manually go to second
 

LSx S10

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Cut out the section of wire that is rubbed through, solder it back together, heat shrink it.
 

Slow Buick

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Factor in a nice reach around and I'll consider it, pretty boy :wavey:
 

Slow Buick

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fixed. also hung the fucking bajeesus out of the wire so this doesn't happen again.

also threw some royal purple in that bitch. :jg:

not baller enough for :amsoil:
 

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