speedo problem
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Joined: Mar 2004
Posts: 70
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From: QC
speedo problem
i learned the hard way that my speedometer is slightly off (court date is july 14 
) i hooked up my laptop to ecm and aparently my vss is right but my speedo is all over the place, usually 5 mph off, and rarely it shudders (where it randomly freaks out for a 10th of a sec) so i was wondering if my speedo is dying or what could be the problem. im still gonna check the vss out with my friends cop car's certified speedo to see if thats on the dot or not. any ideas?
) i hooked up my laptop to ecm and aparently my vss is right but my speedo is all over the place, usually 5 mph off, and rarely it shudders (where it randomly freaks out for a 10th of a sec) so i was wondering if my speedo is dying or what could be the problem. im still gonna check the vss out with my friends cop car's certified speedo to see if thats on the dot or not. any ideas? 
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
No direct idea, but I would imagine you're going to have to get the VSS on a scope or some type of datalogger to get an idea of pulses vs. time/speed.
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