Re: EEC-V VSS readings way off - speedo OK
I have a similar issue - same symptoms, but only minor fluctuations (not up to 200km/h !!) It makes the trip meter spike up also (L/km) but speedo is ok. new VSS didnt fix, so I am going to try and install a ground wire from VSS to body, check all plugs/connectors and wiring. Whe the car is still, very occassionaly the speedo will fluctuate up to 20 or 60 kmh, but moving forward just a few cm's stops it, as does changing into another gear in the auto. btw - this is an Australian falcon, but still EECV. i will send email with a doc on OBDC strategys, with a good section on automatic transmission malfunction codes/sensors.
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