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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

speedometer issue

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Old 05-12-2012, 09:09 AM
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Default speedometer issue
hey guys i have an a4 96 trans am and sometimes when im driving slow in reverse and sometimes while driving slow in drive the speedometer will shoot up to 150 then back down. any ideas on what this could be?
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Old 05-12-2012, 10:16 AM
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Ever get the car tuned after the 3.73 gear change?
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Old 05-12-2012, 11:46 AM
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Yes i did this started a littlw while after
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Old 05-13-2012, 08:32 AM
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anything? could it be the vss?
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Old 05-13-2012, 11:54 AM
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VSS is what controls the speedometer. It picks up the tailshaft speed. I've never seen anyone say one has gone bad. Although I don't usually read speedometer problem threads.

Let someone else chime in.
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Old 05-15-2012, 07:31 AM
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anyone else?
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Old 05-15-2012, 08:37 AM
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Usually if the VSS goes bad it will read 0, not peg out.
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Old 05-15-2012, 04:44 PM
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alright so vss is out, any other possible reasons why it shoots up?
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Old 05-20-2012, 08:47 AM
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anyone?
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Old 05-20-2012, 09:21 AM
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pull the sensor and make sure there is no build up or metal stuck to it.
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