LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Tach and Speedo gone wacked.. need help

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Old 11-10-2003, 08:01 PM
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Location: Cambridge, Ontario, CANADA
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Question Tach and Speedo gone wacked.. need help

My tach and speedo have gone crazy. When I start to accelerate they seem to just climb at an insane rate and sometimes they jump around. When I put my foot down the tach goes right to 7k pretty much and I know it should only be at like 3-4k and it doesn't take much to get the speedo up really high either. When I stop/idle both seem to work fine. They also SEEM to work properly sometimes but maybe not. Any ideas what to check? Car is 1997 M6 w/OBDI if it matters.
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Old 11-10-2003, 08:51 PM
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I would suspect a loose ground or battery cable connection.
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Old 11-10-2003, 09:03 PM
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Yep, bad ground. Clean the PCM ground, near the passenger side strut tower.
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