C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1990 Tach Bounce

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Old Jul 2, 2018 | 04:57 PM
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Default 1990 Tach Bounce

Put new clutch, single, in my 1990. Now the tach bounces when driving. Maybe loose ground? Any help or experience and fix appreciated. Thanks all.
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Old Jul 5, 2018 | 02:23 AM
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On '85-'89 the Wht wire out of the dist. goes through a tach filter which is fastened/grounded through the top left bell-housing bolt.
My engine builder forgot to attach my tach filter and the tach bounced around till I used a jumper wire to ground the tach filter.
Since you have an L98 I wonder if your problem is similar. The filter looks like a round metal capacitor with a hole for the bolt.
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Old Jul 6, 2018 | 01:29 PM
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Originally Posted by 65Z01
On '85-'89 the Wht wire out of the dist. goes through a tach filter which is fastened/grounded through the top left bell-housing bolt.
My engine builder forgot to attach my tach filter and the tach bounced around till I used a jumper wire to ground the tach filter.
Since you have an L98 I wonder if your problem is similar. The filter looks like a round metal capacitor with a hole for the bolt.
That was what mine was until I bypassed it. Still, it wasn't reading right so I had it recalibrated and it agrees with the ECM
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