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  #1 (permalink)  
Old 07-28-2014, 08:42 AM
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Cobra Make, Engine: Superformance #2144 with a Roush 342R (sold June 2018, but still lurking on Club Cobra)
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Default Tachometer performance and battery ground

This is just a HEADS UP for tachometer performance possibly being affected by inadequate grounding of the battery.

The tachometer in my Superformance suddenly, and unexpectedly, began swinging wildly all over the scale with no change in throttle pressure. All other instruments continued to function as expected. I assumed it was time for a tachometer rebuild. In preparation for removing the tach. I started disconnecting the battery leads and noticed the negative terminal was barely attached to the chassis ground. I cleaned the battery terminals and secured the ground wire and started the car. Instantly, the tach. began working as expected with no erratic, or unexpected, movements. I have put over 200 miles on the car since the episode and the tach. continues to function as expected.
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Old 07-28-2014, 11:56 AM
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Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
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Default

Good to know and another thing to keep in mind for the future.
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FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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