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I have a problem with my 1990 corvette electronic dash display. It goes nuts! Fuel goes from full to empty, amounts display metric to standard, speedometer goes blank etc etc etc... where do I start( to look for the cause) ?? thanks! ( all suggestions will help!)

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Hi, corrosion is a problem with late-model corvette cars that have digital displays. Over time, the cluster---the main component of the digital dash---can corrode and break with use. According to Corvette Magazine Online, corrosion frequently occurs where the rear circuit board connects with the front circuit board. A corroded cluster can alter the performance of the digital dash, resulting in display that blinks, malfunctions or even goes entirely black. When these problems occur, the solution consists of replacing the cluster.

Posted on Jan 01, 2011

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This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
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After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
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At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
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In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
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