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For the first two years of owning my Rover SD1 Efi Twin Plenum Vitesse, I experienced an intermittent corrupted "Instant mpg" fuel consumption reading on the trip computer. Basically, the normal readings intermittently showed a much lower figure than was either possible or likely.

For example, at a steady cruising speed of about 55 mph in fifth gear, the "Instant mpg" would intermittently never show more than 28 mpg and never more than 45 mpg on engine over-run.

For months I presumed there was an intermittent fault within the fuel management system, testing everything conceivable but with no resolution. Even after replacing the ECU for a different reason the intermittent fault remained, so I turned my attention to the trip computer readout system itself.

This essay explains the cause of the problem and how to fix it.

Read or download the document in PDF format from here: (88kb)

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Corrupted Fuel Consumption Reading on Rover SD1 Efi Cars

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