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Home >> Chevrolet >> 1990 >> Caprice Base, 5.7 7 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Ignition/Crank Signal
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Ignition/Crank Signal

The ECM looks at the initial cranking (RPM) signal on circuit No. 430 to determine when the engine is being started. This information is used for starting enrichment. If this signal is not available on EFI vehicles, hard starting may result.

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