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Home >> Chevrolet >> 1990 >> Forward Control 4.3 Z, Automatic, 3L80/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - TBI >> Diagnostic Tests >> Code 45: Rich Exhaust Indication >> TPS
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Code 45: Rich Exhaust Indication: TPS

An intermittent TPS output will cause the system to operate rich due to a false indication of engine acceleration.

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