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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - TBI >> Diagnostic Tests >> Code 45: Rich Exhaust Indication >> TPS

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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