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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L80-E >> Diagnostic Charts - Diesel >> Chart A-3, Engine Cranks But Will Not Run >> Diagnostic Aids

Diagnostic Aids

If no problem is found in fuel pump circuit or ignition system and cause of a "ENGINE CRANKS BUT WILL NOT RUN" has not been found, check for: water or foreign material in fuel system, and/or a basic engine problem.

NOTE: If crankshaft position sensor and optical sensor are disconnected or inoperable at the same time this will cause an "ENGINE CRANKS BUT WILL NOT RUN" condition.
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