Diagnostic Aids

Water or foreign material in fuel can cause a no-start condition or lack of power. Sticking EGR valve may cause a low air/fuel ratio, resulting in a no-start condition, if system does not enter clear flood mode. Low fuel pressure can lower air/fuel ratio, resulting in a no-start condition.

Fig 1: Chart A-3 Schematic - Engine Cranks But Will Not Run

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart A-3 Flow Chart (1 Of 2) - Engine Cranks, Won't Run

Courtesy of GENERAL MOTORS CORP.

Fig 3: Chart A-3 Flow Chart (2 Of 2) - Engine Cranks, Won't Run

Courtesy of GENERAL MOTORS CORP.