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, Flow Chart, Cranks But Won't Run (1 of 2)

Courtesy of GENERAL MOTORS CORP.

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

Courtesy of GENERAL MOTORS CORP.

Fig 3: Chart A-3, Schematic, Cranks But Won't Run

Courtesy of GENERAL MOTORS CORP.