Diagnostic Aids

Water or foreign material in fuel can cause no-start condition during freezing weather. Engine may start after 5-6 minutes in heated shop. Problem may not reoccur until vehicle is parked overnight in freezing temperature. Low fuel pressure can result in a very lean air/fuel ratio. Fouled or damaged spark plugs will also cause a no-start condition. See TESTS W/O CODES article in this section.

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

Courtesy of GENERAL MOTORS CORP.

Fig 2: Chart A-3 Flow Chart - Engine Cranks But Will Not Run

Courtesy of GENERAL MOTORS CORP.