Stalls After Starting

Symptom Definition

Engine starts okay but dies after brief idle, as soon as any load is placed on engine (such as turning on air conditioner or engaging transmission) or on initial drive-away.

Possible Causes & Corrections:

• Ensure hot air tube is connected to air cleaner.
• Check thermostatic air cleaner for proper operation.
• Check Idle Air Control (IAC) system for proper operation.
• Check PCV valve for proper operation.
• Unplug MAP sensor. ECM substitutes a default value for sensor signal. If stall condition is eliminated, replace sensor.
• Check EGR system for proper operation.
• If stall occurs when air conditioner is turned on, check for air conditioner clutch signal to ECM terminal. Voltage at A/C terminal of ECM should be battery voltage when air conditioner compressor clutch is engaged. A high voltage surge due to a shorted compressor clutch diode could cause ECM shutdown.
• Check for an overcharged A/C system.
• Check for plugged or restricted fuel lines.
• If engine starts but then immediately stalls, open distributor by-pass circuit. If engine now starts and runs okay, replace distributor pick-up coil.
• Using Spark Tester (ST-125), check for a weak spark from ignition coil.