Common Causes of Engine Stalling in 2002-2006 Nissan Altimas

1. Faulty Crankshaft Position Sensor

• The crankshaft position sensor is crucial as it monitors the position and rotational speed of the crankshaft.
• A malfunctioning sensor can produce inaccurate data to the engine control module, leading to engine stalling.

1. Fuel Pump Problems

• An inadequate fuel supply due to a failing fuel pump results in erratic engine operation or complete stalling.
• The pump might not deliver enough fuel pressure or volume to maintain proper engine function.

1. Dirty or Faulty Mass Air Flow Sensor (MAF)

• The MAF sensor measures the air entering the engine.
• A dirty or faulty sensor can cause an incorrect air/fuel mixture, contributing to stalling issues.

1. Defective Idle Air Control Valve

• The idle air control valve manages the engine's idling.
• If clogged or malfunctioning, it can disrupt the engine's ability to idle smoothly.

1. Problems with the Throttle Body

• The throttle body controls the amount of air flowing into the engine.
• Carbon buildup can impede butterfly valve movement, disrupting air intake and causing stalling.

1. Aged Spark Plugs or Ignition Coils

• Worn or malfunctioning spark plugs and ignition coils can result in incomplete combustion cycles.
• This can lead to misfires and stalling.

Steps to Address Engine Stalling in 2002-2006 Nissan Altimas

• Diagnose & Replace Malfunctioning Sensors

• Use an OBD-II scanner to retrieve error codes and pinpoint sensor issues.

• Replace faulty crankshaft position sensors and MAF sensors as required.

• Check & Repair Fuel Pump System

• Test the fuel pump's pressure and ensure it delivers the right amount of fuel.

• Replace the pump or filter if they are found lacking in capacity.

• Clean or Replace the Mass Air Flow Sensor

• Clean the MAF sensor with appropriate cleaner if dirt is the issue.

• Replace the sensor if cleaning doesn’t restore function.

• Service or Replace The Idle Air Control Valve

• Clean any buildup in the idle air control valve.

• Replace the valve if necessary to ensure smooth idling.

• Throttle Body Maintenance

• Inspect the throttle body for carbon buildup.

• Clean it if there is significant blockage to restore proper airflow.

• Ignition System Check

• Inspect and test spark plugs and ignition coils.

• Replace any components that show wear or malfunction to avoid misfires.

By addressing these common issues and symptoms of engine stalling, the longevity and reliability of the 2002-2006 Nissan Altima can be maintained. Always consider consulting an automotive professional if the problem persists.