Symptoms - Sensors/Systems. Pontiac Montana SV6 2006

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2006 🢒 Montana SV6 🢒 General Information 🢒 Vibration Diagnosis and Correction 🢒 Symptoms - Sensors/Systems

Sensor/System

Symptoms

Sensor/System

Find the symptom in the left column and perform the test/inspection procedure in the right column. Be sure to review each cell of the table to identify all tests for a symptom.

•	Hard Start

•	Surges/Chuggles

•	Hesitation, Sag, Stumble

•	Cuts Out, Misses

•	Poor Fuel Economy

•	Rough, Unstable, or Incorrect Idle and Stalling

•

Backfire

•	Inspect the mass air flow (MAF) sensor for proper installation, obstruction, contamination, and damage. Refer to Mass Airflow Sensor Replacement .

•	Inspect the MAF sensor for proper seating of the connector and terminals.

•	Inspect the manifold absolute pressure (MAP) sensor for proper installation, obstruction, and damage. Refer to Manifold Absolute Pressure Sensor Replacement .

•	Ensure the quality of the MAP sensor vacuum source.

•	Hard Start

•	Detonation/Spark Knock

•	Hesitation, Sag, Stumble

•	Poor Fuel Economy

•	Rough, Unstable, or Incorrect Idle and Stalling

•	Inspect for vacuum leaks and other unmetered air. Refer to Emission Hose Routing Diagram .

•	Test the engine coolant temperature (ECT) sensor for being shifted in value. Refer to the Temperature Versus Resistance .

•	Surges/Chuggles

•	Lack of Power, Sluggishness, or Sponginess

•	Detonation/Spark Knock

•	Poor Fuel Economy

•

Backfire

Monitor the Knock Sensor (KS) System for excessive spark retard activity. Refer to the knock sensor description within the Electronic Ignition (EI) System Description .

Hesitation, Sag, Stumble

•	Inspect the accelerator pedal position (APP) sensor and the related wiring. Refer to Throttle Actuator Control (TAC) System Description .

•	Inspect the Throttle Actuator Control (TAC) System for proper operation.

•	Surges/Chuggles

•	Lack of Power, Sluggishness, or Sponginess

•	Hesitation, Sag, Stumble

•	Cuts Out, Misses

•	Poor Fuel Economy

•	Rough, Unstable, or Incorrect Idle and Stalling

•

Backfire

Inspect for contaminated oxygen sensor (O2S).

Poor Fuel Economy

Inspect for proper operation of the speedometer. Refer to Speedometer and/or Odometer Inaccurate or Inoperative .