Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 284 (ENGINE CONTROL SYSTEM - 3.8L - TROUBLESHOOTING & DIAGNOSIS)SYMPTOMS - IGNITION SYSTEM

2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Symptoms - Ignition System

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Symptoms - Ignition System

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Ignition System

Symptoms	Ignition 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 Lack of Power, Sluggishness or Sponginess Detonation/Spark Knock Hesitation, Sag, Stumble Cuts Out, Misses Poor Fuel Economy Rough, Unstable or Incorrect Idle and Stalling Dieseling, Run-On Backfire	Inspect for proper Ignition System operation. Refer to Electronic Ignition (EI) System Diagnosis . Inspect spark plugs and spark plug wires. Refer to Spark Plug Wire Inspection and Spark Plug Wire Replacement . Inspect the spark plugs for correct application. Refer to Ignition System Specifications .
Hard Start 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 the crankshaft position (CKP) sensor for the following: CKP sensor for damage and proper installation. Refer to Crankshaft Position Sensor (CKP) System Diagnosis . Inspect the CKP Sensor and corresponding harness for electro-magnetic interference (EMI).

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.