Symptoms - Ignition System

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 INSPECTION and SPARK PLUG WIRE INSPECTION . 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 REPLACEMENT and CKP SYSTEM VARIATION LEARN PROCEDURE . Inspect the CKP Sensor and corresponding harness for electro-magnetic interference (EMI).