Section 7 (Engine Control System - 1.8L (LNK) - Troubleshooting & Diagnosis): Backfire

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Backfire

Checks	Action
DEFINITION: The fuel ignites in the intake manifold, or in the exhaust system, making a loud popping noise.
Preliminary Check	Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information. Refer to Symptoms - Engine Controls .
Ignition System Checks	Check for the proper ignition coil output voltage with a J 26792 Spark Tester or equivalent. See Special Tools . Inspect the spark plugs for correct operation and good ignition system performance. Refer to Spark Plug Inspection . Inspect the ignition coil boots for damage.
Engine Mechanical Checks	Check for any of the following engine mechanical problems: Any broken or weak valve springs A low compression Any sticking or leaking valves An incorrect valve timing An incorrect or worn camshaft Refer to Symptoms - Engine Mechanical in Engine Mechanical. Check the intake and the exhaust system for casting flash or other restrictions.