Spark Knock
- Perform QUICK TEST. See TESTS W/CODES - 2.5L article.
- Check cooling system for overheating.
- Check ignition system. See CIRCUIT TEST JB in TESTS W/CODES - 2.5L article.
- Check for vacuum leaks.
- Check EGR system. See CIRCUIT TEST HE in TESTS W/CODES - 2.5L article.