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