Engine Spark Knock or Ping

CONDITION
^ Engine spark knock or ping

POSSIBLE SOURCE
^ EGR valve malfunction.
- Perform EGR valve functional diagnosis.

^ EGR valve attaching nuts or bolts loose or missing.
- Replace flange gasket and tighten valve attaching nuts or bolts to specification.

^ Blocked or restricted passages in valve or EVP spacer.
- Clean passages in EGR spacer and EGR valve.