Possible Causes
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Left side variable valve timing actuator is stuck in advance position
- Loose timing chain or improper valve timing
- PCM malfunction
- Spool valve in left side Oil Control Valve (OCV) is stuck in advance position