Idle control system RPM higher than expected

Conditions that can produce P0507

These are diagnostic branches, not a ranked parts list. Prevalence and testing order depend on the exact vehicle and failure scene.

• Vacuum or crankcase-ventilation leak
• Throttle plate contamination, damage, or adaptation issue
• Idle-air path or valve problem where equipped
• Purge valve flow at idle
• Incorrect relearn, cable adjustment, or mechanical condition

What to inspect next

1. Confirm the controller is actually commanding normal idle
2. Compare throttle, airflow, MAP, fuel trim, purge, and RPM
3. Inspect for unmetered air
4. Perform only the exact approved throttle/idle relearn

Evidence that strengthens the answer

Verify the repair

Preserve the pre-repair record, document exactly what changed, then repeat the relevant operating condition safely. Confirm no current or pending fault returns, review permanent-code and readiness state where applicable, and state which tests or modules remained unavailable.