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RPM Fluctuations or Idle Surging
RPM or Idle Jumping Around? It’s Not Always a Sensor.
Intermittent RPM fluctuations or idle surging can be caused by:
- Cam/crank correlation issues
- Ignition dropout
- IAC or throttle body faults
- Vacuum leaks or unmetered air
- Software errors or adaptations gone wrong
RPM instability at idle or under light load is often a symptom—not a cause. Fluctuations like surging, stalling, or inconsistent idle speed are usually tied to control system faults, electrical signal noise, or unseen mechanical influences.
At Keeney Auto & Diesel, these issues aren’t masked with “relearns” or replaced parts based on guesses. Instead, sensor data is recorded, throttle and ignition behavior is measured in real time, and signal integrity is analyzed to find what’s actually wrong.
Whether the fix is a re-grounded sensor harness or identifying a failing idle control valve the scan tool missed, the root cause gets handled directly.
