Engine
Engine Surging at Idle
Description
Idle RPM climbs and falls rhythmically — engine hunts for a stable idle. Often worse when the engine is cold.
Common Causes
Vacuum leak allowing unmetered air
Faulty idle air control valve or dirty throttle body
Dirty MAF sensor sending incorrect readings
Failed PCV valve causing vacuum fluctuation
Related Trouble Codes
P0100
Mass Air Flow Circuit Malfunction
Moderate
P0101
Mass Air Flow Circuit Range/Performance
Moderate
P0171
System Too Lean (Bank 1)
Moderate
P0172
System Too Rich (Bank 1)
Moderate
P0506
Idle Control System RPM Lower Than Expected
Moderate
P0507
Idle Control System RPM Higher Than Expected
Moderate
P2187
System Too Lean at Idle (Bank 1)
Moderate
P2188
System Too Rich at Idle (Bank 1)
Moderate
Was this information helpful?
Quick Info
| System | Engine |
| Related DTCs | 8 |