2001 Ford Escape V6 3.0L with engine code P1506

Question

How to fix it erratic idle unable to control RPM for smog goes up but unable to maintain at 2500 RPM for smog.

Answer 1

The P1506 code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
If the problem persist, the IAC valve may need to be replaced.

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