V8 Idle Speed

Idle speed is controlled by ECA and idle speed control air by-pass valve on all engines except 5.8L Crown Victoria and 5.8L Grand Marquis. If control system is operating properly, engine idle RPM is fixed and cannot be changed by standard adjustments. Many engines do not provide an RPM specification. A Scan tool must be used on these systems because the control strategy and idle speed specification is controlled by the ECA. See appropriate ADJUSTMENTS article.

Before performing idle speed adjustment procedure, complete a thorough basic inspection and self-test (KOEO, KOER, Continuous Memory self-tests) to confirm operation of sub-systems contributing to idle speed control problems. See appropriate TESTS W/CODES article in this section.