Navigator 4WD V8-5.4L SOHC VIN L (1998)
This TSB article is being republished in its entirety to add service parts, include a Part Application Chart, and to revise Figure 1.
ISSUE
The Malfunction Indicator Lamp (MIL) may illuminate and Diagnostic Trouble Code (DTC) P1506 may be stored in continuous memory and/or the
engine idle speed may be higher than expected. This may be caused by black plastic flash from idle air bypass hose becoming lodged in the Idle Air
Control (IAC) bypass valve.
ACTION
Refer to the Diagnostic Flow Chart (Figure 1) for diagnostic and servicing procedure.