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TSB
98-21-21
  • IDLE - FAST IDLE SPEED AND/OR DIAGNOSTIC TROUBLE CODE (DTC) P1506 STORED IN MEMORY - VEHICLES BUILT WITH 4.6L, 5.4L, OR 6.8L ENGINE
  • MALFUNCTION INDICATOR LAMP (MIL) - MIL ILLUMINATED AND/OR FAST IDLE SPEED WITH DIAGNOSTIC TROUBLE CODE (DTC) P1506 STORED IN MEMORY - VEHICLES BUILT WITH 4.6L, 5.4L, OR 6.8L ENGINE
  • LAMP - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED AND/OR FAST IDLE SPEED WITH DIAGNOSTIC TROUBLE CODE (DTC) P1506 STORED IN MEMORY - VEHICLES BUILT WITH 4.6L, 5.4L, OR 6.8L ENGINE
Publication Date: OCTOBER 19, 1998

LIGHT TRUCK:
1997-1998 ECONOLINE, EXPEDITION, F-150, F-250 LD
1998 NAVIGATOR

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.

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