Engine - Hooting Noise

Article No.
95-7-12

04/10/95

^ IDLE AIR CONTROL VALVE (IAC) FRESH AIR SUPPLY TUBE - "HOOTING" NOISE FROM THE ENGINE COMPARTMENT AND/OR HIGH IDLE - VEHICLES BUILT FROM 3/1/93 THROUGH 11/1/94 - 7.5L ENGINE

^ NOISE - "HOOTING" - FROM THE ENGINE COMPARTMENT AND/OR HIGH IDLE - IDLE AIR CONTROL (IAC) VALVE FRESH AIR SUPPLY TUBE - VEHICLES BUILT FROM 3/1/93 THROUGH 11/1/94 - 7.5L ENGINE

LIGHT TRUCK:
1993-95 ECONOLINE, F SUPER DUTY, F-250, F-35O, F-47

This TSB is being republished in its entirety to include the 1995 model year.

ISSUE:
During highway deceleration or engine start-up, there may be a "Hooting" noise coming from the engine compartment and/or higher than normal engine idle speed. This may be caused by a resonance in the fresh air supply tube to the IAC Valve (brought on by the IAC Valve pintle bouncing).

ACTION:
Check for any loose vacuum lines and repair as necessary. If the noise persists, install an Expansion Chamber Hose Assembly to break up the resonance wave and IAC valve pintle bouncing, and install a new IAC valve.

PART NUMBER PART NAME
F5TZ-9F763-A Expansion Chamber Tube - F-Series
F5UZ-9F763-B Expansion Chamber Tube - Econoline
F2LY-9F715-A Idle Air Control Valve

OTHER APPLICABLE ARTICLES: NONE

SUPERSEDES: 94-26-11

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
950712A Time To Replace IAC Valve 0.3 Hr.
And Install New Hose -
F- Series
950712B Time To Replace IAC Valve 0.4 Hr.
And Install New Hose -
Econoline

DEALER CODING
BASIC PART NO. CONDITION CODE
9F715 56

OASIS CODES: 497000, 619400, 702000, 702100, 702300