Ranger 2WD V6-245 4.0L VIN X SFI (1997)
Intake Manifold: Customer Interest
Engine - Rough Idle/Stalling At Idle/Codes Stored
Article No.
98-6-8
03/30/98
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ROUGH IDLE - MALFUNCTION INDICATOR LAMP
(MIL) ILLUMINATED - DIAGNOSTIC TROUBLE
CODES (DTCS) P0171, P0174, P1131 AND/OR P1151
STORED IN MEMORY - 4.0L ENGINES ONLY
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STALL - DURING IDLE - MALFUNCTION INDICATOR
LAMP (MIL) ILLUMINATED - DIAGNOSTIC TROUBLE
CODES (DTCS) P0171, P0174, P1131 AND/OR P1151
STORED IN MEMORY - 4.0L ENGINES ONLY
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LAMP - MALFUNCTION INDICATOR LAMP (MIL)
ILLUMINATED - DIAGNOSTIC TROUBLE
CODES (DTCS) P0171, P0174, P1131 AND/OR P1151
STORED IN MEMORY - 4.0L ENGINES ONLY
LIGHT TRUCK:
1997 AEROSTAR, RANGER
This TSB article is being republished in its entirety to correct the part number listed, revise the Service Procedure, and add Aerostar.
ISSUE:
A rough idle, stalling at an idle and/or Diagnostic Trouble Codes (DTCs) P0171, P0174, P1131, and/or P1151 may be stored in memory on some
vehicles with a 4.0L engine. This may be caused by the gasket located between the fuel rail and lower intake manifold losing its compressive loading and
becoming drawn into the intake manifold runners resulting in a vacuum leak.
ACTION:
Replace the fuel rail-to-intake manifold paper gasket with a revised gasket. Refer to the following Service Procedure and the 1997 Ranger or Aerostar
Service Manual for removal and replacement procedures.
SERVICE PROCEDURE
1.
Remove the upper intake manifold and inspect the O-ring style gaskets on the mounting surface of the upper intake manifold. If the gasket bead is
above the intake surface and is not torn, do not disturb the gasket. If any of the O-ring gaskets are torn or do not protrude beyond the mounting
surface of the upper intake manifold, the gasket should be replaced.
2.
Remove six (6) studs and lift oft fuel rail manifold and paper gasket.
3.
Inspect all holes in the lower intake manifold to make sure there is no debris.
4.
Replace the Gasket (F8PZ-9E436-AA) (bright green paper and blue bead) and set the fuel rail manifold on the gasket. No paper gasket is needed
on the top side of the fuel rail manifold.
5.
Lubricate the lower portion of the stud bolts with a light grade oil such as 5W30 and torque the bolts to 14 +/- 2 N.m (10 +/- 1.5 lb-ft) using the
torque sequence shown in Figure 1.
6.
The upper intake manifold should be installed and the nuts torqued to 25 Nom (18.5 lb-ft) using the torque sequence shown in Figure 1.
7.
Start and warm the engine.
