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Glenn
Glenn, Senior Master Ford Tech
Category: Ford
Satisfied Customers: 1746
Experience:  26 years exp with Ford Products, ASE Master Auto & Truck + advanced engine perf L1/L2 Gas & Diesel
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2002 E150 Van, with V6. Code P1131, Lack of Ho251 Switches

Resolved Question:

2002 E150 Van, with V6. Code P1131, Lack of Ho251 Switches Lean Bank 1. What would you look for to correct the problem.
Submitted: 8 years ago.
Category: Ford
Expert:  Glenn replied 8 years ago.

Hello there,

 

This is very common concern, you will need upper intake manifold seals and Bolts, there are seals around the bolts! Tsb is below.

 

 

TSB
05-22-6
  • MIL ON WITH DTC P1131 AND/OR P1151 - 4.2L ENGINE
Publication Date: October 21, 2005

FORD:2001-2003 E-150, E-250
2001-2004 F-150

This article supersedes TSB 05-17-3 to update the vehicle model years and issue.

ISSUE:

Some 2001-2003 F-150, 2004 F-150 Heritage and 2001-2003 E-150/250 vehicles equipped with a 4.2L engine may exhibit the malfunction indicator lamp (MIL) on with diagnostic trouble codes (DTCs) P1131 and/or P1151 (system too lean bank 1 or 2). This condition may be due to leaking isolator bolts/port gaskets in the upper-to-lower intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.

ACTION:

Refer to the following Service Procedure.

SERVICE PROCEDURE

NOTE:THIS CONDITION COULD ALSO BE DUE TO WARM AMBIENT TEMPERATURES AND THE USE OF WINTER GRADE FUELS WHICH HAVE VERY HIGH VOLATILITY AND MAY BOIL IN THE FUEL LINES (VAPOR LOCK) DURING A SHORT HOT SOAK. OXYGENATED FUELS WILL AGGRAVATE THIS CONDITION. IF NON-OXYGENATED FUEL IS NOT AVAILABLE, USE MID/HIGH OCTANE FUELS WHICH HAVE LOWER VOLATILITY AND MAY HELP ALLEVIATE THE CONDITION.

  1. Perform a self test. If DTC P1131 and/or P1151 are the only codes stored in the powertrain control module (PCM) proceed to Step 2. If any additional DTCs are present, follow normal diagnostic procedures found in the PC/ED Manual.
  2. Remove the upper intake and replace only the port gaskets (9H486) and isolator bolt assemblies (9S479). The new isolator bolt assemblies use a rubber material that is green in color, do not install the old isolator bolt assemblies with the black rubber material. Do not replace any other intake parts or gaskets. Refer to Workshop Manual, Section 303-01 (In-Vehicle Repair; Upper Intake Manifold) for removal and installation procedure.
  3. While the upper intake manifold is removed, check the exhaust gas recirculation (EGR) orifices that are pressed into each primary port of the lower intake manifold. If any of the orifices are plugged with soot, clean and unplug them with a pick and solvent.

    CAUTION:DO NOT USE SMOKE DETECTION, PROPANE GAS, CARBURETOR OR BRAKE CLEANER TO TEST FOR VACUUM LEAKS. CARBURETOR OR BRAKE CLEANER MAY CAUSE INTAKE MANIFOLD RUNNER CONTROL (IMRC) BEARING FAILURE. SOME LEAKAGE FROM THE IDLE AIR CONTROL (IAC) OR EGR VALVE AND IMRC SEALS IS NORMAL, DO NOT REPLACE THESE PARTS. DO NOT REPLACE THE LOWER ALUMINUM INTAKE MANIFOLD.

     


PART NUMBERPART NAME
1L3Z-9H486-AAPort Gasket
3F2Z-9S479-AAIsolator Bolt

 

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