• HEADINGS
  • INTRODUCTION
    • MODEL IDENTIFICATION
  • ADJUSTMENTS
    • ENGINE MECHANICAL
    • VALVE CLEARANCE
      • Valve Clearance Adjustment
    • IGNITION TIMING
    • IDLE SPEED & MIXTURE
      • Cold (Fast) Idle
      • Idle Adjustment Procedures
    • THROTTLE POSITION (TP) SENSOR
• FIGURES
• TABLES
  • MODEL IDENTIFICATION

D - ADJUSTMENTS - 4.0L

1996 ENGINE PERFORMANCE Ford Motor Co. - On-Vehicle Adjustments

INTRODUCTION

MODEL IDENTIFICATION

MODEL IDENTIFICATION

Series (1)	Model
"U"	Explorer
(1) Vehicle series is fifth character of VIN.

ADJUSTMENTS

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

VALVE CLEARANCE

NOTE:

Valve cover(s) must be removed before performing valve adjustment. See the 4.0L article in the ENGINE MECHANICAL section for removal and installation procedures.

Valve Clearance Adjustment

NOTE:

Hydraulic valve lifters and nonadjustable rocker arms are used; valve adjustment is not possible. If valve lifters are found to be excessively worn or noisy, test and repair or replace as necessary.

IGNITION TIMING

Ignition timing on models equipped with EEC-V is not adjustable.

IDLE SPEED & MIXTURE

NOTE:

Idle mixture is not adjustable. If idle mixture is incorrect, see the TESTS W/CODES - 4.0L article.

Cold (Fast) Idle

Fast idle speed is controlled by the PCM. Adjustment is not required.

Idle Adjustment Procedures

CAUTION:

When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See the COMPUTER RELEARN PROCEDURES article in the GENERAL INFORMATION section before disconnecting battery.

Idle speed is not adjustable. If engine idle is not near specification, check for contaminated fuel, vacuum leaks and incorrect ignition timing. Ensure throttle bore, EGR system and PCV system are clean. If these are okay, see the TESTS W/CODES - 4.0L article for additional procedures.

THROTTLE POSITION (TP) SENSOR

NOTE:

Throttle Position (TP) sensor is not adjustable. If TP sensor service is required, see procedures under CIRCUIT TEST DH in the TESTS W/CODES - 4.0L article.