Shift Concern: Timing Concerns-Early/Late

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

POSSIBLE COMPONENT CHART

Possible Component	Reference/Action
211- ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, OSS sensor, IAT sensor	Carry out On-Board Diagnostic Tests. See INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article for diagnosis and testing of the PCM and IAT. GO to PINPOINT TEST E . Repair as necessary. Clear DTCs, road test and rerun On-Board Diagnostic Test.
Some Shifts Early/Late Only
Some Shifts Early/Late Only	If only some shifts are early/late, determine which shift(s) is missing. Refer to the following routine(s) for further No Shift concerns: Soft/Slipping 1-2 Shift, Routine 226 Soft/Slipping 2-3 Shift, Routine 227 Soft/Slipping 3-4 Shift, Routine 228 Soft/Slipping 4-5 Shift, Routine 272 Soft/Slipping 5-4 Shift, Routine 273 Soft/Slipping 4-3 Shift, Routine 229 Soft/Slipping 3-2 Shift, Routine 230 Soft/Slipping 2-1 Shift, Routine 221
Fluid
Incorrect level	Adjust to the correct level. Refer to TRANSMISSION FLUID LEVEL CHECK .
Condition	Carry out Fluid Condition Check. Refer to PRELIMINARY INSPECTION .
Main Control
Screws not tightened to specification	Tighten to specification.
Separator plate damaged	Inspect for damage. If damaged, install a new separator plate.
Contamination	Disassemble and clean.
Valve, springs damaged, misassembled, missing, stuck or bore damaged	If damaged or parts are missing, install new main control assembly. If misassembled, reassemble correctly. DO NOT stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.
Filter damaged or missing	Inspect for damage. Repair as necessary.
Overdrive Servo
Servo retaining screws damaged	Inspect for damage. Repair as necessary.
Seals (piston and cover) damaged	Inspect for damage. Repair as necessary.
Overdrive Band
Band damaged	Inspect for damage. Repair as necessary.
Servo worn or damaged	Inspect for damage. Repair as necessary.
Not adjusted correctly	Inspect for damage. Repair as necessary.