Manual:LAND ROVER Range Rover Supercharged 2015Page:48866 / 73010



3.0L AJ126 Misfire On New Replacement Or REMAN Units (SSM75971) — 2015 Land Rover Range Rover Supercharged Service Manual

3.0L AJ126 Misfire On New Replacement Or REMAN Units (SSM75971)

WARNING: This page is about the Range Rover Base, which is a different variant/trim than selected.
Publication date: 2023-03-27
Reference number: SSM75971

3.0L AJ126 MISFIRE ON NEW REPLACEMENT OR REMAN UNITS

3.0L AJ126 MISFIRE ON NEW REPLACEMENT OR REMAN UNITS

TECHNICAL SERVICE BULLETIN

Reference Number(s): SSM75971, Date of Issue:  March 27, 2023
LAND ROVER: Discovery/L462; Range Rover/L405; Range Rover Sport/L494; Range Rover Velar/L560
SERVICE CATEGORY: Engine

ISSUE

Land Rover has received reports of replacement new or remanufactured 3.0L AJ126 gasoline engines experiencing misfiring and/or rough running for the first few minutes after a cold start. In the majority of cases the misfiring has been primarily on the bank 2 (driver's side) cylinders, and most frequently reported on cylinders #4 and #6.

CAUSE

Unknown. Engineering is currently investigating the root cause of this concern and have identified that the affected engines may have valve clearances, and particularly exhaust valve clearances, that are below specification.

ACTION

Check the clearances of all valves and correct any discrepancies.

Submit an EPQR if valve clearances are not to spec and include the part number and serial number of the replacement engine.

If valve clearances have been checked and are within specifications, perform basic diagnostic procedures as outlined in the TOPIx workshop manual.

If further assistance is needed, please raise a TA