Bulletin No.:

Service Bulletin

Date:

13-06-01-002A
August, 2020

TECHNICAL
Subject:

Conversion of Engine RPO LZG or LZ8 with Active Fuel Management to Non AFM
Lifters

Models:

2007 Chevrolet Impala VIN Code R (RPO LZ8)
2008 Chevrolet Impala VIN Code 3 (RPO LZG)
Equipped with 3.9L Engine
This bulletin has been revised to update the Subject and the Warranty statement.
Please discard Corporate Bulletin Number 13-06-01-002.

Condition

Correction

Some customers with the 3.9L AFM engine (RPO LZ8
or LZG) may experience a condition that requires the
camshaft and/or lifters to be replaced.

1. Remove the engine from the vehicle. Refer to
Engine Replacement in SI.
2. Remove the lifters from the engine. Refer to Valve
Lifter Removal in SI. Discard the 6 AFM valve
lifters and the valve lifter guide. Retain the 6
non-AFM lifters in the order they were removed for
re-assembly.
3. Remove the camshaft from the engine. Refer to
Camshaft Removal in SI.
Note: When removing the camshaft, inspect the timing
chain tensioner for excessive wear or damage. Replace
as necessary.

Cause
The AFM lifter is no longer being manufactured and the
engine has to be converted to a non AFM engine. This
conversion kit contains camshaft lifters and a block off
plate for the oil flow to the Lifter Oil Manifold Assembly
(LOMA). The kit also contains the necessary seals and
gaskets required to replace the camshaft.

Important Disclosure of Conversion
Impact
This conversion is being offered to customers who
are out of warranty and want the option of
deactivating AFM instead of incurring the cost of a
replacement engine.
Deactivation of AFM will reduce the vehicle's fuel
economy. The negative impact might be 1 mpg or
more during highway driving. The actual impact will
depend upon a variety of factors, including vehicle
speed, vehicle load, road conditions and driver
behavior. The engine may also run quieter or idle
smoother after the conversion.
Before installing this conversion kit, you must
inform the customer of the conversion impact,
include the above information on the repair order,
and have the customer sign the repair order.

Copyright 2020 General Motors LLC. All Rights Reserved.

4. Install the new camshaft. Refer to Camshaft
Installation in SI.
5. Install the lifters into the engine. Refer to Valve
Lifter Installation in SI. Install the 6 non-AFM lifters
and lifter guide removed during disassembly into
the same lifter bores they were removed from.
Install the 6 NEW lifters and lifter guide included in
the conversion kit into the AFM lifter bores.

Page 2

August, 2020

3346615

Important: Discard the valve lifter guide retainer (2)
and bolts (1). They are not used during assembly.

Bulletin No.: 13-06-01-002A

9. Install the altered/modified vehicle label included
with the conversion kit. The label should be placed
on the RH passenger side top of strut tower. The
surface should be clean and free of grease/dirt
before applying label.
10. Disable and tape the 12V supply wire to the
LOMA unit:
• Reference Inline Harness Connector End Views
electrical connector end view for 16 way engine
harness to fuel injector harness electrical
connector C102 (2007 MY) or X102 (2008 MY).
• Cut the pink/black wire, circuit 5294, located at
terminal “M.” Use electrical tape to seal the end
of the cut wire. Tuck the cut end of the wire
back into the plastic wiring loom and secure
with electrical tape.
11. Reprogram the ECM with the calibration for
converting from AFM to Non-AFM operation by
contacting the Techline Customer Support Center
(TCSC) at 1-800-828-6860 (English) or
1-800-503-3222 (French) to obtain a VCI number.
After the update, the technician can select ECM
from the Supported Controllers screen in SPS and
program as Normal.
Note: After the conversion calibration has been
installed, the AFM data will read “0” and any circuit
tests will read “FAULT” and the DIC cylinder mode
monitoring with stay in "6" cylinder mode” at all times
after the new calibration is programmed into the
vehicle. This is considered normal with this conversion
calibration.

Parts Information
Part Number

Description

19299225

Conversion Kit

Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
3424436

6. Install the LOMA oil block off plate (3) between the
LOMA gasket assembly (4) and LOMA unit (2) and
install LOMA on the engine with LOMA bolts (1).
Tighten the bolts (1) to specifications contained
within SI.
7. Finish the engine assembly.
8. Install the engine to the vehicle. Refer to Engine
Replacement in SI.

Labor
Operation

Description

Labor
Time

4064698*

Camshaft Replacement
(Conversion Calibrations
Included)

9.5 hrs

*This is a unique Labor Operation for bulletin use only.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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