MSD 2957 Installation
Atomic LS Master Truck EFI Kits
DANGER
PN 2957 - 3-Bolt Manifold
PN 2958 - 4-Bolt Manifold
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Thank you for selecting the Atomic LS Truck EFI System! MSD’s Atomic EFI systems are designed
with two major goals; to simplify installation of EFI and deliver better overall performance from your
engine. Simplicity is achieved through wired-less technology to ease installation plus the Atomic is
simple to program with no PC required! Performance is delivered through advanced control of the
fuel and ignition, just as you’d expect from MSD.
Parts Included:
2 - Fuel Rail Assemblies
1 - Power Module
1 - Handheld Monitor
1 - Wideband O2 Sensor
1 - Weld - in O2 Sensor Bung, Plug, and Crush Washer
1 - CAN Cable
1 - Power Module Main Harness
1 - Power Harness
1 - Cam Sensor Harnesses 4x (PN 2958)
2 - Cam Sensor Harnesses 1x & 4x (PN 2957)
1 - Crank Sensor Harnesses 58x (PN 2958)
2 - Crank Sensor Harnesses 24x & 58x (PN 2957)
1 - MAP Sensor Harnesses (PN 2957)
2 - MAP Sensor Harnesses (PN 2958)
1 - TPS Harness
1 - VVT Harness (PN 2958)
4 - Delphi Injector Harnesses (PN 2957)
4 - EV6 Injector Harnesses (PN 2958)
1 - IAT Sensor and Grommet
1 - 4GB Micro SD Card
4 - Grommets, Sleeves, and Mounting Screws
4 - Fuel Rail Brackets
8 - Injector Retainer Clips
8 - Short Spacers, Black (PN 2957)
8 - Long Spacers, Black (PN 2958)
4 - 6mm x 16mm HEX Head Bolts
8 - 6mm x 12mm Bolts
4 - 6/32” Socket Head Cap Screws
8 - 8/32” Socket Head Cap Screws
8 - M6 x 90mm Intake Bolts (PN 2957)
8 - M6 x 100mm Intake Bolts (PN 2958)
8 - #12 Washers
2 - 90º - 6AN Fittings
1 - 18” High Pressure Fuel Hose
2 - Fuel Rail End Caps
Parts Required, Not Included:
Fuel System: Fuel Pump, Fuel Filter,
Injectors, Injector O-Rings,
Regulator, and Fuel Line.
Thread sealer for intake bolts.
Not legal for use on pollution controlled vehicles: The MSD Atomic EFI system is not CARB
approved for use on emission controlled vehicles.
modifications must be carried out by a qualified automotive technician. Installation of fuel system
parts requires handling of gasoline. Ensure that work is performed in a well ventilated area with an
approved fire extinguisher nearby. Extinguish all open flames, prohibit smoking and eliminate all
sources of ignition in the area of the vehicle before beginning the installation. When working with
fuel systems, eye goggles and other safety apparel should be worn to protect against debris and
sprayed gasoline. The finished work must be thoroughly checked to ensure there are no fuel leaks.
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
WARNING
Installation of this product requires detailed knowledge of automotive systems
and repair procedures. Installation of fuel system parts and any fuel tank
2 INSTALLATION INSTRUCTIONS
FGH
DLPHI
DLPHI
CAPABILITIES
The Atomic LS Truck kit is designed to fit the original equipment (OE) 3-bolt and 4-bolt throttle body
truck intakes. The Atomic LS Truck is a self integrated Fuel and Ignition controller for GEN-III and
GEN-IV motors that requires no programming with a PC. The interface is controlled through a supplied
hand held controller. The ECU only needs basic configuration information. Once the engine warms
up to operating temperature, the ECU tunes itself using a basic configuration to ensure the best
performance and throttle response for your engine. The atomic will adjust timing and fuel curves on
the fly which in turn produces the smoothest idle, best fuel economy, and superior wide open throttle
performance at all times. This also means that weather and altitude changes aren’t a problem with this
system. The Atomic LS Truck kit supports the factory Variable Valve Timing (VVT) configuration as well.
The Atomic LS Truck kit uses all OE sensors with the exception of the wideband O2 sensor. The
Atomic LS Truck system only supports a cable driven throttle body at this time.
Note: The 4-bolt electronic control throttle body will have to be converted to a cable drive throttle
body like the MSD PN 2940.
COMPONENTS
Power Module: The Power Module of the Atomic LS is the communication
hub of the system and provides the high current fuel pump circuit
and other input/outputs for optional features. The unit has two
ports for the MSD CAN system as well as a wiring harness. There
are connections for the WB02, the Handheld Monitor as well as
Rail Power and CAN communication to the integrated fuel rails.
Handheld Programmer: The Atomic LS Truck kit is a self-tuning fuel and
ignition control system. The system only needs the basic engine
configuration information to build a fuel table for the engine. The
Handheld Programmer is used to enter all the engine parameters
into the ECU, and uses the MSD CAN to communicate with the
ECU. Once the engine has been started and warmed up to operating
temperature, the ECU will monitor the sensors. The ECU will then adjust
the fuel tables and ignition in order to maintain a properly running engine.
Fuel Rails/ECU: The Fuel Rails/ECU is combination of the electronics that drive
an ECU and a fuel rail assembly built into one unit. All of the engine sensor
connectors (except for the wideband O2 which connects to the Power
Module directly) are found on the fuel rails. The fuel rails are equipped
with -6AN fittings, but will accept -8AN fittings (the internal rail orifice is
the same diameter as the -8AN).
Drivers Side Fuel Rail Passenger Side Fuel Rail
EFG
Power
Module
Handheld
Programmer
DLPHI
DLPHI
FGH
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INSTALLATION INSTRUCTIONS 3
PREPARING THE INTAKE MANIFOLD FOR
INSTALLATION OF THE ATOMIC LS FUEL RAILS
The intake manifold must be modified in order to install the Atomic
LS fuel rails. Removal of the intake manifold for modification and
installation of the fuel rails is recommended but not required. If
care is taken while the intake is removed from the motor, the intake
gaskets can be reused.
•Cutthemountingbossesthatholdthefactoryfuelrailsoff.(Figure
1a and Figure 1b).
•Usingadriftpinoracenterpunch,knockthefactoryboltsout
of the centering bushing used to align the intake on eight of the
ten intake bolts/bushings (Figure 2). Take care not to damage
the centering bushings as they will be reused with the new intake
bolts.
Note: If the manifold is modified on the motor, plug the injector
bosses to prevent debris falling into the motor.
Figure 1a
FUEL RAIL INSTALLATION (3 AND 4-BOLT
THROTTLE BODY INTAKE MANIFOLD)
1. Preassemble the rail brackets with the spacers and centering
bushing. Coat the ends of the bolts with thread sealant.
2. The angled end of the bracket is always facing to the left when
installed correctly on either side of the engine (Figure 3).
NOTE: The spacers for the 4-bolt intakes are slightly longer
than the 3-bolt spacers.
4-BOLT
SPACER
ANGLED
END
Figure 1b
Figure 2
Figure 3 3-Bolt and 4-Bolt
Intake Configuration.
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4 INSTALLATION INSTRUCTIONS
FRONT
1ST PASS: 42 IN LB - 44 IN LB
2ND PASS: 87 IN LB - 89 IN L2
Figure 4 Intake Manifold Torque Specifications.
3. One of the fuel rails is shorter than the
other. The shorter rail is installed on
the driver side of the engine (Figure
5).
4. Lubricate the o-rings on the injectors with
some motor oil or silicone lubricant.
Install the clips onto the injector before
they are pushed into the fuel rail bung.
The injector clip will automatically secure
the injector to the rail.
5. Push the fuel injectors into the bung
without forcing them on. The injectors
should slide in easily (Figure 6).
6. Plug the fuel injector pigtails into the fuel
rail connections (Figure 7).
7. Connect the fuel injector pigtails into the injectors. The
long wires connect to the injectors on each end of the
fuel rail. The short wires connect to two inner injectors
(Figure 8).
8. Plug the FPS (fuel pressure sensor) connector into the
fuel pressure sensor under the fuel rail (Figure 9).
9. Connect the CAN cable from one rail to the other
(Figure 10).
10. Connect the heavy red Rail Power wire together
between the two rails (Figure 11).
11.Repeat steps 3-6 for the passenger side fuel rail
assembly.
NOTE: The Driver Side Rail is SHORTER
than the Passenger Side Raile.
PASSENGER SIDE
PASSENGER SIDE
DRIVER SIDE
DRIVER SIDE
Figure 5 Fuel Rail Length.
Figure 6 Injector Clips.
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INSTALLATION INSTRUCTIONS 5
Figure 8 Injector Pigtail.
Figure 7 Injector Rail
Connection.
Figure 9 Fuel Pressure Sensor.
Figure 10 CAN Cable.
12. Place the spacer/bushing/rail bracket assemblies onto the intake
manifold.
13. Use the torque sequence on page 4, Figure 4 to torque the
manifold bolts down correctly. Bolts #9 and #10 will use the stock
length bolts/bushings.
14. Check the rail brackets with a straight edge (Figure 12).
15. Install the rails onto the manifold. Use the supplied 6mm bolts to
secure the rails to the rail brackets. Torque to 85 in lb – 87 in. lb.
(Figure 13).
16. STOP. Visually inspect and ensure all the injectors are sitting evenly
and the injector o-rings are not pinched or visible. Failure to install
the injectors correctly can result in fuel leaks and engine fire.
17. Begin routing the sensor harnesses and plugging them into the
appropriate sensors.
18.
Line the end of the fuel rail cover up with the edge of the black
mold on the rear of the fuel rail (Figure 14). Slide the cover towards
the rear of the engine to engage the locking tabs on the fuel rail.
(Figure 15).
Figure 11 Rail Power.
Figure 12 Straight Edge Check of
Brackets.
END OF COVER /
EDGE OF BLACK
MOLD.
Figure 13 Rail to Bracket Bolts.
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Figure 14 Fuel Rail Cover.
6 INSTALLATION INSTRUCTIONS
COVER - TOP VIEW
END CAP
END CAP
8/32 SCREWS ON BACK OF COVER
6/32
SCREWS
6/32
SCREWS
19. Secure the rail covers onto the fuel rail with the
supplied 8/32 socket head cap screws (Figure 15).
20. Install the fuel rail end cap onto the cover and secure
it with the supplied 6/32 socket head cap screws.
FUEL RAIL COVER INSTALLATION
Figure 15 Fuel Rail Cover.
OVERVIEW
Follow these steps to install both covers. To remove the covers reverse the steps.
END CAP
6/32
SCREWS
1. Line the end of the fuel rail cover up with the edge of the black mold on the rear of the fuel rail (Figure 14).
2. Slide the cover towards the rear of the engine to engage the locking tabs on the fuel rail.
3. Install the 8/32 screws that secure the covers to the fuel rails.
4. Install the end caps and secure with the 6/32 screws.
SLIDE TOWARD REAR TO ENGAGE.
FRONT REAR
COVER - TOP VIEW
END CAP
6/32
SCREWS
8/32 SCREWS ON BACK OF COVER
LOCKING TABS
EDGE OF
BLACK MOLD
FUEL RAIL/ECU WIRING
The Atomic LS Truck kit has several adapter harnesses in order for the kit to install with all the different
variations of the truck motors. These adapter harnesses plug into the connectors found on the rails
themselves. The IAC and TPS connectors are on both rails to accommodate the different throttle
body configurations.
Air Conditioning kick up (AC): When 12v is applied to this wire, the ECU will kick up the IAC count and
Fan #1 to compensate for the engine load change created by the air conditioning compressor.
Alternator: The kit is supplied with a harness that has two alternator connectors on one end. This is
done to accommodate the two different alternator ends used by GM. Identify which connector
is needed, and cut the other connector off. Use the heatshrink caps provided in the parts bag
to seal the wire end.
Cam Sensor: The kit supports both the 1x and 4x cam sensors. The easiest way to identify the cam
sensor on a stock engine would be by locating the sensor on the motor. The 4x sensor is
mounted on the timing chain cover. The 1x sensor is located on the back of the motor.
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INSTALLATION INSTRUCTIONS 7
Controller area network (CAN): The kit utilizes a CAN communication for wiring between the fuel
rails, Power module and Handheld Monitor.
Crank sensor: The kit supports both the 24x and the 58x crankshaft
trigger wheels. The easiest way to identify which crank trigger
wheel is in the motor, remove the starter, crank sensor (behind
the sensor), and look into the motor to identify the crank
trigger wheel (Figure 16).
Engine Coolant Temperature (ECT) sensor: The engine coolant
temperature is monitored by the ECU for fuel and ignition
adjustments in closed loop operation.
Fuel Pressure (FP) Sensor: The kit includes a fuel pressure sensor
which is already installed on the driver side fuel rail.
Idle Air Control (IAC) Sensor: The kit has a connector on each
rail to accommodate different intake styles. The sensor only
plugs into the driverside IAC connector.
Ignition Coils: The kit has a factory connector that will connect to
the factory coil bracket harness on each valve cover (not
Figure 16 Crank Shaft
Reluctors.
supplied with the kit). There is an extra ground wire with each
coil bracket connector that should be grounded to the back
of each cylinder head.
Injectors: The kit supports following injector part numbers -
Delphi connector (Figure 17) :
GM:17113553 AC Delco:17113553
GM:17113698 AC Delco:17113698
EV6 connector (Figure 18):
GM:12574927 AC Delco:217-1563
GM:12613411 AC Delco:217-3411
GM:12250681 AC Delco:217-1621
The kit does NOT support the following
flex fuel injector-
GM:12580426 AC Delco:217-1626
Figure 17 Delphi
Connector.
Figure 18 EV6
Connector.
Intake Air Temperature (IAT) sensor: The sensor is supplied in the parts bag. It is recommended
to install the sensor in the intake air track before the throttle body. A ¾” hole is required
for the sensor.
Map sensor: The kit supports the original equipment (OE) Delphi and Bosch sensors. A harness
is supplied for each sensor.
Oil Pressure (Oil) sensor: The kit utilizes the factory oil pressure sensor. There are different style
sensors, but the connector is the same between these sensors.
Power: The heavy gauge wire supplies 12v to both fuel rails from the power module.
Throttle Position (TPS) Sensor: The kit has a connector on each rail for the TPS sensor. This is
done for ease of installation and only the driver side connector is used. The kit only supports
a cable driven throttle body at this time and includes an adapter harness for the TPS sensor
used on a cable driven throttle body.
Wide Band O2 Sensor: A wide band O2 sensor is supplied with the kit. The O2 sensor is used by
the ECU to monitor air/fuel ratios (AFR) in the exhaust gases. Adjustments are made by
the ECU in closed loop to maintain (AFR).
Variable Valve Timing (VVT): The kit supports the VVT system. Plugs into VVT Connector on the
front of the timing chain cover in VVT capable engines.
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8 INSTALLATION INSTRUCTIONS
*INJECTORS ADAPTERS
ARE INTERCHANGEABLE.
(EV6 Adapters shown)
NOTE: Do not cross the
injector harnesses when
installing them on the
injectors.
PASSENGER
SIDE
MODULE
POWER
TO
Red - POWER
CAN
ETC/
A. Brown
B. Pink
C. Brn/White - Gnd
D. Not Used
V V T
D. Black - Coil 2B
E. Green - TPS1
F. Orange - 5V
G. Violet - TPS2
H. Not Used
A. Brown
B. Pink
C. Brn/White - Gnd
D. Not Used
E. Green - TPS1
F. Orange - 5V
G. Violet - TPS2
H. Not Used
ETC/TPS
D L PHI
D LPHI
IAT
IAC2
A. Black - Ground
B. Violet - Signal
A. Orange - Coil 1B
B. Gray - Coil 1A
C. Blue - Coil 2A
CURRENTLY
USED)
(NOT
A. Orange - Coil 1B
B. Gray - Coil 1A
C. Blue - Coil 2A
D. Black - Coil 2B
B. Yellow - Signal
ECT
IAC
Orange - AC
INJ2*
1. Signal
2. 12V
A. Black - Ground
1. Signal
2. 12V
INJ1*
INJ4*
1. Signal
2. 12V
1. Signal
2. 12V
INJ3*
MAP
A. Orange - 5V
B. Lt Green - Signal
C. Brown - Ground
F. Green - Coil 3
G. Tan - Coil 1
H. Pink - 12V
A. Pink - 12V
B. Orange - 5V
C. Brown - Ground
D. Brn/Wht - Signal
GROUND
CAM
Black
EFG
COILS
2, 4, 6, 8
C. Lt. Green - Coil 4
D. Not Used
E. Brown - Ref Gnd
F. White - Coil 6
G. Lt. Blue - Coil 8
H. Pink - 12V
A. Black - Ground
B. Blue - Coil 7
C. Brn/White - Coil 5
D. Not Used
E. Brown - Ref Ground
1, 3, 5, 7
COILS
H
F
G
Black - GROUND
A. Black - Ground
B. Tan - Coil 2
1. Black - Ground
2. Orange - 5V
3. Lt Blue - Signal
FPS
INJ6*
2. 12V
1. Signal
2. 12V
INJ5*
1. Signal
INJ8*
2. 12V
1. Signal
2. 12V
INJ7*
D. Org/Yel - Signal
1. Signal
2. Orange - 5V
3. White - Signal
OIL
CRANK
A. Pink - 12V
B. Orange - 5 V
C. Brown - Ground
Red - POWER Red - POWER
1. Black - Ground
4. Black - Gnd
5. Orange - Crank
6. Brown - Cam
7. Blue - Tsync
8. Gray - Shield
CAN
1. Green - CAN LO
2. Yellow - CAN HI
3. Blk/Red - Gnd
TPS Signal -
Blue
ALTERNATOR NOTE:
Both types of alterna-
tor connectors have
been provided to
accommodate the
different configurations.
Cut the one not used
and cap the wire with
the heatshrink provided
in the parts bag.
1. Orange - 5V
2. Black - Ground
3. Blue - Signal
TPS ADAPTER
A. Not Used
B. Brown - L Term
C. Not Used
D. Not Used
ALT
1. Brown-L Term
2. Not Used
ALT
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Figure 19 Wiring
DRIVER
SIDE
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