Chevrolet LT1 Manual Del Usuario página 2


Ensure Fuel Pump Power Module, if used, is installed properly.

Once the engine is warmed up. oil pressure step changes of 10 psi or more may be seen without any RPM change. This is a normal operating
condition used for diagnostic purposes.
Don't:

Change or alter any wiring in the accelerator pedal or electronic throttle systems.

Vacuum reference the fuel system.

Solder or alter any Oxygen Sensor wiring.
Vehicle Speed Input
The ECM is programmed and looking for 40 pulses per revolution typical for automatic transmissions. The LT1 Control System harness is designed to
plug into the output speed sensor of 4LXX Transmissions or the T56 Super Magnum manual transmission, which have a 40 pulse output. The ECM
MUST have the VSS plugged in. If the ECM does not see the VSS, throttle will be limited to 30% to protect the engine from over speed. For 8 speed
automatic transmissions, the vehicle speed information is fed to the transmission controller over the CAN lines. The Vehicle Speed Sensor connector is
not used.
Axle Ratio and Tire Size Requirements
The axle drive ratio in the calibration is set to 3.42:1 and is suitable for ratio from 3.08 to 4.11. Tire diameter needs to be between 26" and 30".
NOTE: For optimal performance choose an axle ratio and a tire size with-in the recommended range.
NOTE: All engines are shipped without a flex plate or flywheel. All engines are shipped without a starter. For automatic transmission applications, the
flexplate and torque converter must be purchased separately. For manual transmission applications, the flywheel and clutch assembly must be
purchased separately, See www.chevroletperformance.com
NOTE: The parts listed here may have been updated or superseded, go to
Parts List:
These instructions cover the following packages:

19418585 LT1 Control kit for 4L & T56 trans with 4 Pin High Pressure Fuel Sensor

19418587 LT1 Control kit for 4L & T56 trans with 3 Pin High Pressure Fuel Sensor

19418589 LT1 Control kit for 8 Speed trans with 3 Pin High Pressure Fuel Sensor

19418591 LT376-535 Control kit for 4L & T56 trans with 3 Pin High Pressure Fuel Sensor
All engine control kits have the following parts:
19418601
12677010
19303138
23262344
19166574
19300176
19300177
10379038
12655677
15156588
13516496
23382215
11588564
11562004
22942442
One of the following engine control modules
19418588
19418590
19418592
19418586
LT1 Based Engine Control System
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
03MY19
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
Vehicle Requirements
for recommended Chevy Performance installation kits and starters.
I-Sheet (Instruction Sheet)
LT1 Engine Harness for 3 pin or
LT1 Engine Harness for 4 pin
Mass Airflow Sensor
Mass Airflow Sensor Bracket
MAF Bolt/Screw - Qty 2
MAF Washer - Qty 2
Accelerator Pedal
Oxygen Sensor - Qty 2
Oxygen Sensor mounting boss - Qty 2
Fuel Line Pressure Sensor
Fuel Pump Power Module
Bolt/Screw - Qty 2 - M8x1.25x25
Bolt/Screw - Qty 2 - M8x1.25x30
Emblem
LT1 Controller 4L/T56 with 3 Pin
LT1 Controller 8 speed with 3 Pin
LT376-535 Controller 4L/T56 with 3 Pin
LT1 Controller 4L/T56 with 4 Pin
Revision
Init Rel – Blake Nye
www.chevroletperformance.com
PART No.
IR 03MY19
19418601
Auth DR
Title
NA
LT1 Based Engine Control System
PART No.
for the latest part number list.
SHEET
Installation Instructions
19418601
2 of 33
SHEET 2 of 33