Edelbrock 39633, 3862, 39793, 38793, 3879 User Manual

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Catalog #3862, 3863, 3878, 3879, 3888, 3962, 3963, 3978, 3979, 3988, 38633, 38783, 38793, 38883, 39623, 39633, 39783, 39793, 39883 Rev. 4/08 - AJ/mc

Brochure #63-0356

Page 1 of 2

UNIVERSAL FOUR-BARREL THROTTLE BODIES

Catalog #s: 3862, 3863, 3878, 3879, 3888, 3962, 3963, 3978, 3979, 3988,

38633, 38783, 38793, 38883, 39623, 39633, 39783, 39793, 39883

INSTALLATION INSTRUCTIONS

PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and

procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this installation, it is recommended to have the installation completed by a qualified mechanic. If you have any questions or problems, please call our

Technical Hotline at: 1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at edelbrock@edelbrock.com

• DESCRIPTION: These progressive linkage, 4-barrel throttle bodies are designed for use with most aftermarket electronic fuel injection systems. They bolt directly to standard square-bore or 4500 series carburetor mounting flanges and feature a Delphi/GM IAC motor (Stepper Type) or a Hitachi Linear IAC motor (Pulse Width Modulated Type) (See “APPLICATIONS” below).

APPLICATIONS:

Catalog #3862, 3863, 3878, 3879, 3888, 3962, 3963, 3978, 3979 & 3988

These throttle bodies are designed to work with a Delphi/GM IAC (Stepper Type)

(See Figure 1)

. Refer to instructions provided with the ECU being

used or contact the manufacturer of your ECU for pin locations and signal output. The Throttle Position Sensor (TPS)

(See Figure 3)

mates with a GM style connector (Packard Metripack part # 12065287 or 12052895). Refer to the instructions provided with the ECU being used or contact the manufacturer of your ECU for pin locations and signal output.

1. Install throttle body on intake manifold using standard carburetor mounting hardware and the supplied gasket.

2. Connect IAC motor and TPS sensor to the appropriate connectors on your wiring harness.

3. Throttle cable mounting may vary, so a throttle cable bracket may need to be fabricated. Throttle cable and bracket are not included.

(For Chevrolet applications, Edelbrock offers a variety of universal throttle brackets, see catalog or website for details.)

Catalog #38623, 38633, 38783, 38793, 38883, 39623, 39633, 39783, 39793 & 39883

These throttle bodies are designed to work with a Hitachi Linear IAC motor (Pulse Width Modulated Type)

(See Figure 2)

. Refer to instructions

provided with the ECU being used or contact the manufacturer of your ECU for pin locations and signal output. The Throttle Position Sensor (TPS)

(See Figure 3)

mates with a GM style connector (Packard Metripack part # 12065287 or 12052895). Refer to the instructions provided with the

ECU being used or contact the manufacturer of your ECU for pin locations and signal output.

1. Install throttle body on intake manifold using standard carburetor mounting hardware and the supplied gasket.

2. Connect IAC motor and TPS sensor to the appropriate connectors on your wiring harness.

3. Throttle cable mounting may vary, so a throttle cable bracket may need to be fabricated. Throttle cable and bracket are not included.

(For Chevrolet applications, Edelbrock offers a variety of universal throttle brackets, see catalog or website for details.)

INSTALLATION

THROTTLE BODY DESCRIPTION

3862, 3692 1600 cfm (2.00” throttle bores) for 4500 series carb mounting flange which uses but does not include Delphi/GM IAC

3863, 3963 2000 cfm (2.25” throttle bores) for 4500 series carb mounting flange which uses but does not include Delphi/GM IAC

3878, 3978 1000 cfm (1.75” throttle bores) for standard, square-bore carb mounting flange with Delphi/GM IAC

3879, 3979 1600 cfm (2.00” throttle bores) for 4500 series carb mounting flange with Delphi/GM IAC

3888*, 3988* 2000 cfm (2.25” throttle bores) for 4500 series carb mounting flange with Delphi/GM IAC

38623, 39623 1600 cfm (2.00” throttle bores) for 4500 series carb mounting flange which uses but does not include Hitachi IAC

38633, 39633 2000 cfm (2.25” throttle bores) for 4500 series carb mounting flange which uses but does not include Hitachi IAC

38783, 39783 1000 cfm (1.75” throttle bores) for standard, square-bore carb mounting flange with Hitachi IAC

38793, 39793 1600 cfm (2.00” throttle bores) for 4500 series carb mounting flange with Hitachi IAC

38883*, 39883* 2000 cfm (2.25” throttle bores) for 4500 series carb mounting flange with Hitachi IAC

NOTE: It may be necessary to plenum match the carb flange of the intake manifold to eliminate a positive step created by the oversized

bores of the #3888, 3988, 38883 & 39883 throttle bodies.

Catalog #3862, 3863, 3878, 3879, 3888, 3962, 3963, 3978, 3979, 3988, 38633, 38783, 38793, 38883, 39623, 39633, 39783, 39793, 39883 Rev. 4/08 - AJ/mc

Brochure #63-0356

Page 2 of 2

Figure 2 - Hitachi Linear IAC Motor (Pulse Width Modulated)

• IAC motor wiring is shown below, compare this information to the instructions provided with the ECU being used, or contact

the ECU manufacturer with this information to determine proper wiring.

Edelbrock Corporation • 2700 California St. • Torrance, CA 90503

Tech Line: 800-416-8628 • E-Mail: Edelbrock@Edelbrock.com

Stepper Coil “A” - High

Stepper Coil “A” - Low

Stepper Coil “B” - Low

Stepper Coil “B” - High

Signal In (PWM Input)

12 Volts In

Figure 1 - GM/Delphi IAC Motor (Stepper Type)

• IAC motor wiring is shown below, compare this information to the instructions provided with the ECU being used, or contact

the ECU manufacturer with this information to determine proper wiring.

Figure 3 - Throttle Position Sensor (TPS)

• TPS wiring is shown below, compare this information to the instructions provided with the ECU being used, or contact the ECU

manufacturer with this information to determine proper wiring.

NOTE: Throttle bodies are intended for use in applications in which they will be integrated into a custom fuel injection system. Therefore, due to

varying applications and custom use of these throttle bodies, these instructions are intended only as a guide. You should be familiar with the setup and wiring of a custom fuel injection system. Wiring diagrams have been provided for information purposes only.

CIRCUIT SCHEMATIC

B ( - )

5K OHMS

± 40%

SPRING

RETURN

OUTPU

A ( + )