Edelbrock 3988 User Manual

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

©2008 Edelbrock Corporation

Brochure #63-0356

Page 1 of 2

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).

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.)

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.)

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

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

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

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

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

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

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

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

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

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.