Throttle Body - Excessive Accelerator Pedal Effort

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 00-06-04-007A

Date: June, 2000

TECHNICAL

Subject:
Increased Accelerator Pedal Effort
(Replace Throttle Body)

Models:
1999-20O0 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) with 4.8 L, 5.3 L or 6.0 L V8 Engine (VINS V, T, U - RPOs LR4, LM7, LQ4)

This bulletin is being revised to add additional part numbers and clarify labor operations. Please discard Corporate Bulletin Number 00-06-04-007
(Section 06- Engine controls).

Condition
Some customers may comment on a higher than expected accelerator pedal effort from the idle position.

Cause
Condition may be caused by a tight throttle blade in the throttle body bore when in the closed position.

Correction

Notice
DO NOT adjust the shipping air screw to rotate the throttle body blade away from the throttle body bore. Adjusting the shipping air screw compromises the idle speed control, and may lead to other driveability concerns. Adjusting the shipping air screw may lead to reduced idle Air Control valve durability.

1. Verify the cause for this condition is not a damaged or binding throttle cable.





2. Remove the throttle body (3) from the engine and inspect the 4 digit Julian date code (2) stamped on the bottom edge of the mounting flange. The Julian date code is stamped on the lower edge of the mounting flange, next to the gasket edge,on the side of the throttle position sensor. The stamped 5 digit code (1) is the last 5 digits of the Throttle Body Assembly Part Number. See Figure 1 - Throttle Body Date Code Identification.

3. If the Date Code is 2979, or earlier:

^ Replace the Throttle Body Assembly using appropriate Service Manual procedure.
^ DO NOT clean the Throttle Body Assembly.
^ DO NOT attempt to adjust Throttle Assemblies.





Parts Information

Parts are currently available from GMSPO.

Warranty Information





For vehicles repaired under warranty, use the table.





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