Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body) (04-06-04-040)

Publication date: 2004-06-14
Reference number: 04-06-04-040

Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 04-06-04-040, Date of Issue: June 14, 2004

Affected Model(s):

2002-2003 Cadillac Escalade, Escalade EXT; 2000-2003 Chevrolet Silverado, Suburban, Tahoe; 2002-2003 Chevrolet Avalanche; 2000-2003 GMC Sierra, Yukon, Yukon XL; 2003 Hummer H2; with 4.8L, 5.3L or 6.0L V8 Engine (VINs V, T, Z, N, U - RPOs LR4, LM7, L59, LQ9, LQ4); and Electronic Throttle Control

Condition

Some owners may comment on an idle instability, low idle speed or rough idle.

Cause

Condition may be caused by deposits in the throttle body bore.

Correction

Clean throttle body bore and throttle valve plate of carbon using a shop rag and an appropriate cleaner. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure. This procedure may be performed at any mileage necessary. Check to determine if the PCM calibration has been previously updated to one that includes the update for throttle body coking. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration.

Warranty Information

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time
J5480	Throttle Body - Clean and Adjust	0.2 hr
Add:	To Reprogram PCM	0.4 hr