Impala V6-3.8L VIN K (2004)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls/Fuel - Clunk/Bang From Vehicle Rear
Bulletin No.: 04-06-04-066B
Date: September 02, 2005
TECHNICAL
Subject:
Clunk/Bang From Rear of Vehicle (Replace Fuel Tank and Reflash PCM)
Models:
2003-2004 Buick Century, Regal
2003-2004 Chevrolet Impala, Monte Carlo
2004 Pontiac Grand Prix
Supercede:
This bulletin is being revised to remove the 2003 Grand Prix from the models. Please discard Corporate Bulletin Number 04-06-04-066A (Section 06 -
Engine/Propulsion System).
Condition
Some customers may comment on a clunk/bang type noise coming from the rear of the vehicle. This noise will be most noticeable when the vehicle
comes to a stop or during parking lot maneuvers. Customers may also comment that the noise occurs when the fuel tank is between 1/2 and full.
Cause
The noise may be caused by fuel sloshing around in the fuel tank.
Correction
Replace the fuel tank with P/N 15141578. Refer to the Fuel Tank Replacement procedure in the Engine Controls sub-section of the service manual. This
new tank has internal baffles to prevent the fuel from sloshing around.
Important:
This new fuel tank also requires the PCM to be reflashed with a new service calibration due to revised evaporative characteristics. This new
calibration is currently available through TIS2000. As always, make sure your Tech 2(R) is updated with the latest software version. You will need to
call Techline(R) Customer Support Center (TCSC). TCSC will provide a VCI number to allow the vehicle to be updated with the proper calibration.
Parts Information
Warranty Information
