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Some customers may comment on an engine tick noise. The distinguishing characteristic of this condition is that it likely will have been present since new, and is typically noticed within the first 161-322 km (100-200 mi). The noise may often be diagnosed as a collapsed lifter . Additionally, the noise may be present at cold start and appear to diminish and then return as the engine warms to operating temperature. This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi). Cause The 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil. Correction Inspect the 0-ring seal and replace as necessary. Use the applicable part number listed below. Refer to the Engine Mechanical sub-section of the appropriate Service Manual.

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General Motors has decided that certain 2004 model year Chevrolet Malibu and Malibu Maxx vehicles may have been built with a steering column sensor that can wear unevenly and produce an erratic electrical signal. When the system software detects that erratic signal, power steering assist is lost. That signal is more likely to occur when the steering wheel is turned slowly. If this occurs, the driver will hear a chime, the Service Vehicle Soon light will illuminate, and the Driver Information Center will display “Power Steering.” Steering control is still maintained, although more effort is required at low speeds. The next time the vehicle is started, the power steering assist usually returns to normal and the lights in the instrument panel will be turned of{ but loss of assist can occur again until repairs are made.

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1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 3 in SIR. 2. Remove the upper and lower trim covers. Refer to Steering Column Trim Covers Replacement. IMPORTANT: The abrasion sleeve located on the steering column wire harness assembly must be reinstalled. Make note of what connector is coming out of the abrasion sleeve for installation purposes. 3. Remove the wire harness assembly (1) from the wire harness strap (2). 4. Disconnect the turn signal and multifunction switch assembly connector from the SIR system coil connector. 5. Slide the 2 connectors (2) of the turn signal and multifunction switch assembly out of the bulkhead connector (1). 6. Remove the 2 pan head tapping screws (1) and (3) from the turn signal and multifunction switch assembly (2). 7. Remove the turn signal and multifunction switch assembly (2) from the steering column tilt head assembly. Installation Procedure 1. Install the turn signal and multifunction switch assembly (2) onto the steering column tilt head assembly. NOTE: IMPORTANT: Be sure that the electrical contact of the turn signal and multifunction switch assembly (2) rests on the turn signal cancel cam assembly. 2. Screw the 2 pan head tapping screws (1) and (3) into the turn signal and multifunction assembly (2). Tighten Tighten the top pan head tapping screw (1) to 3 N.m (27 lb in). Tighten the side pan head tapping screw (3) to 7 N.m (62 lb in). Refer to Fastener Notice in Cautions and Notices.

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1. Remove the fuel sender assembly. Refer to Fuel Sender Assembly Replacement. 2. 3. 4. 5. 6. Disconnect the fuel pump electrical connector. Remove the retaining clip from the fuel level sensor connector. Disconnect the electrical connector from under the fuel sender cover. Remove the sensor retaining clip. Squeeze the locking tangs and remove the fuel level sensor (3). Installation Procedure 1. 2. 3. 4. Install the fuel level sensor (3). Install the sensor retaining clip. Connect the electrical connector to the fuel level sensor. Install the retaining clip to the fuel level sensor electrical connector. 5. Connect the fuel pump electrical connector. 6. Install the fuel sender assembly. Refer to Fuel Sender Assembly Replacement. FUEL SENDER ASSEMBLY REPLACEMENT Tools Required J 45722 Fuel Tank Sending Unit Wrench. See Special Tools. Removal Procedure 1. Remove the fuel tank. Refer to Fuel Tank Replacement (TrailBlazer EXT, Envoy XL, Envoy XUV) or Fuel Tank Replacement (TrailBlazer, Envoy, Rainier).

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Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2001 model year Chevrolet Silverado, Suburban; GMC Sierra and Yukon XL model vehicles, equipped with an 8.1L V8 (RPO L18 – VIN G) engine. Some of these vehicles have a condition in which the crankshaft position sensor can fail intermittently or permanently. If the sensor fails intermittently, the Service Engine Soon (SES) light may illuminate and the vehicle may run rough. In addition, the engine may stall, and if so, may re-start immediately or after a cool down period. If the sensor fails permanently, the engine will quit running and will not re-start.