Steering and vibration complaints are not always the result of improper alignment. One possible cause is wheel and tire imbalance.
Another possibility is tire lead due to worn or improperly manufactured tires. Lead/pull is defined as follows: At a constant highway speed on a typical straight road, lead/pull is the amount of effort required at the steering wheel to maintain the vehicle's straight path. Lead is the vehicle deviation from a straight path on a level road without pressure on the steering wheel.
Before performing any adjustment affecting wheel alignment, perform the following inspections and adjustments in order to ensure correct alignment readings:
Give consideration to excess loads, such as tool boxes, sample cases, etc. If normally carried in the vehicle, these items should remain in the vehicle during alignment adjustments. Give consideration also to the condition of the equipment being used for the alignment. Follow the equipment manufacturer's instructions.
Satisfactory vehicle operation may occur over a wide range of alignment settings. However, if the setting exceeds the service allowable specifications, correct the alignment to the service preferred specifications. Refer to Wheel Alignment Specifications Perform the following steps in order to measure the front and rear alignment angles:
Note:
Front Camber Adjustment
The front camber is not adjustable. If the front camber angle is not within specifications, inspect for suspension support misalignment or front suspension damage. Replace any damaged suspension components as necessary.
Front Caster and Camber Adjustment
The front caster and camber is not adjustable. If the front caster angle is not within specifications, inspect for suspension support misalignment or front suspension damage. Replace any damaged suspension components as necessary.
Wheel Alignment
Wheel Alignment - Steering Wheel Angle and/or Front Toe AdjustmentDriving Characteristics and Towing Tips
Driving with a Trailer
When towing a trailer:
• Become familiar with the state and local laws that apply specifically to trailer
towing.
• Do not tow a trailer during the first 800 km (500 mi), to prevent damage to the
engine, axle or other parts.
• Then, during the first 800 km (500 mi) tra ...
Buying New Tires
GM has developed and matched specific tires for the vehicle. The original equipment
tires installed were designed to meet General Motors Tire Performance Criteria Specification
(TPC Spec) system rating. When replacement tires are needed, GM strongly recommends
buying tires with the same TPC Sp ...
Engine Oil Life System
The engine oil life system calculates engine oil life based on vehicle use and
displays the CHANGE ENGINE OIL SOON DIC message or Code 82 DIC message when it is
necessary to change the engine oil and filter.
Remember, the Oil Life display must be reset after each oil change. It will not
reset ...