1. Safety First!
* Park the vehicle on a level surface, engage the parking brake firmly, and turn off the engine.
* Do not attempt any repairs while the engine is running.
2. Identifying the Cause:
The sticking could be due to several reasons:
* Debris or foreign objects: Something might be lodged under the pedal, preventing its smooth return.
* Worn or damaged pedal return spring: The spring responsible for returning the pedal to its resting position might be broken or weakened.
* Binding or sticky linkage: The mechanical linkage connecting the pedal to the throttle body could be seized or obstructed.
* Sticky throttle cable (if applicable): Older vehicles might use a cable; this could be sticking or frayed. The 2002 Blazer likely uses an electronic throttle control (ETC), but some cable-related issues are still possible.
* Electronic throttle control (ETC) issue (most likely): This is the most probable culprit in a newer vehicle. A malfunctioning ETC system could cause the pedal to stick or not return fully. This requires professional diagnostics.
3. Initial Troubleshooting:
* Visual Inspection: Carefully examine the gas pedal and its surrounding area. Look for any visible obstructions, debris, or damage to the pedal or linkage. Use a flashlight to get a good look.
* Manually Move the Pedal: Try gently moving the gas pedal up and down. Does it feel stiff or catch anywhere? Note any resistance points.
* Check the Pedal Return Spring: Locate the spring. If possible, visually check its integrity. It might be broken or detached.
* Lubrication (Use Caution): Do not spray lubricant directly onto the pedal or linkage. If you suspect a binding linkage, and ONLY if you are comfortable doing so, you might try carefully applying a small amount of *silicone-based lubricant* to the linkage pivots using a long-nosed applicator. This is a last resort before seeking professional help. Never use WD-40 or other petroleum-based lubricants, as they can attract dirt.
4. When to Call a Professional:
* If the problem persists after the initial inspection: Do not continue driving the vehicle.
* If you're uncomfortable working on the vehicle's mechanical or electronic systems: This is especially true regarding the ETC system.
* If you suspect an issue with the electronic throttle control (ETC): A faulty ETC system is a serious problem requiring professional diagnostics and repair. This system uses sensors and computer control and is not something to troubleshoot on your own.
5. Professional Repair:
A qualified mechanic will have the tools and expertise to diagnose the problem accurately. They can inspect the entire system, including the pedal, linkage, throttle body, and ETC system, to identify the exact cause of the sticking pedal and perform the necessary repairs or replacements.
In summary: A sticking gas pedal is a serious safety issue. While a simple obstruction might be easily fixed, a deeper mechanical or electronic problem needs professional attention. Don't risk your safety or the safety of others—call a mechanic immediately.
