Possible Causes of Engine Shakes:
* Spark Plugs: Worn or fouled spark plugs can cause misfires, leading to engine shaking.
* Ignition Wires: Damaged or worn ignition wires can prevent proper spark delivery, resulting in misfires.
* Fuel Injectors: Clogged or faulty fuel injectors can lead to uneven fuel delivery, causing engine roughness.
* Air Intake System: Leaks in the air intake system can create a lean air/fuel mixture, causing engine instability.
* Engine Mounts: Worn or damaged engine mounts can allow the engine to move excessively, resulting in shaking.
* Valve Timing: Incorrect valve timing can cause engine misfires and uneven running.
* Compression: Low compression in one or more cylinders can lead to uneven power delivery and shaking.
* Vacuum Leaks: Leaks in the vacuum system can affect engine performance and cause shaking.
Steps to Diagnose and Fix the Problem:
1. Inspect Spark Plugs and Wires: Check the spark plugs for wear, fouling, or gaps that are out of specification. Inspect the ignition wires for cracks, damage, or loose connections. Replace any faulty components.
2. Inspect Fuel Injectors: You might need a professional to diagnose fuel injector issues. Cleaning or replacing faulty injectors can resolve fuel delivery problems.
3. Check Air Intake System: Inspect the air filter, air intake hose, and throttle body for leaks or obstructions.
4. Examine Engine Mounts: Check the engine mounts for cracks, tears, or excessive movement. Replace any damaged mounts.
5. Verify Valve Timing: If you suspect valve timing issues, consult a mechanic for proper diagnosis and adjustment.
6. Perform a Compression Test: A compression test can help determine if there are any issues with cylinder compression.
7. Inspect for Vacuum Leaks: Inspect all vacuum lines and hoses for leaks. You can use a vacuum gauge to test for leaks.
Important Notes:
* Safety First: Always follow safety precautions when working on your vehicle. Disconnect the battery before working on electrical components.
* Professional Help: If you're not comfortable diagnosing and repairing the problem yourself, consult a qualified mechanic.
* Troubleshooting Tools: Having a basic set of tools, including a multimeter and a vacuum gauge, can be helpful for troubleshooting engine problems.
* Vehicle-Specific Information: Consult your vehicle's owner's manual for specific information on engine maintenance and troubleshooting.
By following these steps and working with a professional if needed, you can hopefully identify and resolve the issue causing your 2002 Mitsubishi Lancer Rally OZ engine to shake. Good luck!
