Possible Causes:
* Worn Hydraulic Lifters: This is the most likely culprit. Lifters wear out over time, especially if the engine oil hasn't been changed regularly or if the wrong type of oil was used. Worn lifters may not be able to maintain proper hydraulic pressure, leading to a ticking noise as they fail to properly compensate for the valve clearance.
* Low Oil Pressure: Insufficient oil pressure can also contribute to lifter noise. Make sure your oil pressure is within the acceptable range for your engine.
* Thick Oil: If you're using an oil that's too thick for your engine, it can create excessive friction in the lifter system, leading to ticking. Refer to your owner's manual for the recommended oil viscosity.
* Dirty Oil: Contaminated oil can clog the lifter passages, affecting their ability to function properly. Ensure regular oil changes with the correct oil filter.
* Valve Train Issues: While less common, problems with the camshaft, cam followers, or valve springs can also contribute to lifter ticking.
Troubleshooting Steps:
1. Check Oil Level and Pressure: Ensure you have the correct oil level and that the oil pressure is within the acceptable range.
2. Oil Change with the Correct Oil: Change the oil using the correct type and viscosity recommended for your 1994 Legacy 2.2 engine.
3. Inspect the Oil Filter: Make sure the oil filter is installed correctly and is not damaged.
4. Listen Carefully: Try to pinpoint the exact location of the ticking sound. Is it coming from a specific cylinder or a general area of the engine? This can help narrow down the potential problem.
5. Mechanic's Inspection: If the issue persists after addressing the basic steps, it's recommended to take your vehicle to a mechanic for a thorough inspection. They can use diagnostic tools to identify the root cause and advise on the necessary repairs.
Important Note: Ignoring excessive lifter ticking can lead to more serious engine damage, so it's essential to address the issue promptly.
