* Hydraulic lifters (or tappets): These are common culprits. If they're worn, sticking, or low on oil pressure (even if the overall oil level is fine), they'll create a ticking noise. This is often more pronounced when the engine is cold and can lessen as it warms up.
* Exhaust leak: A leak in the exhaust manifold or pipes can cause a ticking or clicking sound, especially when the engine is under load.
* Valvetrain issues: Problems with the rocker arms, pushrods (if equipped), or even a slightly bent valve could cause ticking.
* Timing chain or belt: A worn or loose timing chain (more likely in a 1993 Probe) or belt can produce a ticking or rattling sound. This is a serious issue and should be addressed immediately.
* Loose heat shields: These metal shields protect components from heat. If loose, they can vibrate and create a ticking noise.
* Spark plug issues: Although less common to produce a *consistent* ticking, a loose spark plug or a damaged insulator could potentially contribute to a clicking sound.
* Something external: A small stone or debris trapped near the engine could also be causing the sound.
Troubleshooting Steps:
1. Listen carefully: Try to pinpoint the location of the ticking. Is it consistent, or does it change with engine speed or load? This will give you clues.
2. Check the oil pressure: Even if the oil level is okay, low oil pressure can still cause lifter tick. A pressure gauge is the best way to check.
3. Inspect visually: Look for anything obvious – loose heat shields, damaged components, etc.
4. Consult a mechanic: If you're not comfortable diagnosing this yourself, taking your Probe to a qualified mechanic is advisable. They have the tools and expertise to diagnose the problem accurately and safely.
Ignoring a ticking sound could lead to more serious engine damage. Addressing it promptly is important.
