How to Solve the Abnormal Noise in Crown Engine?
4 Answers
Crown engine abnormal noise solutions are: 1. Poor lubrication causes excessive wear of the piston and cylinder wall, leading to the clearance fit tolerance between the piston and cylinder wall exceeding the normal range, which results in engine abnormal noise. The solution is to replace the lubricating oil; 2. Excessive engine impurities can cause uneven engine operation, black smoke from the exhaust pipe, and the engine may be accompanied by a popping abnormal noise. The solution is to regularly clean internal engine blockages; 3. Aging or loosening of the engine mount can cause the engine to shake, thereby producing abnormal noise. The solution is to replace the engine mount; 4. If one or more cylinders of the engine are not working properly, the exhaust gas flow from the car will have obvious intermittency, and the exhaust pipe will shake severely. This phenomenon is closely related to the failure of the ignition coil. The solution is to have the ignition coil inspected and repaired at a workshop.
With decades of experience in car repair, I've encountered abnormal noises from Crown engines more than a dozen times. The most common issue is a loose timing chain, which produces a rattling sound, especially noticeable at idle. Prolonged neglect can lead to increased chain wear, risking tooth skipping and engine damage. Another frequent cause is a failed water pump bearing, creating a screeching noise. A simple check involves parking, opening the hood, and listening for sounds from the front. Oil level is also critical—low oil causes poor lubrication, resulting in a metallic grinding noise. Avoid DIY fixes; for instance, I've adjusted loose belts a few times, but chain issues require professional diagnostic tools. For safety, if the noise persists for more than a few days, promptly visit a reliable repair shop for a thorough inspection. Delaying can lead to higher repair costs. Regular maintenance, like frequent oil changes, can prevent such problems.
When I drove my Crown, the engine also made noises, those squeaky and rattling sounds were terrifying. After checking some information, it's likely due to belt aging or loosening, such as a faulty tensioner pulley bearing. You can just pop the hood and check if the belt has cracks or is loose. Worn engine mounts can also cause vibration and abnormal noises, especially when driving on bumpy roads. For more complex issues, plug in an OBD scanner to read the fault codes instead of guessing blindly. Later, I had it checked at the 4S shop, and it turned out to be a chain issue—replacing it made everything quiet again. My advice is not to skimp on maintenance; regular checks on belts and chains can significantly reduce the risk of abnormal noises, saving both hassle and money.
The engine noise is really annoying. My Crown had the same issue before. It could be due to low or dirty engine oil. Checking the dipstick is easy—just pull it out, wipe it clean, reinsert it, and check the oil level. Worn-out belts are also a common cause; inspect them for cracks. If you can replace them yourself, it saves trouble. However, if the chain makes a metallic knocking sound, that's a serious issue—take it to a repair shop immediately to avoid breaking down on the road. If the repair cost isn't too high, get it fixed; otherwise, driving won’t feel safe. I once ignored a small noise and ended up spending much more on major repairs. Regular maintenance, like changing the oil every 3,000–5,000 kilometers, helps prevent such problems.
