What Causes the Oil Noise Momentarily When Starting a CRV?
2 Answers
Below are the specific reasons for the momentary oil noise when starting a CRV: Engine Knock: This is a sound similar to metal knocking, also known as piston slap. The causes can be divided into three categories: substandard fuel, such as using low-quality fuel or fuel with an octane rating that is too low; incorrect engine timing control, such as an excessively advanced ignition timing, which requires readjustment; and excessive carbon buildup inside the engine. Valve Noise: After starting, the engine makes a "ticking" sound, which is the sound of the valves. This is especially noticeable when starting a cold engine, as the oil pressure has not yet built up and the valves are not properly lubricated. The noise will naturally subside after a short while. Engine "Backfire" Issue: When decelerating and releasing the throttle, a "popping" sound may occur, which could indicate an engine "backfire" issue, commonly referred to as engine "backfiring." Excessive carbon buildup on the valves or incorrect valve timing can cause this noise. Cleaning the valve carbon deposits or adjusting the valve timing may resolve the issue. Engine Misfire: If one cylinder is not functioning, the engine will become unbalanced and produce noise, often accompanied by severe engine vibration and power loss. Possible causes include faults in the ignition module, spark plugs, or fuel injectors. Replacing the corresponding components should fix the issue.
Speaking of the CRV making an oil-related noise at startup, I've seen too many cases in my over ten years at the repair shop. It's mainly caused by the oil pump or hydraulic lifters. When starting up, the oil pressure doesn't build up immediately, and the lifters aren't filled with oil, resulting in an annoying clattering sound. Check the oil dipstick right away to see if the oil level is sufficient. If the oil is dark like old soy sauce, it's deteriorated and needs to be replaced. A clogged oil filter can also cause trouble—I've encountered several CRVs with this issue. Delaying repairs can lead to serious engine wear and damage. Get it fixed properly at a reputable repair shop as soon as possible; spending a few hundred bucks now can save you from major expenses later. Change the oil more frequently and don't skimp by using low-quality oil.
