Can the cold make your engine knock?
A cold piston knock for up to a minute and a half after starting a cold engine may be normal. This may be due to increased clearance between the pistons and cylinders. But once the engine warms up, the knocking noise should disappear. If it doesn’t something bigger could be at play.
Why does my car knock when I first start it?
If you start up your car and hear knocking noises, this usually means the fuel of the car was not ignited properly. This could be due to low-quality fuel, bad spark plugs, or another reason above. The first step is to use better quality fuel.
Can I drive if my engine is knocking?
Engine knocking is nothing to ignore. When the gasoline in your engine burns unevenly, it creates a kind of “POP” shock-wave that makes the knocking sound. Run your car for very long with this kind of problem, and it can cause serious engine damage.
How long does engine knocking on cold start last?
Lasts maybe 30 seconds after cold start (haven’t tried warm start to know for sure). It is louder on the bottom of the engine compared to the top. Attached audio (from under engine) as requested. I would suggest that you start using 10w30 in the future.
Why does my engine knock when I start my car?
If the knock totally disappears when the engine is fully warmed up piston slap is a likely cause and rod knock is considerably less likely. And that is usually a much better situation, @Samsus. I drained some of the oil. Knocking is still present but much quieter.
What should you do if your car is knocking on cold start?
Smell the dipstick. If it has the odor of gasoline it would be advisable to not start the engine until it has been drained and refilled with the proper oil and the source of the contamination found and repaired.
Why does my car rattle on cold start?
If you hear engine rattle noise from your engine on cold start, and the engine rattle noise goes away after a few seconds, and the engine rattle noise comes from the side of the timing cover we will explain what could cause that. Most new engines nowadays are equipped with timing chain.