The rattle/knocking noise when using too low octane fuel, incorrect timing or bad tuning etc is called ‘knock’ also known as detonation and this is where the fuel/air mixture is ignited when it isn’t supposed to / at a different time to when the spark plug is fired.
What happens if you put the wrong octane level in your car?
Hint – it’s not. Typically, although there are some variations among engines, putting a higher-octane gas into your car than it requires will neither help nor hurt your car’s performance. There are some engines that are not designed to burn higher-octane fuel and you may see a reduction in power and fuel economy.
What causes rattling sound in engine?
You usually hear this noise when accelerating the vehicle. Most people call this a pinging or rattling sound. This noise is caused by an air/fuel mixture in the engine cylinder being ignited prematurely by the heat of compression as the piston is moving up on the compression stroke.
What would cause a rattling noise when you accelerate?
Worn out belt pulleys
Worn out or broken belt pulleys might be the culprits if there is a constant rattling sound as you accelerate the vehicle. The pulleys will spin faster as the engine speed increases. Damaged pulleys will also cause engine noises even at idling speed!
When I press on the gas I hear a rattling noise?
Often around the gas tank, muffler, exhaust piping, and exhaust manifold. This not only leaves them exposed to debris but moisture as well, which means they will likely develop problems with rust. You guessed it – if the damage is severe enough, it can cause your car to make a rattling sound when accelerating.
What does a rattling timing chain sound like?
Timing chain noise is commonly most noticeable during cold startup of the vehicle when oil pressure and oil flow is at its lowest. Excess slack in the timing chain can cause a rattling sound or even a clanking sound if the slack is severe enough to cause the chain to contact the timing chain cover.
How do I fix a rattling noise in my engine?
You can hear it rattling. And of course we'll check all the other bearings to make sure they're not making any noise. And here's why you check all the bearings because the alternator bearings is also.
What is the most likely cause of a rattling sound coming from the underside of a vehicle?
If the rattling sound sounds like it is coming from underneath your vehicle, you likely are experiencing a problem with your exhaust system. Exhaust system problems include catalytic converter problems, muffler issues or corroded pipe, can sound like light rattling to rocks shaking beneath your car.
What does engine rattle mean?
If you hear a pinging or a engine rattling noise when accelerating, low-octane fuel could be the cause. Pinging (also called pre-ignition or detonation) can also be the result of carbon deposits; a bad knock sensor, overheating or incorrect ignition timing. Pinging From Low-Octane Fuel.
Can bad spark plugs cause rattle?
Older cars with high mileage may have faulty spark plugs due to corrosion. This can result in a rattling noise which you’ll notice as your drive and accelerate.
What are signs of a bad ignition coil?
What Are the Signs of a Faulty Ignition Coil?
- Loss of Power. This is one of the first symptoms of ignition coil failure. …
- Check Engine Light On. …
- Poor Fuel Economy. …
- Backfiring. …
- Misfiring Engine. …
- Hard Starts and Stalling. …
- Spluttering and Coughing Sounds. …
- Jerking and Vibrating.
What does a bad ignition coil sound like?
If your engine misfires or stalls when you are idle or when you stop suddenly or accelerate, there could be a problem with your ignition coil. A misfire — which can sound like a coughing or sputtering noise or feel like a jerk or strong vibration — means that one of the engine’s cylinders is not firing correctly.