How does a car act when spark plugs are bad?

Rough idling
2. Uneven power when accelerating
3. An increase in exhaust emissions

These are all symptoms of misfiring spark plugs.

What does a car sound like when spark plugs are bad?

Your engine should sound smooth and steady when your spark plugs are performing correctly.
2. If your spark plugs are fouled, your engine will sound rough while idling.
3. You might also feel the vehicle vibrating if your spark plugs are fouled.

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What does a car sound like when it needs new spark plugs?

Engine Knocking

If you hear a knocking sound coming from your engine, it could be due to the spark plugs not igniting all the fuel properly. When this happens, the unburned fuel and vapor can catch fire and cause a detonation.

When I press the gas I hear a rattling noise?

Some experts call the rattling noise “carbon rap.” It’s caused by worn or sticking valves and hydraulic lifters. Carbon rap is caused by premature ignition of the air and fuel mixture inside the motor. It can also be caused by dirty oil and using the improper fuel octane required for your vehicle.

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2. The rattling noise that some experts call “carbon rap” is caused by worn or sticking valves and hydraulic lifters. Carbon rap occurs when the air and fuel mixture inside the motor ignites prematurely. It can also be caused by dirty oil and using the improper fuel octane required for your vehicle.

3. The rattling noise referred to by some experts as “carbon rap” is actually caused by worn or sticking valves and hydraulic lifters. When the air and fuel mixture inside the motor ignites prematurely, it causes carbon rap. Additionally, carbon rap can be caused by dirty oil and using the improper fuel octane required for your vehicle.

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Why does my car make a rattling noise when I hit the gas?

Detonation, Pre-ignition (Pinging) Noise: 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.

2.If you hear a pinging or rattling sound coming from your engine, it may be due to pre-ignition. This is when the air/fuel mixture in the cylinder is ignited prematurely by the heat of compression as the piston is moving up on the compression stroke.