Lean Air/Fuel MixtureĪnother reason for detonation knock is having a lean air/fuel mixture. To resolve this, the timing must be fixed. When the timing is off, the spark won’t fire when it should, leading to multiple detonations within the cylinders. This timing is controlled by the computer. The timing refers to the point when the spark plugs fire. Poor TimingĪnother reason for the detonation knock is bad engine timing. RELATED: 6 Causes of a Knocking or Pinging Car Engine 3. This problem is an easy fix, just requiring you to use a higher octane fuel the next time you fill the car. High octane burns uniformly, thereby preventing that knock. If you have a performance engine, you need a higher octane rating than most cars. One such cause of this knock is octane that is too low for the engine. However, the detonation knock occurs when that mixture detonates in more than one place at a time, leading to a knocking noise. If the engine runs as it should, the air and fuel mixture is burning in a single detonation within each cylinder. Low OctaneĪ detonation knock can sound similar to a rod knock. The only way to repair this is to replace the bearings, which are deep within the engine. When the bearings are worn, the piston rods begin rattling against the crankshaft, creating a unique knocking sound. However, these bearings wear out over time and can come out of their position. The bearings are responsible for ensuring that the piston movement remains smooth and controlled. As the pistons move up and down in your car engine, they rotate the crankshaft, which is responsible for sending power to the wheels. The only cause of the rod knock is worn bearings. Here are some of the causes that could cause rod knock or have similar symptoms as rod knock: 1. Rod knock is only caused by one thing, but several other causes can lead to symptoms that are similar to rod knock. The most common cause of rod knock is worn connection rod bearings.
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