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Knocking is caused by preignition, where the heat in the cylinder causes the gas to ignite before the spark plug does. The noise could also be piston slap, which is caused by a worn cylinder wall. Try using a higher octane/grade gas and see if the noise goes away.
In certain engines like the Malibu 3.1 liter and others, the knocking is caused by a piston rocking in the cylinder. This is called piston slap. It is a damaging condition, but seems to be considered "normal" by GM.
What else can I help you with?
What would cause a loud knocking noise coming from the engine at 70 mph and make the truck shake very badly?
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
There is a knocking noise in the motor of my 1992 town and country. Could this be the transmission going?
NO. A knocking noise in the engine is a problem in the engine.
What could be causing a knocking noise when coasting in my vehicle?
A knocking noise when coasting in a vehicle could be caused by issues with the engine, transmission, suspension, or brakes. It is important to have a mechanic inspect the vehicle to determine the exact cause of the noise.
What does it mean when your engine has a knocking noise?
When your engine has a knocking noise, it could mean that a rod has been thrown. It could also mean you are low on oil.
Can a bad harmonic balancer make a knocking noise?
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
Knocking in the bottom of the engine?
knocking noise
What cause the engine to have a knocking noise on 3.0 liter Toyota Avalon?
Crank Shaft.
What causes a knocking noise under the hood of your car?
it could be your valves or your engine
What would cause a knocking sound when not stepping on the gas?
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
What would cause a loud knocking noise in engine upon starting?
Running too lean.
What would cause a Knocking noise 4.3 ltr?
The thing that could cause a knocking noise in your car is the same thing that could cause it in all cars A rod that or a flat lifter. it all really depends on where the knock is if its higher and to the back of the motor, it could be a motor mount
The engine is making a knocking noise what could it be?
Depends on the sound of the knock. Could be main bearings or rod bearings.
