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It all depends on what KIND of knocking sound.
Some people call it a knocking sound when the engine pings from pre-ignition. If that's what you have, check the knock sensor.
A classic knocking sound is typically either worn bearings or piston slap.
- Piston slap is when there the skirt of the piston is a little small and it "pops" at the bottom of the stroke. Typically that sound goes away once the engine warms up. The small block 350 is notorious for a little piston slap and as long as it goes away once the engine is warmed up piston slap is considered to be in the nuisance category of engine sounds.
- If it's worn bearings you'll also see some kind of indication of low oil pressure. If THAT'S going on, the engine is "done". You can try a heavier weight oil but if it's knocking constantly that probably won't do much good.
Thank You for that Answer about the Bearings and Crankshaft
What else can I help you with?
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Sounds like an exhaust leak.
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That doesn't sound right. Maybe try a different gage.
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Engine rod? Engine bearing?
What does your car shake and a knocking sound coming from under the bonnet?
A other small child
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Sounds like your lifters are bad and might need ajusted or changed, it could be your cam not looping.
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5500 RPM or 5 RPM below the banging knocking sound you just had .
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if the engine is knocking really loud you probably need to overhaul the entire engine or get a new or used engine because loud knocking is not good
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A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
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This is most lilkely the sound of one of the piston connecting rods trying to get out of the engine block. Give it some time and it will exit the block of its own accord. Seriously, get your car checked by a professional.
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light slapping knock is a piston knock a loud heavy repetitive knock is a connecting rod Very Bad
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check for exhaust leaks around the manifold inlets and outlets.
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The ac compressor is shot. Usually what your hearing is a bearing that is moving around.
