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What that knocking sound in your engine really means

Engine knock is not a single problem — there are at least four distinct types, each with a different cause and a different level of urgency. The pinging sound that appears only under hard acceleration ...
Jalopnik

What Causes Engine Knocking (And How Can You Prevent It)

Engine knock is the sharp, metallic sound that cuts through the hum of a healthy engine. At its core, engine knock is a problem of timing. In a knocking engine, parts of the air-fuel mixture don't ...
Ars Technica

Subwoofer making a constant knocking sound when not in use

I've got a 6 year old JBL 10" subwoofer (home theater sub, not a sub for a car) that has suddenly taken to making a constant rhythmic knocking sound, even when not in use by the receiver. The sound is ...
The Daily Dot

‘Sounds like a brand new GM truck engine’: Mechanic reveals the engine noise you never want to hear—especially in a Hyundai or Kia. Then he reveals what you can do about it

If your Kia or Hyundai engine just started making a loud knocking sound, don’t panic. You might be eligible for a free engine replacement due to a massive engine recall. Featured Video A viral TikTok ...