SOURCE: loud rattling noise coming from front of the engine by harmonic
Sounds like a bad water pump or a tensioning pulley.
SOURCE: Real loud knocking noise when starting
this can be a serious problem, sounds like one of your engine valves, has the car overheated recently? if your valves bent, you need to take the engine apart hope i helped
SOURCE: Loud engine knocking on 2001 Ford Focus
Sounds to me like a very common problem has occured to your neighbor. If this is a SOHC engine, one of the valve seats in the number 4 cylinder has fallen out. I'm sure it has damaged the head and the piston. Stop trying to run it or you might blow a hole in the cylinder wall or break a rod or both.
SOURCE: 2004 Hyundai Getz Noise in front
had same problem,believe it or not it was only a loose clamp on my cat- converter. jack her up and see hopefully same prob
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