Question about Cars & Trucks
Interesting. There are several things which can make that sound. Oddly enough, some Automakers use pellets in the Catalytic converter and when they lose the partitions inside the converter they tend to rattle like that. Another related area is the shields on the Catalytic converters. Sometimes the welds break and the shields flap against the pipes. Third, if you travel gravel roads the stones kick up get inside the shields and rattle.
Moving forward you have the A/C clutch bearings which can make that sound before they altogether cut loose.
Transmission Torque converters on automatics make that sound very close to failing. As long as the engine is running it does not have to be i gear.
But an individual valve in an engine will not make that sound. A broken sparkplug tip could make a noise but you would have a missfire.
There are roller bearing pulleys on the pulley system for the Serpetine belt. Any of these devices could make noise. Besides the A/C compressor, your Alternator and even your Power steering pump can
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Posted on Jan 16, 2013
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Posted on Jan 02, 2017
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