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That depends if it is a load tapping sound if so, it might be your valves tapping, and you might just be about ready for a rebuild. If it sounds a lot louder and more metallic like a banging sound, your engine may have thrown a rod, and for sure needs to be rebuilt or replaced. You also might consider trying a higher grade of octane that you are using in your gas tank to see if the noise doesn't clear up on its own. sometimes engines will need a higher octane for a tank or two to clean out the gunk build up in the engine. Best of luck to you!
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There are a number of reasons why an engine would knock when you idle the vehicle. It could be your motor mounts. You may also need oil.
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I've had this same problem and if it makes a rattling sound it sounds like its the catillitic converter.
