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I'm presuming this noise comes from the engine bay?

Loud ticking noises are a bad thing, particularly when they appear suddenly.

Typically, this could indicate a damaged lifter or worse, a damaged rod bearing. It could also be due to numerous other causes.

If I were you, I would not drive the car, with the possible exception of getting

it to your mechanic for an evaluation.

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Q: Why would your 2001 Pontiac sunfire make a strange loud ticking noise out of nowhere?
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If a Pontiac Sunfire is making a ticking sound is it due to not changing the oil?

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