2009 nissan altima engine knock

Asked by 09altimaguy Jul 24, 2019 at 09:14 AM about the 2009 Nissan Altima 2.5 S

Question type: Maintenance & Repair

2.5l nissan engine makes a knocking sound, that
goes away when the engine is at proper operating
temp and whilst normal driving.

What could it be? I changed spark plugs and oil.
Noise is slightly less noticeable. Maybe a hole in
the cat/ manifold?

2 Answers
1,115

GuruHBY1Q answered 5 years ago

Is the check engine light on? Could be a few different things. Try cleaning Mass Air Flow sensor and check the upstream O2.

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