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sprinkles08, ASE Certified Technician
Category: Saturn
Satisfied Customers: 22826
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Saturn ION: 2004 Saturn Ion with engine knock on top of intake?

Customer Question

2004 Saturn Ion with engine knock on top of intake? Do you know the history of the severity?
Submitted: 2 years ago.
Category: Saturn
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
A knocking noise in the intake is often caused by a valvetrain issue. The engine would most likely idle poorly if that's the case. An exhaust valve that isn't opening or an intake valve that isn't fully closing will cause compression to enter into the intake at every power stroke on the affected cylinder and cause a knocking noise in the intake. If the noise is accompanied by a rough idle, lack of power, etc then I would recommend removing the valve cover for an inspection of the valvetrain.