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Ticking and check engine light

Old 10-13-2018, 09:00 PM
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Default Ticking and check engine light

Hey guys, I'm hoping someone can help me diagnose these symptoms. 2008 F150 4.2L V6 with 175k miles

Just started out of the blue a few days ago. Check engine light came on with code: P2004 (intake manifold runner control stuck open - bank 1)
At the same time I started hearing a ticking noise. This noise only occurs when accelerating over 20-30mph at higher RPMs. In neutral, I don't hear anything unusual when revving it up, which makes this difficult to pinpoint where it's coming from. The frequency almost seems constant but the pitch can vary quite a bit, typically louder with higher RPMs under load.

Could the noise I hear be coming from the actuator or flaps in the upper manifold? Or maybe engine knock caused by the flaps being stuck open?

I'm more worried about the noise than I am with replacing the IMRC..


To my knowledge, the valves have never been adjusted either.
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