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Old 09-15-2019, 09:10 PM   #1
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Question about the Diverter in intake plenum

Hey y'all:
I'm getting ready to trouble shoot a minor problem on this new/used 3.2 I just installed in my '03 S. I could use a crash course on a couple items.

I've only got about 200 miles in the car since the motor was installed. It's a 3.2 from an '04 with 86k on it. It's popping a code that suggests vacuum leak (I think it was P0440?). The symptom I'm FEELING though, seems more specific. When accelerating, especially at full throttle, it feels like there's a flat spot where power falls off around 4000rpm or so.

I'd like to understand the "flap" that's in the intake crossover plenum, which is vacuum controlled. What's the intended operation there? I assume it opens under certain vacuum conditions, and allows more volume for cylinder fill? Is it possible this is my culprit?

TIA

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Old 09-15-2019, 10:09 PM   #2
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It’s a resonance flap. It’s purpose is to eliminate intake resonance between the two banks for smoother airflow at higher RPMs, similar to an exhaust crossover pipe.

I’ve read that it can cause a flat spot at around 5k if not operating properly, but no personal experience.
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Old 09-15-2019, 11:03 PM   #3
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Quote:
Originally Posted by particlewave View Post
Itís a resonance flap. Itís purpose is to eliminate intake resonance between the two banks for smoother airflow at higher RPMs, similar to an exhaust crossover pipe.

Iíve read that it can cause a flat spot at around 5k if not operating properly, but no personal experience.
Makes sense. Thank you! I'll report back what I find.

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