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When you say flap I assume you're refering to the afm?
I don't think the knock sensor is absolubtely necessary, I know what detonation sounds like.
You're gonna have to fill me in on this fuel cut at 4 psi business. I didn't realize that the 4age used any engine load sensor apart from the afm. How does the computer know about the boost?
I'm also not following what you are saying about econo fuel switches and the ECU defaulting to prem curves.
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