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Power dip on NA XR6

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Hey everyone, I’ve been trying to figure out how to get rid of this dip in my power curve. I found when the IMCC valve in the intake manifold changes state, my AFRs go very rich and I loose heaps of power and torque in the process. I’ve tried leaning out my fuel table and advancing spark at 4200rpm but it didn’t do much to help. Is there a trick I’m missing? It almost feels like there’s a parameter forcing fuel in when the IMCC changes state.

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1 hour ago, Puffwagon said:

Is the valve physically moving? Run it up on the dyno and watch it to see if it actually moves.

I think so. I can see a big difference in power when I keep it open

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  • 2 weeks later...
2 hours ago, BarraTuna said:

Any updates ? has the problem been resolved ?

No. I don’t think I’ll hire out the dyno again until I have an idea of how to tackle the power drop

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