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GVR-4 Lean AFR spikes @ WOT w/ LC-1 WB

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EfiniX

Probationary Member
14
0
Dec 5, 2012
Portland, Oregon
Just when I think I've got this car nearly there...

I'm seeing AFR lean spikes from my LC-1 @ WOT. Now I just had an aeromotive FPR installed a few weeks ago, so that's my absolute first thought, but there's not much to an FPR, so after verifying the pressure and that the hose is zip-tied down, I'm not sure what else it could be. Fuel pump? Calibrate the LC-1? Burned-up sensor?

here's what I'm seeing:

AFR is the thick, red line in all images.

Before (smooth):
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After:
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Now the odd thing is that I would think that if the FPR was acting up, I would see a correlative spike in the fuel flow (thick blue line), but I don't. And the O2 sensor output looks good as well.

I'm kinda stumped... I mean I suppose it could be a failing sensor, but is this really how they behave when they go?

logs attached...
 

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