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Discussion Starter #1
Wondering if this rings a bell for anyone.
My Maptun stage 1 05 9-5 aero is performing great at high speeds, however if I’m going around 70 mph and let off the accelerator for a few seconds then floor it, sometimes I get the revs up, no power, and a whizzing sound. No CEL.

Just replaced the fuel pump and CPS.

Thanks!
 

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Possible lock-up torque converter issue: do you see tach needle increase quickly with no increase in speed - like it’s in neutral momentarily?
 

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Hard to say. Only clue is it happens at higher speed when torque converter is supposed to be engaged and you see a temporary increase in RPM.
 
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