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JDM Evo 7 AYC pump causing voltage drop/oscillation. Please Help!

785 Views 5 Replies 4 Participants Last post by  richyx
Hey guys,

I've been trying to figure this out for some time now, my AYC pump causes a large voltage oscillation when its pumping. (it always pumps after 50% throttle or so and turns on even in straight line) The voltage oscillation causes my dash lights to flicker/dim and my AFR goes up and down because the injectors areing seeing linear voltage at WOT. There have been a few others with the same problem on here but it never came to a conclusion. Another thing i noticed is when i have the engine off and ignition on and i step on the throttle, the AYC pump keeps pumping and never shuts off. Here is a thread with the same electrical problem.

Any help is greatly appreciated!

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Thanks for the reply guys! I really appreciate it, looks like its time to pull the pump out and rebuild it. Can anyone recommend a website where i can buy the rebuild kit and new pressure sensors?
Just post it to the man above he's not cheap but does a great job. Piece of mind then with a warranty etc
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