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

783 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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the issue is your pump need as rebuild

its drawing more current as its trying to turn a gear against internal corrosion, so more rsistance more current its drawing

another thing is its probably making enough pressure to show the system working too, which is about half its operating pressure

whip the pump off and see whats its like inside bet the centre housing has corrosion where motor bearing sits and corrosion on drive plate

unless its been refurbished but still can be a duff motor
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Just post it to the man above he's not cheap but does a great job. Piece of mind then with a warranty etc
not doing anything at moment with whats going on in the world lol

buy rebuild kits off evoloution hydraulics but unsure if hes posting being we are on lockdown
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