ACD/AYC Pump Replacement
Unfortunately the time has come and my pump has failed 
Just hit 40K miles. I knew it was just a matter of time before it happened..
Today is the first day to hit single digit temps here in ohio and i know my pump failure has to be related somehow to the extreme cold.. I was just driving on my lunch break when i heard the "ding" and looked down to see that i had the dreaded orange dash with "service required" sign. Once i got back to work i plugged my cobb AP in to pull the codes and confirmed that it was the acd C161e
Well its going to have to wait until spring to get fixed, i refuse to take my car into
I know what i need to do, just cant do it on the freezing cold garage floor 
. someone needs to make a kit to relocate the pump to inside the trunk to protect it from the elements..
Just hit 40K miles. I knew it was just a matter of time before it happened.. Today is the first day to hit single digit temps here in ohio and i know my pump failure has to be related somehow to the extreme cold.. I was just driving on my lunch break when i heard the "ding" and looked down to see that i had the dreaded orange dash with "service required" sign. Once i got back to work i plugged my cobb AP in to pull the codes and confirmed that it was the acd C161e
Well its going to have to wait until spring to get fixed, i refuse to take my car into
I know what i need to do, just cant do it on the freezing cold garage floor . someone needs to make a kit to relocate the pump to inside the trunk to protect it from the elements..
Evo problems... smh
Newbie
Joined: Aug 2012
Posts: 10
Likes: 0
From: New Albany, OH
Yeah it really sucks to happen now, i was saving up for some coilovers and new tires for this upcoming auto cross season, but looks like i have to buy a damn acd pump instead... So it seems like they have about a 4 year life span before they burn out..
The company ACD-Tuning "rebuilds" ACD Pumps that are in working condition, my advice is to purchase a new pump and then send it in to be rebuilt and upgraded with stainless steel components to ward off the corrosion. The rebuilt pump should last a lot longer than the stock one. Also I was told by my tuner and other sources that you will not damage your car if you drive with a faulty pump.
Newbie
Joined: Aug 2012
Posts: 10
Likes: 0
From: New Albany, OH
The company ACD-Tuning "rebuilds" ACD Pumps that are in working condition, my advice is to purchase a new pump and then send it in to be rebuilt and upgraded with stainless steel components to ward off the corrosion. The rebuilt pump should last a lot longer than the stock one. Also I was told by my tuner and other sources that you will not damage your car if you drive with a faulty pump.
Newbie
Joined: Dec 2005
Posts: 80
Likes: 0
From: Boston, MA
The company ACD-Tuning "rebuilds" ACD Pumps that are in working condition, my advice is to purchase a new pump and then send it in to be rebuilt and upgraded with stainless steel components to ward off the corrosion. The rebuilt pump should last a lot longer than the stock one. Also I was told by my tuner and other sources that you will not damage your car if you drive with a faulty pump.
I recall someone just blocking the grill vent in front of the pump to keep grime off of it to prevent corrosion. Not sure if it needs any cooling but I doubt the pump itself is where the cooling would occur anyway.
I just invested in an Evo X this past weekend, I was asking the local dealer about this issue and the service adviser said, just because of how cold it gets here (felt like -44C this morning) that the pump will inevitably fail.
Of course this is covered under my warranty, so I'm not entirely too, too worried but - is this really that frequent of a problem?? Cause if so, I might be looking at replacing this a few times unless I eventually move somewhere warmer.. not cool...
Of course this is covered under my warranty, so I'm not entirely too, too worried but - is this really that frequent of a problem?? Cause if so, I might be looking at replacing this a few times unless I eventually move somewhere warmer.. not cool...
Newbie
Joined: May 2011
Posts: 55
Likes: 0
From: Europe
Not really, the pump fail is more like a feature that comes with the car, and it is not an optional one 
I like how they "improved" the new (2008+) ones by sealing the electric motor too, so that we are one step closer to buying complete pumps.
I like how they "improved" the new (2008+) ones by sealing the electric motor too, so that we are one step closer to buying complete pumps.
Good to know.
Newbie
Joined: May 2011
Posts: 55
Likes: 0
From: Europe
AYC pump electric motor
If anyone wants to see the contents of the sealed electric motor on Evo X:
The wire of one of the brushes got burned.
Probably because of driving the car with the pump stuck. It does send power to motor before it realizes it makes no pressure and stops it.
If pump would fail again, I would eider unplug the pump wire or unplug the relay in the engine compartment.
full-size images
The wire of one of the brushes got burned.
Probably because of driving the car with the pump stuck. It does send power to motor before it realizes it makes no pressure and stops it.
If pump would fail again, I would eider unplug the pump wire or unplug the relay in the engine compartment.
full-size images
Last edited by adrianTNT; Mar 27, 2013 at 11:02 AM.
Newbie
Joined: Jan 2008
Posts: 17
Likes: 0
From: tulsa
I am in the works of purchasing a 2008. Have the 2010 models fixe the issue? I see frosty temps in Oklahoma all winter, and wonder if I might be able to source a "fixed" 2010 model pump out of a different car.
Newbie
Joined: Aug 2012
Posts: 10
Likes: 0
From: New Albany, OH
Unfortunately its the same exact Pump from 2008, no improvement, same part number.
