AAC leak

[ryanr2500]

Hey guys,

 

I have done a pressure test from start of hot piping onwards and found the aac leaking.  is this normal when cold?

 

R33 rb25det

 

thanks !

[joshuaho96]

Pretty sure the answer is no. Pretty sure that it's a threaded plate that holds the solenoid-actuated plunger, so the leak is through the plunger and those threads.

[ryanr2500]

Ahh i see.  I also forgot to mention its coming out the screw below it too,  is that the idle adjust screw !?

guess ill hunt for another one.

[joshuaho96]

On 12/10/2021 at 12:53 AM, ryanr2500 said:

Ahh i see.  I also forgot to mention its coming out the screw below it too,  is that the idle adjust screw !?

guess ill hunt for another one.

The screw leaking you can fix with a little bit of teflon tape. The screw is designed to be a controlled vacuum leak across the throttle body so you can adjust the idle. Checking photos online you may be able to save the AAC by re-sealing that brass plate somehow. Personally I would just buy a new one though. Either it's pressed in or threaded in somehow, I haven't seen anyone try to take apart RB25 AAC valves that far to see.