ACD Buzzing
#1
ACD Buzzing
Update:
It was one of the front, lower ball joint shields. Somehow it got bent out of shape and was rubbing on the brake rotor. I guess that made it vibrate "just right" so that it made the noise.
Now, surely I'm not the first to post about this, but I couldn't find anything in a search. Yes, my brain is toast (it's been a long day), so I probably just missed it. Please link me to the thread if there is one!
In the mean time:, my ACD started buzzing. I bled it, was quiet, then started again. Now... I think I may just need a rebuild because when I bled the ACD unit, I'd have have someone hold down the gas pedal, then I'd open up the bleeder while the pump was pressurizing. I had to be quick because it would only run for about 2-3 sec. Did I do it right? It's been forever and I honestly can't remember.
Anyway... When I'd crack 'er open, I wouldn't get any air, but fluid would only trickle out. I'm 99% sure it used to come out quite a bit. Maybe that was just a LOT of air?? I assumed it would spit and bubble like the brakes.
So.. also assuming I am bleeding it right, I guess the pump is tired and needs a rebuild? It would figure, seeing how I just dropped about $5k in driveline parts to FINALLY be able to drive the damned thing.
Lastly: didn't EvoScan use to have an actuator "button" for the ACD?? If so, it's not there now. Using the gas pedal sucks. It takes forever for the pump to actuate. It's so unpredictable.
The FSM says to bleed the ACD, instead of using the gas pedal to cycle the ACD pump, we just turn the wheel left, right, then center, open bleeder, close. Have I completely forgotten how to do this? I literally haven't messed with my ACD pump since 2010.
I think this is my ACD unit getting me back for talking crap on it in other threads. "Oh, you gon' appreciate me!".
Video:
It was one of the front, lower ball joint shields. Somehow it got bent out of shape and was rubbing on the brake rotor. I guess that made it vibrate "just right" so that it made the noise.
Now, surely I'm not the first to post about this, but I couldn't find anything in a search. Yes, my brain is toast (it's been a long day), so I probably just missed it. Please link me to the thread if there is one!
In the mean time:, my ACD started buzzing. I bled it, was quiet, then started again. Now... I think I may just need a rebuild because when I bled the ACD unit, I'd have have someone hold down the gas pedal, then I'd open up the bleeder while the pump was pressurizing. I had to be quick because it would only run for about 2-3 sec. Did I do it right? It's been forever and I honestly can't remember.
Anyway... When I'd crack 'er open, I wouldn't get any air, but fluid would only trickle out. I'm 99% sure it used to come out quite a bit. Maybe that was just a LOT of air?? I assumed it would spit and bubble like the brakes.
So.. also assuming I am bleeding it right, I guess the pump is tired and needs a rebuild? It would figure, seeing how I just dropped about $5k in driveline parts to FINALLY be able to drive the damned thing.
Lastly: didn't EvoScan use to have an actuator "button" for the ACD?? If so, it's not there now. Using the gas pedal sucks. It takes forever for the pump to actuate. It's so unpredictable.
The FSM says to bleed the ACD, instead of using the gas pedal to cycle the ACD pump, we just turn the wheel left, right, then center, open bleeder, close. Have I completely forgotten how to do this? I literally haven't messed with my ACD pump since 2010.
I think this is my ACD unit getting me back for talking crap on it in other threads. "Oh, you gon' appreciate me!".
Video:
Last edited by kaj; Jan 28, 2019 at 02:55 PM.
#2
EvoM Staff Alumni
iTrader: (3)
You know me Jason, this is beyond my experience. But, no code 82 or the dreaded 3 lites?
Heres a 16 page ACD thread where a lot of symptoms were discussed
https://www.evolutionm.net/forums/ev...l-pay-you.html
Heres a 16 page ACD thread where a lot of symptoms were discussed
https://www.evolutionm.net/forums/ev...l-pay-you.html
#4
I had someone turn the wheel left/right twice before hitting the gas pedal and got much more fluid coming out. We also found if we turn the car off, then back on again, we don't have to wait so long for the pump to run after hitting the gas pedal.
I'll drive it today and see if that was the problem. I'm hopeful, seeing how more fluid was coming out each time and it was more consistent.
I'll drive it today and see if that was the problem. I'm hopeful, seeing how more fluid was coming out each time and it was more consistent.
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#9
I'm stumped. the only thing I did different this time than any other was to use a tie down strap to raise the tcase out of the way enough to not fight with it during my swap. Maybe I raised it enough for fluid to run back?. Even still, it couldn't move too much because the nose was still in the tunnel. I though maybe I damaged the feed line during.. but there is no fluid on it anywhere.
@kikiturbo has offered to ship me his box to test out the pump and see what's up. It provides a way to bleed the pressure side of the pump, which I guess doing the steering wheel/gas pedal thing doesn't quite work.
If that fails, THEN a rebuild.
I'm also trying to figure out if there is a way to cut power to it so I can at least drive the car to Cars N Coffee without embarassing myself LOL
@kikiturbo has offered to ship me his box to test out the pump and see what's up. It provides a way to bleed the pressure side of the pump, which I guess doing the steering wheel/gas pedal thing doesn't quite work.
If that fails, THEN a rebuild.
I'm also trying to figure out if there is a way to cut power to it so I can at least drive the car to Cars N Coffee without embarassing myself LOL
#10
Evolved Member
just unplug the big connector with 2 fat wires that provides power to the pump.. you can unplug the small one too, but you will get 3 lights on.. In fact, if you just unplug the pressure sensor on the pump, it will not work at all.. good test really.
#12
Evolved Member
then it is not the pump...
there is a large electrical connector that powers the pump motor.. unplug that..
there is a large electrical connector that powers the pump motor.. unplug that..
#13
EvoM Guru
iTrader: (1)
If while you're bleeding it, the pump is not making this noise and you have the noise with the pump unplugged, its definitely not the pump. I assume you just had the trans out right?
Almost sounds more like something just right next to the flywheel hitting the teeth. Does it change with revs?
Also sorta sounds like powersteering pump. Have you checked that fluid with the car running?
Almost sounds more like something just right next to the flywheel hitting the teeth. Does it change with revs?
Also sorta sounds like powersteering pump. Have you checked that fluid with the car running?
#15
EvoM Guru
iTrader: (1)
The small plugs on the pump are the solenoid and the pressure sensor. If those are unplugged you'll get a fault and the pump won't run.