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Replacing the A4LD Vacuum Modulator

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Old 03-20-2008, 08:42 PM   #1
sleeper_inc
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Default Replacing the A4LD Vacuum Modulator

Click the image to open in full size.
Click the image to open in full size.
If your Modulator has failed (like mine) then when you take the vacuum line off transmission fluid will drip out (flow out)

Click the image to open in full size.
Loosen the bolt (its 10MM) and take the bracket out

Click the image to open in full size.
Old modulator on the right, new one of the left

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This is the thin metal pin inside the modulator... DO NOT LOOSE THIS!!!! transfer over to the new modulator

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Click the image to open in full size.
Pictures of the only modulator

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Picture of the new modulator

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Bracket used to hold the modulator in place

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Space were the modulator goes

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New modulator in place with vacuum line hooked up

not so hard to do when the car is jacked up
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1988 Mustang LX
Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 03-20-2008, 09:32 PM   #2
924banger
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Default RE: Replacing the A4LD Vacuum Modulator

What are the symptoms of this failing? nice pics by the way!
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Old 03-20-2008, 09:39 PM   #3
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Default RE: Replacing the A4LD Vacuum Modulator

Later shifts, transmission fluid in the lines, and a wired burning smell (also bad shifts)
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1988 Mustang LX
Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 03-20-2008, 09:58 PM   #4
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Default RE: Replacing the A4LD Vacuum Modulator

cool, just asking for later viewers of this thread. It should be put in the tech articles.
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Old 03-20-2008, 10:07 PM   #5
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Default RE: Replacing the A4LD Vacuum Modulator

Already there

Don't have the contributor badge for nothing [8D]
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1988 Mustang LX
Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 03-21-2008, 05:03 AM   #6
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Default RE: Replacing the A4LD Vacuum Modulator

how much did it cost you for the new one? And where did you buy it at?
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Old 03-21-2008, 08:40 AM   #7
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Default RE: Replacing the A4LD Vacuum Modulator

$15, and I got mine from auto parts plus. Any store should carrie it
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1988 Mustang LX
Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 03-21-2008, 09:55 PM   #8
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Default RE: Replacing the A4LD Vacuum Modulator

checked mine today and it was leaking badly. So i replaced it and figured i would change the filter and fluid in the tranny also. Well come to find out my trans is out of a 90 mustang even though my mustang is a 91. Drove nearly clear across town to the parts store that had the 91 filter to find out it didnt fit F*** me. Should have double checked.

Sleeper does your new one have an adjustment screw on it?
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Old 03-22-2008, 06:43 AM   #9
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Default RE: Replacing the A4LD Vacuum Modulator

Yes it does, but thats because its the turbo one (highly recomend it since you can change your shift points with it)
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1988 Mustang LX
Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 03-22-2008, 07:35 PM   #10
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Default RE: Replacing the A4LD Vacuum Modulator

good thats the one i got glad to hear i can adjust my shift points now!!!!
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Old 04-09-2008, 09:12 AM   #11
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Default RE: Replacing the A4LD Vacuum Modulator

I used to have a 93 mustang lx, and now I have one again. The old one would drop to idle when you released the accelerator, but this one doesn't.

Is that another symptom of a bad regulator, or is that a bigger problem?
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Old 04-09-2008, 04:52 PM   #12
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Default RE: Replacing the A4LD Vacuum Modulator

The RPMS should slowly go down with the speed, acts like a brake sorta.

The only way to know if its blown is to take the vacuum line off it and see if transmission fluid comes streeming out
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Ex 2.3 N/A car, built 2.3 turbo with LOTS of goodies! now I gotta find a rear end and a ps/pump XD

1989 Ranger STX 4x4
2.9L auto
274,xxx km's
tinted windows, 2 - 12" kicker comps with a 400.1X at 500watts
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Old 04-09-2008, 06:00 PM   #13
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Default RE: Replacing the A4LD Vacuum Modulator

Nice post bro
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Old 06-21-2010, 05:38 PM   #14
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I just replaced mine cause a bunch of fluid poured out, but the car still has trouble going into gear for some reason, if i rev it up to 3k it wil usually pop into gear and go but will go back out of gear if i take a slow turn or at the lower gears. i hope this is not a failing transmission....
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Old 06-21-2010, 06:14 PM   #15
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i think ill also replace the 1/4" rubber hose, also, ifthere was fluid left in there when i put the new one in could that cause it to have same problems? also when i pressed on the new modulator to make sure i put it in right, after i drove to get smokes and back, a bit of tranny fluid came out of the hole..

ill replacethe hose since maybe the old one isnot securing tightly im guessing it could lose suction and cause same problem.. otherwise idk im at a loss..
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Old 06-21-2010, 08:16 PM   #16
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Hey, just wanted to point out i resolved my issues. Had to do a couple more steps on my own heres what I found.

The small black hose that was initially unplugged and checked for fluid was replaced since it wasnt as tight as I expected it to be...

All vaccuum lines were unplugged and drained one at a time since I had alot of tranny fluid in them I guess thats why the problem was not resolved... A couple of the lines had an inch cut off the end and then plugged back in to make a tighter fit... just make sure you can afford to clip the end off before doing so, evin still new ones are only about a buck or two a foot....

I checked fluid level and tranny fluid was quite low since so much escaped into the lines...
I added a whole liter slowely and check level throughout...

everything is perfect, thanks for this post you rock...
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Old 05-20-2011, 09:11 AM   #17
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GOOD DAY

would that module allow my car smoke it seem that when my tranny started to act up it started to blow smoke it would qiet and the start up after the trans would act up
check fliuds and i have no water in oil ?
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Old 06-23-2011, 08:56 AM   #18
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I took out my modulator and the metal pin was not there. Does anyone know where I can get a new one so my truck will shift properly?
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Old 06-27-2011, 10:32 AM   #19
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found one now just got to adjust it...
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Old 06-27-2011, 10:32 AM
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1966, 1992, 90, a4ld, amount, bad, fluid, length, modulator, mustang, pin, replacing, symptoms, transmission, vacuum

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