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Replacing the A4LD Vacuum Modulator

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Replacing the A4LD Vacuum Modulator - 3/20/2008 6:42:50 PM   
sleeper_inc



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If your Modulator has failed (like mine) then when you take the vacuum line off transmission fluid will drip out (flow out)


Loosen the bolt (its 10MM) and take the bracket out


Old modulator on the right, new one of the left


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



Pictures of the only modulator



Picture of the new modulator


Bracket used to hold the modulator in place


Space were the modulator goes


New modulator in place with vacuum line hooked up

not so hard to do when the car is jacked up


< Message edited by sleeper_inc -- 3/20/2008 6:54:17 PM >


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RE: Replacing the A4LD Vacuum Modulator - 3/20/2008 7:32:26 PM   
924banger

 

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What are the symptoms of this failing? nice pics by the way!

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RE: Replacing the A4LD Vacuum Modulator - 3/20/2008 7:39:33 PM   
sleeper_inc



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Later shifts, transmission fluid in the lines, and a wired burning smell (also bad shifts)

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RE: Replacing the A4LD Vacuum Modulator - 3/20/2008 7:58:51 PM   
924banger

 

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cool, just asking for later viewers of this thread. It should be put in the tech articles.

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RE: Replacing the A4LD Vacuum Modulator - 3/20/2008 8:07:22 PM   
sleeper_inc



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Already there

Don't have the contributor badge for nothing

< Message edited by sleeper_inc -- 3/20/2008 8:08:30 PM >


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RE: Replacing the A4LD Vacuum Modulator - 3/21/2008 3:03:21 AM   
usermst9673

 

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how much did it cost you for the new one? And where did you buy it at?

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RE: Replacing the A4LD Vacuum Modulator - 3/21/2008 6:40:07 AM   
sleeper_inc



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$15, and I got mine from auto parts plus. Any store should carrie it

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RE: Replacing the A4LD Vacuum Modulator - 3/21/2008 7:55:21 PM   
usermst9673

 

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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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RE: Replacing the A4LD Vacuum Modulator - 3/22/2008 4:43:53 AM   
sleeper_inc



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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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RE: Replacing the A4LD Vacuum Modulator - 3/22/2008 5:35:37 PM   
usermst9673

 

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good thats the one i got  glad to hear i can adjust my shift points now!!!!

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RE: Replacing the A4LD Vacuum Modulator - 4/9/2008 7:12:24 AM   
WyldeSoul

 

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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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RE: Replacing the A4LD Vacuum Modulator - 4/9/2008 2:52:50 PM   
sleeper_inc



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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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RE: Replacing the A4LD Vacuum Modulator - 4/9/2008 4:00:15 PM   
hellion_79



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Nice post bro

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