94 A4LD Vacuum Modulator Replacement

Dec 23, 2004 2 Replies
R

I have determined that the vacuum modulator is defective (tranny fluid in the vacuum hoses) and have a replacement ($37.50) to install.



I removed the passenger seat and console and peeled the carpet up to expose an access cover on top of the tranny hump.



It appears one bolt/stud secures the modulator and a heat shield of sorts.



My question is: Knowing there is a pushrod when I pull the modulator, can this rod be lost inside the tranny case or is it more likely to simply fall out upon removal of the modulator?\



Thanks in advance.


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J

The pin fits in a recess in a spool valve and can't fall into the trans.... they do, however, like to fall into a place either inaccessible or crude.

For the curious, the vacuum modulator, pin and spool valve 'modulates' transmission line pressure using engine vacuum to indicate the amount of load on the engine. Low vacuum drives the line pressure high to prevent slipping bands and/or clutches. High vacuum indicates light engine loading and drives line pressure low - this reduces the horsepower required to run the transmission pump and allows for a softer shift feel.

HTH

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