Transmission fluid in vacuum line

[Malchi]

Ok, the vacuum line going from my intake to the cruise control is real flimsy and makes a vibrating noise. So, pulled off today to get a new one, and, low and behold, transmission fluid came spilling out of it.

No, after searching on this forum, I am getting the impression that it is likely my modulator on trans that is bad. But, before I go thru all that trouble, was wondering if some one can verify that. Or, tell me how to diag it to make sure.

Also, fwiw, what does the modulator do? If it's bad, will it hurt much if I leave it like that? Other than the risk of plugging my cat, or fouling my plugs?

 

[geoph1986]

It sounds like the modulator to me. Trans fluid in the vac line is the tell tale sign. The modulator is for shifting into OD. If you just leave it like that, you will end up with trans fluid in your engine oil. Trans fluid isn't a very good lubricant for the engine.

 

[BrooklynBay]

Unplug the vacuum line going to the modulator, and see if it has transmission fluid inside of it. If it does, then replace the modulator, and clean the vacuum tubing with Seafoam.

 

[mawrazen]

You have a bad transmission modulator valve.

Parts $20
Labor $100

Get-r-dun Good Luck!