1987 Ford Aerostar Malfunction - Drive Train & Driveline

Question: the overdrive does not go in

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Owner: it happen two weeks ego I changed the vacuum diaphragm transmission fluid, filter and does not upshift overdrive

Technican: By the vacuum diaphragm, do you mean the shift modulator?Also, is this vehicle equiped with a switch to manually turn the overdrive off and on?A little more info and we'll try to figure it out. Paul

Owner: yes, the switch modulator no, there is not a switch to turn off and on

Technican: Sorry for getting back so late.My computer has been down.When you changed out the modulator, did you check all vacuum lines?If equiped with cruise control, check the cables at control and throttle body. Paul

Owner: check all vacuum lines check cables at control and trottle body if it helps the control is not working good

Technican: Not exactly.The vacuum controls several functions.Any leaks can cause one of them not to operate properly.The cables need to work in unison to insure the throttle body is positioning properly to let the ECM know when a kickdown or upshift is necessary.If all is well in these areas, then another page needs to be turned so as to try and determine the problem.I couldnt tell you from here that it is the cruise control without these checks first.The problem could lay deeper but these would be some of my first checks. Paul

Owner: I replace the vacuum houses. I'm not a mechanic, so I don't know much about it, if you explain in more detail I will help me no overdrive yet.

Owner: Can I get somebody to answer my ???????????? before I get to old?

Technican: Did you notice any other problems when this occured? Does the check engine light come on with the engine running? Have you check for computer trouble codes? Does the transmission never shift into overdrive, or does it try to shift into overdrive but slips/don't move?

Owner: no engine light come on. computer codes? don't know how two weeks ego it was try to shift into overdrive but slips, and that was it not more overdrive.

Technican: Okay, if it shifts into overdrive but slips (or don't work at period) you have internal transmission damage. It's common for these transmission to have problems that effectively require a rebuild.

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