'95 4.0 Vacuum modulator oddity
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'95 4.0 Vacuum modulator oddity
My '95 Aerostar 4.0 no longer likes to shift out of first gear. It will if I accelerate to maybe 25mph and completely get off the throttle for a few seconds. (It also revs freely at full-throttle kickdown, as though it was in neutral.) A fluid and filter change didn't help, so I dug into forum posts. I found the vacuum modulator, and there's no ATF in the vacuum line, but it's an adjustable one which has me baffled...
The modulator has a thumbwheel on the outside of it. It will unscrew completely - and then it comes off, with a pin attached to it. This is very different from the ones I've seen pictures of here, where the pin is moved by the diaphragm. Is this the same pin, or some kind of preload device for the actual pin farther inside?
There's enough else wrong with the Aerostar that I'm not willing to sink very much more money into it. It'll run as is, as long as I'm careful. I'm just trying to get a few more miles out of it... might a regular, non-adjustable modulator help?
Thanks!
The modulator has a thumbwheel on the outside of it. It will unscrew completely - and then it comes off, with a pin attached to it. This is very different from the ones I've seen pictures of here, where the pin is moved by the diaphragm. Is this the same pin, or some kind of preload device for the actual pin farther inside?
There's enough else wrong with the Aerostar that I'm not willing to sink very much more money into it. It'll run as is, as long as I'm careful. I'm just trying to get a few more miles out of it... might a regular, non-adjustable modulator help?
Thanks!
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From: NEPA
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this link may help...
https://www.ford-trucks.com/forums/8...irst-gear.html
https://www.ford-trucks.com/forums/8...irst-gear.html
If nothing else comes along, I may try backing up slowly and shifting into Drive while still moving. Many drivers do that kind of thing regularly, so it shouldn't leave the tranny in the road, and doing it a few times might help. Hey, people used to bang on their TV sets all the time...
EDIT: Replaced the vacuum modulator but no change in symptoms.
Last edited by Two99Point80; Mar 22, 2011 at 12:14 PM. Reason: modulator replacement
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