![]() ![]() Or that second line is indeed an input, and used to determine when to downshift, like when passing a car and you need extra ummpth. I was wondering if it might be some kind of vacuum output from the transmission? Used to affect the ignition timing. But I see nothing about that in the C4 Workshop book. One of the posters above thinks it may be a second input to the vacuum modulator. But I was curious why there were two vacuum lines going back toward the transmission, instead of just the one. That makes sense as the transmission shifting points have to change based on engine load. ![]() ![]() Thanks … I’m aware that there’s a vacuum line input to the C4 transmission from the intake manifold, for use by the vacuum modulator or vacuum valve I think is what Ford calls it. ![]()
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