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Old 09-05-2013, 11:45 AM   #1 (permalink)
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Default Auto transmission vacuum line

I am putting a new..er engine and transmission in a 1989 Suzuki Sidekick, it is the 1.6 8 valve with the 3 speed automatic. Before putting them in I am changing some worn or rusty bits like the trans cooler lines. While working on them I also noticed the what I believe to be the vacuum kickdown line that goes from the intake manifold to a diaphragm unit near the back of the trans oil pan, right behind the kickdown cable, is not looking too healthy either. My question is, between the diaphragm unit and the metal vacuum hose there is a little piece of rubber hose, is that what attaches the hose and diaphragm together or is the metal line actually physically, ie screwed in or part of, the diaphragm unit? If it is just attached via the rubber hose I can easily replace hose with another, but if I have to remove the vacuum diaphragm unit it could turn out to be a pain and I will just leave it. Attached is the image of the area I am talking about.
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Old 09-05-2013, 01:34 PM   #2 (permalink)
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Yes you can just take the hose off the modulator and replace it with a new piece.
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Old 09-05-2013, 01:39 PM   #3 (permalink)
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That is a horribly ugly vacuum modulator. Actually, when people have shifting problems on the 3 speed, this is probably the first thing that they replace, and this may be a good time to replace yours. Make sure you get a similar one - purple stripe - as the stripe colors dictate when/how the car shifts. In order to remove the modulator you need a special (very thin) wrench to do it. I forget the thickness of it - it is posted on the forum. The metal vacuum pipe is not part of the modulator.
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Old 09-10-2013, 08:36 PM   #4 (permalink)
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ok, I decided to take your advice and change the modulator. I ordered one in but it has the red stripe on it. I read that it is supposed to have a purple stripe, should I order in another one or will the red one work? what is the difference between them?
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Old 09-11-2013, 04:20 AM   #5 (permalink)
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The stripes indicate how the modulator is designed to shift the car. The purple stripe is standard for our cars. The red stripe will work, but you may not like the way that it shifts. It's usually better to get the same stripe that was originally on the car, so the car shifts the way it was designed to do.
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'91 Tracker 8V, 1.6L, 5 sp, 4wd, 2dr, conv, CAMI, horribly rusty
'97 Suzuki Vitara 8v, 1.6L 5 sp, 4wd, 2dr, tintop, horribly purple
'61 NSU Quickly - 150mpg
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