Wiggly vacuum modulator? update, end of page one - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-31-2005, 10:22 AM   #1
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Default Wiggly vacuum modulator? update, end of page one

I noticed yesterday that my vacuum modulator wiggles some if I pull on the vac line. Is that a bad thing or normal? Could it have something to do with my poor shifting behavior (shuddery, or takes too long to grab third)?
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Old 10-31-2005, 10:25 AM   #2
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Wiggly? Sounds very much like it'* coming apart. It would have to be a body failure in my mind. Unless the clamp is loose on the trans.
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Old 10-31-2005, 10:27 AM   #3
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Clamp? I thought it threaded in...
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Old 10-31-2005, 01:44 PM   #4
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I recall it as a clamp similar to the EGR to the SC or something like that. I'll have to go take a peek.

I do have a spare off the Zilla if you need one in a pinch. You get the strut locknut I sent?
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Old 10-31-2005, 02:07 PM   #5
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If they are swappable, I can grab it off the 93 SE. It shifted like new.

Got the nut Saturday. Thank you.
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Old 11-14-2005, 12:06 AM   #6
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Can a bad modulator cause REALLY slow shifts?
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Old 11-14-2005, 02:40 AM   #7
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Yup. If it'* leaking (drawing air in) or if it has trans fluid in it. In either case, a mushy delayed shift will be the symptom.
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Old 11-14-2005, 08:52 AM   #8
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Wiggling and odd shifting ... Have you swapped this out yet?
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Old 11-14-2005, 10:22 AM   #9
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It was on my to do list yesterday, but I forgot.
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Old 11-14-2005, 10:22 PM   #10
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Well, I picked up a new one, along with an tee, elbow, and plug cause the port on the new one is on the front, not the top. Is it a quick swap? If so, I'm gonna go back outside. It'* got a set screw in the port that the guy pointed out to me. How do I know where to set that?
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