Gears
Cargo Master
Joined: Aug 2007
Posts: 2,558
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From: New Zealand
The modulator needs to be getting good vacuum to shift properly, or in some cases, at all. The fact that the trans is downshifting as you slow down, means that the governor is doing it's part of the job........sometimes on a C4/C6 they get sticky & play up.
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Senior User
Joined: Dec 2013
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No..........it should go into the intake manifold & get full vacuum; or at least into the base of the carb for the same reason. If it's plumbed in above the throttle plate, it will be getting reduced vacuum as you lift your foot, which is opposite to what it should be 'telling' the modulator.
The modulator needs to be getting good vacuum to shift properly, or at all, in some cases. The fact that the trans is downshifting as you slow down, means that the governor is doing it's part of the job........sometimes on a C4's/C6's they get sticky & play up.
The modulator needs to be getting good vacuum to shift properly, or at all, in some cases. The fact that the trans is downshifting as you slow down, means that the governor is doing it's part of the job........sometimes on a C4's/C6's they get sticky & play up.
Cargo Master
Joined: Aug 2007
Posts: 2,558
Likes: 69
From: New Zealand
Ok well I have done a little bit of research and some people have said that it needs the line needs to plug into the bottom port underneath the choke...would that give it full vacuum? If not would am I going to have to rerout all the lines? If so does anybody have a diagram on how they are all supposed to go? Tried looking it up myself but I couldnt find anything. Sorry for all the questions but thanks for all the help.
Do you have a vacuum tree on your manifold? If so, there might be a spare nipple you can uncap & plug onto. Just check that it is not blocked.
You shouldn't need to re-route any other lines (unless there are other problems), just the one rubber hose that goes onto the modulator line, so it gets full manifold vacuum.
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Senior User
Joined: Dec 2013
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No lines going into the manifold. There are two ports on the back side of the carb cant remember where they go...will try and take a picture and look at it tonight...any way you can pm me with you email so I can send them there it wont let me post pictures on here and that way we can both be on the same page.
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