trans vacuum lines
Posting Guru
Joined: Feb 2007
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From: Pittsburgh,Pa.
Henry, your 302/C4 combo uses 1 vacuum line to the trans modulator. There is a vacuum port in the manifold just behind the carb. Use this as your trans vacuum source not the carb. If you have power brakes the booster is normally tied into the same port.
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Senior User
Joined: Jul 2008
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From: Fountain Inn S0. Car.
truck was running fine, then shifting problems first then starting problems, at a point where it could be wires, cap rotor...etc, as i started looking these vaccuum lines appear as they were not connected, seems like advance problems, but the advance sol. has a conn. source.. any help is appreciated...
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From: Fountain Inn S0. Car.
that is the combo that I have.. also
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Posting Guru
Joined: Feb 2007
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From: Pittsburgh,Pa.
Pappie, I'd check your starting problem first. The shifting problem may be a result of power loss.
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Senior User
Joined: Jul 2008
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From: Fountain Inn S0. Car.
thanks for the reply, it starts right up now, but sometimes it bogs and then catchs, crazy shifting, but cant find any vaccuum leaks, it probably needs full tune up first, and all new hoses, cant just keep patching it up..it was fine and then all this started..everything is just old and worn out. still open for all the help I can get...
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Joined: Feb 2007
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From: Pittsburgh,Pa.
Pappie is it smoking a bit by chance? Trans modulators have been known to fail and allow trans fluid to be drawn into the engine and burned. This can cause rough running and erratic shifting.
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Joined: Jul 2008
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From: Fountain Inn S0. Car.
hello again and thank you for your help, it doesnt smoke when its running but it always put out one puff when I start it... but I think that since this problem started it is a bigger cloud when started..and the trans fluid is a bit low, and it had been staying full. the trans was rebuilt just before I bought it..
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From: Fountain Inn S0. Car.
I wS thinking that smoke on starting is worn valve guides?, havn't done comp. test, or too much of anything as the truck was running fairly well, weak oil pressure after it gets good and hot..rebuilt the rear axle and brakes, thats all I've done to it...
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From: Fountain Inn S0. Car.
It was dry, but replaced the flex hose, I am going to replace the lines, and points, cap etc... but I think it is the choke, carb..this is all orig. fix it when it breaks..