what is it, and why????
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Junior User
Joined: Dec 2001
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what is it, and why????
OK, so I have cleaned the carb on ol hippi hippi shake, and was traceing vac lines.Found a broken line that ran to the vac advance. ( was actually plugged with a nail) So I put a new tee in, but still no vac advance.
So after following the vac lines, there seem to be what appear as two separate temp sending units. One red, one yellow, red on top of the thermostate houseing, and the yellow on the side.Doesn't seem to be any vac running through the red, which has the vac line to the vac advance.
SOOOOOOOO what is it, and does it go bad and block the vac to the distrib advance????????????
So after following the vac lines, there seem to be what appear as two separate temp sending units. One red, one yellow, red on top of the thermostate houseing, and the yellow on the side.Doesn't seem to be any vac running through the red, which has the vac line to the vac advance.
SOOOOOOOO what is it, and does it go bad and block the vac to the distrib advance????????????
Posting Guru
Joined: Jul 2002
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From: East Coast
I think that is one of those gizmoes that gives different amounts of vacuum depending on the coolant temp. I don't remember how it's supposed to work, but if your doing your tests with the engine cold, let it warm up, and vice versa, it might turn on that vacuum port after warmed up.
Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
Vacuum advance is meant to come on after the engine reaches a certain rpm, or load range. The port off the carb will not open until it's required to open, or you would end up with engine ping at idle. Try moving the throttle linkage by hand and see what happens when the engine is running. Incidently, how are you checking to see if it's working?
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Junior User
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well, the engine was definatly warmed up, been running most of the day. I put a vac gauge to the port, and no vac, even when I reved it up. I kinda by passed it, straight to a vac source, but didn't notice any real difference. But when I found it, there was no vac source to it at all. The tee was broken, and plugged off.
Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
I doubt the vacuum advance feed will show on a vacuum gauge, it's a very small amount of pull, when required. Is there any reason you suspect it's not working right when plugged in and the vehical is in operation? Does the engine start to miss under load or highway rpm? Poor fuel mileage?
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Junior User
Joined: Dec 2001
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yes it does, truck shakes when you put it in gear, and drive it. Has smothed out some, but still does it. Also pings under excelleration. See my posting called hippi hiipi shake.
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Thread Starter
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Junior User
Joined: Dec 2001
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so then would the egr valve, cause the shakeing when its put into gear?? Its not a vibration in the drive train, as soon as you put it in gear, and step on the gas, it shakes, almost similar to a chattering clucth, or starting out in too high of a gear on a standard trans. Does this trough the accelleration, and smoths a bit at highway speeds.
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From: Right Next to U
My Toy, From what you're describing reminds me of when my Knock Sensor went bad, it would shake during throttle an ease up after it smooth out some...Replacing it, cured it, I don't know if the 80 models came with a knock sensor. Mebie theres a vac line in the wrong place on your engine...