Trying to fix a major vacuum leak. In order to get A/C air out of the panel vents I have to find a way to get some compression braking from the engine, either on a downhill or dropping into second gear or a combination of both. It can take several tries to build enough vacuum. I'm sure that much leakage isn't helping the engine either, so need to fix this leak.
Does anyone have a copy of the vacuum diagram p/n 4306879?
Any "usual suspects" that I should look for?
There are two large diameter hoses going from the carb to under the right side of the cab, and it looks like there's a place for a third hose to connect to a metal tube next to the other two. The metal tube comes up from under the cab and ends where the firewall curves under. The open end is packed w/ road debris. Is there supposed to be a vacuum hose connected to this, and if so where would the other end connect?
Thanks as always!
Matt
Does anyone have a copy of the vacuum diagram p/n 4306879?
Any "usual suspects" that I should look for?
There are two large diameter hoses going from the carb to under the right side of the cab, and it looks like there's a place for a third hose to connect to a metal tube next to the other two. The metal tube comes up from under the cab and ends where the firewall curves under. The open end is packed w/ road debris. Is there supposed to be a vacuum hose connected to this, and if so where would the other end connect?
Thanks as always!
Matt