What happens if the vacuum hose is missing from the transmission?
The transmission will work without this line, but the shifts will be hard as if the throttle was all the way to the floor. If the hose is broken or missing, there will also be a vacuum leak at the carburetor, causing a rough/high idle and possible an intermittent backfire.
Where does the vacuum line go in a truck?
If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor.
How does the transmission vacuum modulator valve work?
by Greg Day. The transmission vacuum modulator valve determines how much load is on the engine so the transmission can shift properly. It has a vacuum line that connects to the intake and measures the amount of vacuum in the engine.
Where is the vacuum hose on a GMC Truck?
Its the silver line next to the trans dipstick tube The year range is pretty non specific. If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor.
Where does the vacuum line go on a GM Truck?
The one coming off the front of is the hard plastic tube, that one goes to the fuel vapor canister, no mystery there. The one on the left is the mystery as the only thing attached to whatever this entire thing is, is the end adapter for the vacuum line so I don’t know if its supposed to be hard or soft or where its supposed to lead.
Where is the vacuum line on a 1999 suburban?
The truck is a 1999 k1500 suburban 5.7 Vortec. Here’s what I’m looking at: If you look closely, there is a second port on the rear of that canister, and that is where the other vacuum line runs to the port near the firewall.
Where does the vacuum hose go in a V8?
Here is the vacuum diagram for your car (BELOW). The 3rd goes to the fuel tank, the smaller hose goes to the MAP sensor. There are not many lines. I was unsure to give you the answer because its V8 and there’s 2 different engines and the vacuum diagrams are different-I can provide the other diagram if you wish-hoping its the one you’re looking for.
How can I find out if my vacuum hose is leaking?
Check if the hose is near or touching a hot surface. Also, check hose connectors, tees, and unions for cracks and looseness. Replace them as necessary. Check the hose for contamination as well, like oil, coolant, or some other substance. Disconnect the hose from the device it connects to and check inside the device connector.