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Where do you run the vacuum line from the turbo 400 trans modulator to an edelbrock performer 800cfm carb?
When you get ready to run the vacuum line from the turbo 400 trans modulator to an Edlebrock Performer 800 CFM carb, attach the vacuum line for the transmission vacuum modulator to the bottom constant vacuum source or the plug that is below the throttle plate. After that, install the vacuum advance to the port that is signaled or right above the throttle plate. Once that is completed, install the large vacuum line to the back of the carb for the power brake.
How do you change the vacuum modulator on a 1978 Chevrolet C20 pu 350 AT Turbo400?
The vacuum modulator is on the passenger side under the cooler lines on a turbo 400. It's held in with one bolt that goes through a clamp that holds the modulator in. To change it put a drain pan under the modulator, pull the vacuum line off it, remove the bolt and clamp, pull the modulator out. Make sure the o-ring seal comes out with it, be sure there's a new o-ring on the new modulator and put it in, replace the clamp and bolt that holds it in and hook up the vacuum line (if it's an adjustable replacement modulator you might need to use a little bit longer rubber line if it has a steel line running down with a short rubber line at the end since some of the old turbo 400's originally had a big canister modulator and the new one will probably be smaller). Then start the engine, check for leaks and refill the transmission as needed. Same procedure on a turbo 350 but the modulator is in the rear on the passenger side pointing towards the back of the car/truck on a turbo 350.
Is there a seal at the end of the vacuum modulator?
There should be an o-ring where the modulator is inserted into the transmission. There should be no fluid where the vacuum line attaches, if so the modulator is bad.
How do you adjust a 350 trany?
There is no adjustments to a 350 Turbo Transmission (GM). The only external thing that would cause shift problems is the vacuum modulator on the side. This is replaceable easily. Check for proper vacuum signal to the modulator. Make sure there are no holes and or kinks in the vacuum line from the engine to the modulator. If none is found, replace the modulator for shift complaints. If it is slipping, the tranmission will require removal and overhaul. This transmission uses wet clutch plates and automatically compensates for wear in the plates to a certain point.
How do you remove the modulator on a 1967 Chevy truck?
Assuming this is a PowerGlide or Turbo-350 automatic transmission vacuum modulator, to minimize fluid loss jack up the rear of the truck and support with suitable jack stands, place a drip pan under the modulator, pull off the vacuum line from the modulator, remove the small bolt and clamp holding the modulator in place, gently twist and pull the modulator out taking care not to lose the small actuator pin inside. Keep the dirt from entering the opening. Install the new modulator with a new o-ring.
How do you change Vacuum Modulator on 350 engine?
The vacuum modulator is located on the passenger side of the transmission, just above the tranny oil pan. It has a vacuum line going to it. It actuates a valve in the tranny for upshifts.
What is require to connect system to telephone line?
A modulator demodulator (MODEM)
How do you tell if the modulator valve is bad on a 1993 Chevy S-10 Blazer?
If your car has one, take the vacuum line to the modulator off and if there is fluid inside, the modulator is bad.
Where is the modulator valve and how do you replace it on a 1992 Explorer?
There is a modulator on some transmissions. If yours has a vacuum line going to the trans, it connects to the modulator and you simply remove the bolt holding it and pull it out.
Where do you attach a vacuum hose to the modulator valve on the transmission of a 305 Chevy?
If your transmission has a modulator it is on the side of the trans and it has a nipple on it for the vaccum line. I you. Mark
1992 caprice transmission losing fluid no visible leaks white exhaust maybe vacuum modulator?
Yes, check the vacuum line between the transmission and the throttle body. If you can see ANY sign of oil in the vacuum line, the vacuum modulator is leaking. Of course, all of that is dependant upon YOUR transmission having a vacuum modulator. Some do, some don't. Generally, they are quite simple to replace, so long as you keep everything clean.
What causes your Suburban 4X4's trans to lose fluid but not appear to be leaking anywhere?
the vacuum modulator can be bad. With the engine OFF, remove the vacuum line at the modulator. If fluid runs out, there's your problem.
