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Basically, the amount of vacuum in the intake manifold varies with how much the butterfly valves(either in the carby, or in the throttle body on a fuel injected engine)is opened. If you take your foot off the accelerater, the engine is trying to suck air past the partly closed butterfly, thus creating vacuum. If you are under acceleration and the butterfly is open, the engine is drawing air freely, so manifold vacuum is low. Turbocharged engines have lower vacuum because the air is force-fed, so an electric vacuum pump is sometimes used to run the brake booster.
What else can I help you with?
What is a vacuum modulator?
On some of the older vehicles the vacuum modulator controlled the shift points of the transmission by using the vacuum supplied from the engine.
Do diesel engine produce vacuum when running?
no a diesel does not produce vaacuum when running. but vehicles that require vacuum for the brakes have a vaccuum pump attached to the engine to supply the needed vaccuum
What does the vacuum pump do in an engine?
You must have a diesel. The vacuum pump is what gives you POWER BRAKES and on the newer engines it also makes the power steering work. Only a gas engine makes vacuum. A diesel engine does not make vacuum, so they install a vacuum pump.
When running the AC what would cause the temp to go from cold to hot and the air flow to go from vent to defog for no reason?
A vacuum leak in the vacuum supply line from the engine can do that. Many vehicles use engine vacuum to operate the HVAC system. If there is a loss of vacuum to the system it will default to defrost.
No vacuum to a 99 ford diesel e-350 ac?
The vacuum that operates the doors for an ac system is created from the vehicles engine. Check under the hood for vacuum lines that have cracked or have become disconnected to start.
How a 1969 charger vacuume headlight work?
they work off the engine vacuum through hoses.
Can a vacuum leak be the only problem if the transmission is idling too high?
Well, a transmission itself does not idle...the engine does. A vacuum leak in the engine will cause faster idling or slower idling depending on where the leak is. Newer transmissions do not use vacuum at all for their operation. Older vehicles used vacuum to help with the shifting of gears-automatic transmissions.
Where the vacuum hose that is on the brake booster hook to?
The vacuum hose on the brake booster typically connects to the intake manifold of the engine. This connection allows the brake booster to utilize engine vacuum to assist in applying the brakes, making it easier to press the brake pedal. In some vehicles, the hose may also connect to a dedicated vacuum source or a vacuum pump, especially if the engine does not produce sufficient vacuum at idle. Ensure the hose is securely attached and free of leaks for optimal brake performance.
Air conditioner only works in defrost position?
Not knowing what vehicle you have, many vehicles use a vacuum supplied by the engine to operate the different positions for the air to come out. When the vacuum is absent the system defaults to the defrost mode. I would check the vacuum supply hose starting at the engine for cracks, damage and disconnection.
Why doe brake pedal get hard when turn off engine?
On modern vehicles the brake system is enhanced by a vacuum operated "booster". This makes the brake pedal softer and more responsive. When the engine is turned off the engine no longer produces vacuum to supply the booster so the pedal gets hard.
How are vacuum lines run to and from?
Vehicles made in the USA have a diagram on a sticker located under the hood in the engine compartment. The sticker shows the routing of the emission related vacuum lines. Vacuum lines ae connected to the inlet manifold at one end, to work on the depression at this point. There are several ancilliaries that may work off this, the most popular being the brake servo. Also sensors for the ignition (advance and retard), vacuum servos for 4x4 control, computer management box and emmision controls.
When engine is under load your heater ac doors close and your cruse control doesn't work?
Vacuum issue somewhere Vacuum issue somewhere
