Service Kits. Engine Products. Cooling Products. Drivetrain Tools. Best Sellers. Support Technical Resources. Need help finding what you are looking for? Company About Us. What's New. Warranty Registration. CPG Nation. Warranty Policy. Privacy Policy. For your car to shift appropriately, the automatic transmission vacuum modulator must analyze how hard the engine is working.
It does this in two different ways. Looking for a good online repair manual? Click Here for the 5 best options. Even though some car makes and models have simple cable linkages attached to a throttle valve in the automatic transmission, it still serves the same purpose. However, with the help of a vacuum modulator in other vehicles, the automatic transmission exerts pressure on the throttle valve.
Problems might start while shifting gears if the automatic transmission vacuum modulator starts malfunctioning. When the hose is removed, look for transmission fluid in the hose. Shake the end of the hose and see if any transmission fluid comes out.
No vacuum line to the transmission. The transmission can be controlled. A vacuum leak will cause the engine performance to suffer, causing load and throttle position issues which could affect transmission shifting. The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points.
The transmission vacuum modulator effectively works by consistently computing the load in your car's engine with the diaphragm. As soon as a gear change is executed in line with the load demand, the diaphragm pushes the valve to prompt the spring to move in the reverse direction of the diaphragm. What can cause a transmission not to shift? One cause to rule out is low fluid level or a plugged transmission fluid filter.
Delayed shifts can also be caused by internal hydraulic leaks in the valve body or failing internal transmission seals found on clutch pack pistons and piston o-rings. What is causing my transmission to shift hard? The most common cause of hard shifts is a low fluid level, so check your fluid level and add BlueDevil Transmission Sealer if it is low. Jerky shifts can also be caused by excessive line pressure due to a clog or malfunctioning shift solenoid.
How does a vacuum modulator valve work? The modulator valve is attached to the intake manifold with a vacuum line. It senses intake manifold vacuum and shifts the transmission accordingly: When you press down on the gas pedal, the throttle plate opens, and vacuum is reduced. The modulator valve will cause the transmission to downshift. What happens when a vacuum modulator goes bad? The main symptom you will notice is poor engine performance.
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