Where is the modulator valve in a vacuum?
Where is the modulator valve in a vacuum? The modulator valve is a part of the transmission vacuum. Inside the canister of the vacuum modulator, the valve works with a diaphragm and a calibrated spring to measure load. What causes erratic shifting in a Buick 200C? Erratic Shifting The 200C Buick transmissions are known for erratic shifting thanks to brittle plastic connectors holding the shift points. Bad modulators may also cause this problem. Also, external sensors on the 4L60E and 4L80E transmissions are also known to go bad and cause erratic shifting. Why is my vacuum modulator not working properly?...