I assume your refering to the vacuum modulator which controls transmission shift points. Remove the vacuum hose from the modulator. Using a small screwdriver, turn the screw inside the modulator. It may take several tries to get it right.
as far as I understand , it does not have a modulator. e4od are electronic. no vacuum shift 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.
Could be no vacuum to the modulator.
Assuming you mean the modulator on an automatic transmission... The modulator help to control the timing of the changing of gears in the tansmission. The modulator uses manifold vacuum to finetune the shift point, lower vacuum means higher load, throttle is open wider, shift point will be delayed.
It's for a modulator valve. The later cars all shift by electronics and signals from the ECM. Yours however still uses a modulator valve and vacuum to assist in determining shift points.
On the 440T4 Automatic Overdrive transaxle the modulator is on the front of the case, A vacuum line leads to it from the intake manifold.
I had this problem on a car once. If it won't shift by itself, but it does shift when you go through the gears manually, it's the vacuum modulator. Replace it and you'll be good to go.
A 1998 Jeep does not have a shift modulator.
I would start by looking for worn vacum line to modulator. Or the modulator could be bad. the modulator is located on the transmission which tells the transmission to shift when the vacum pulls a diaphragm inside the modulator a certain distance. some are adjustable with a flat blade screw i believe.
cable is demand vacuum modulator is vacuum which translates to LOAD> last is governor ,and this is speed bases (rpm at tail shaft) how is that.
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.
No. It relies on the computer and sensors for shift points, firmness, etc. IF it has a vacuum modulator, it likely i s a backup device to get it home in case of electronic failure (which usually means the vehicle won't run anyway)
Dodge transmissions do not use vacuum modulators.Dodge transmissions do not use vacuum modulators.
the 4t60-e transmission uses a shift modulator that can be found at most auto part stores. however i believe the '99 regals use the 4t65-e transmission which are not vacuum operated therefor to up the shift pressure you will need a tuner or a shift kit.
located right on front and top of transmission. Just below and to the left of the airfilter housing. Just follow the vacuum line from front top of intake, right down to transmission, driver side. Pretty easy to find really. Screw it out, screw new one in. Why do you want to replace the modulator valve? I believe this is a electronic shift transmission
If a 1991 Lincoln Town Car will not shift out of first gear, the car should be checked for a vacuum leak. Another item to check is the vacuum modulator which is next to the transmission.
evidentually it is a big secret. They will only tell you where to go to buy one.
It is right behind the right headlight under the battery box attached to the inner fender.
Chrysler does not use modulator valves.
The modulator valve uses hydrological pressure to shift a transmission !
check your fluid level. check for a vacuum leak on the tranny modulator valve.Without knowing what kind of vehicle that is about it.
Overdrive is controlled by the shift solenoid, and vacuum modulator. the kick down you refer to is not overdrive but passing gear and should also be controlled by vacuum.
breather vent on top of tyranny is open to air the only vacuum hose that's hooked up is shift modulator to constant vacuum on manifold
if this is an older type car they use to have a vacuum modulator on the transmission that helped shift. It has a diaphragm in it that breaks and keeps it from upshift.