The vacuum modulator valve controls the amount and frequency of vacuum that
is sent to ... The vacuum modulator valve is located inside a vehicle's... ...
Transmission · Vacuum Modulator Valve Chart · Change Modulator Valve on
Ford Truck ...
The valve body is the control center of the automatic transmission. ... The Vacuum
Modulator monitors engine vacuum by a rubber vacuum hose which is ...
Engine testing with a Vacuum Gauge - Technical Articles at Greg's Engine &
Machine. ... indicate leakage through intake manifold gaskets, manifold-to-
carburetor gaskets, vacuum brakes or the vacuum modulator. Low readings
could also be very late valve timing or worn piston rings. ... CHART OF VACUUM
The vacuum modulator valve employs engine vacuum to sense load. A light ... In
our accompanying weight chart, the last two pieces weigh the same but #6 is ...
Manual shift valve inside transmission pan not connected or stuck. Pressure ...
Vacuum modulator or rod malfunction; Governor or fluid passage malfunction.
www.ckperformance.com/Files/112573/VOLUME 1 CHAPTER 6.pdf
of the valve maintains the regulated oil pressure required by the hydraulic .... If
the vacuum modulator system was not used, the shift points would always take.
Troubleshooting Charts For Allison Transmissions AT / MT (B) / HT / V ... Vacuum
modulator vacuum hose to engine kinked or leaking - light throttle shifting
delayed. 2. ... Inspect and replace, if necessary, modulator valve and modulator
FIGURE 18-10. A vacuum modulator installed in a General Motors TH400
transmission. ... Line pressure is applied to port A on the vacuum modulator valve
Jan 11, 1983 ... a vacuum modulator valve means for said transmission for ... 3 shows a chart
indicating the relationship between the pressure signal made ...
N:\common\FLOW CHART COVERS\TRANSMISSION DIAGNOSTIC FLOW
CHARTS. doc. 3L80 ... ERRATIC SHIFT Monitor vacuum to modulator and clean
governor ... Neutral @ 1000rpm / 55 - 70 psi pressure regulator and boost valves