Publicité
TESTING PROCEDURES CONT.
FUEL PRESSURE REGULATOR
NOTE: To verify a Fuel Pressure Regulator is functioning
properly you'll need a Fuel Pressure Tester along with your
W87032 Vacuum Tester.
1. Do a visual check for leaks around the regulator or signs of
cracks or fuel in the vacuum line at the diaphragm.
• If you find a leak or fuel in the vacuum line replace the regulator.
2. Install the Fuel Pressure Tester to the rail.
3. Start the engine and bring it to temperature and let idle.
4. Disconnect the vacuum line from the fuel pressure regulator at the diaphragm.
• Looking at the pressure tester, the fuel pressure should have increased 10 to 12 psi.
If nothing changes the regulator or vacuum line is bad.
5. Confirm the condition of the vacuum line by connecting it to
the Vacuum Pump.
• The needle should hold steady at 16 to 22 inches of Hg.
• If you have a low, or no reading the vacuum hose is
plugged or bad.
6. Disconnect the Vacuum Pump from the vacuum
hose and plug it.
7. Attach the Vacuum Pump to the diaphragm on the
pressure regulator.
8. Apply vacuum to the regulator and watch the gauge of the Fuel Pressure Tester. The
fuel pressure should increase approx. one pound for every two inches of vacuum
applied to the regulator. If it doesn't the regulator is bad and needs to be replaced
ELECTRICAL /VACUUM SOLENOID
1. Disconnect vacuums and electrical connectors,
make note of the hose locations.
2. With no power to the solenoid, attach the
vacuum pump to port "A".
3. Apply vacuum, and watch the gauge.
• The vacuum should reduce to zero after each pump.
The vacuum is released through the other port, "B".
4. Apply power to the solenoid by using alligator leads.
Ground the negative side to a good metal bracket or
frame. Add 12 volts to the positive side from the battery.
5. Now when you apply vacuum it should not bleed off, holding steady.
6. With the solenoid still connected to power, switch the hose from
your pump to the other side of the solenoid port "B".
7. Now apply vacuum, again it should bleed of. This time through
the intake system.
THERMAL VACUUM VALVES
NOTE: Called different names depending on the make of vehicle:
GM - Thermal Vacuum-Switches (DTVS)
Chrysler/Jeep - Thermal Ignition Control (TIC)
Ford - Ported Vacuum Switches (PVS)
These two-port valves all have the same function, control
exhaust gases from recirculating. When the engine is cold
the valve should be closed.
0
30
Hg
Hg
Vacuum
Gauge
Nornal
15
20
10
5
0
30
Hg
Hg
Vacuum
Gauge
Ignition Timing
15
20
10
5
0
30
Hg
Hg
Vacuum
Gauge
Broken Valve Spring
15
20
10
5
0
30
Hg
Hg
Vacuum
Gauge
Fuel mixture
ELECTRICAL /VACUUM SOLENOID
15
20
10
5
25
0
30
Hg
Hg
Vacuum
Gauge
FUEL PRESSURE REGULATOR
Vacuum Solenoid
0
ELECTRICAL /VACUUM SOLENOID
Hg
5
0
Leaking Intake
Hg
Vacuum
Gauge
Ignition Timing
10
25
5
15
10
0
Hg
5
0
FUEL PRESSURE REGULATOR
Hg
Vacuum
Gauge
Broken Valve Spring
10
15
20
10
5
15
25
10
5
0
Hg
0
30
5
Hg
Vacuum
Gauge
0
Hg
Leaking Valve
Vacuum
Gauge
Nornal
Fuel mixture
10
15
20
10
5
15
25
20
10
5
0
Hg
5
0
30
Hg
Vacuum
0
30
Gauge
Hg
Hg
Vacuum
Leaking Piston Ring
Gauge
Ignition Timing
Vacuum Solenoid
15
20
10
15
EXHAUST GAS RECIRCULATION (EGR)
20
10
5
5
0
30
Hg
Hg
Vacuum
Gauge
0
30
Hg
Hg
Vacuum
Gauge
Broken Valve Spring
15
20
10
5
0
30
ELECTRICAL /VACUUM SOLENOID
Hg
Hg
Vacuum
Gauge
Fuel mixture
30
Hg
Vacuum
Gauge
25
30
Hg
EXHA
15
20
25
20
30
Hg
Vacuum
25
Gauge
30
Mis re
Hg
15
20
25
20
25
5
30
Hg
Vacuum
25
Gauge
Hg
30
Hg
L
15
20
25
10
25
5
30
Hg
Vacuum
25
5
Gauge
Hg
0
Hg
10
25
5
5
25
0
Hg
1
5
25
0
H
7
Leak
EXHAUST GAS RECI
Publicité
