Distributor vacuum advance mechanisms, Test results, Fuel pump testing – Actron KAL2512 User Manual
Page 4
3. Return idle screw and idle air bleed
screws to original positions, if required.
4. Re-enable the ignition system
5. Reconnect wire to idle stop solenoid.
6. Reconnect all hoses and vacuum lines.
7. Reinstall PCV valve.
Distributor Vacuum Advance
Mechanisms
1. Disconnect hose from distributor
2. Insert a tee connector in line with
hose and another back to distributor.
3. Connect gauge to the tee connector.
4. Start engine and note vacuum at idle.
5. Slowly increase RPM noting vacuum
pressure.
Test Results
2 possible results are:
A. Vacuum manifold pressure should
drop as engine speed is increased
per vehicle manual
B. If vacuum manifold pressure does not
change or changes very little check for:
Vacuum hose being opened or
cracked
Diaphragm in advance mechanism
punctured.
NOTE: Vacuum reading can appear
normal during the above test but still
have a bad advance mechanism that is
frozen due to corrosion or dirt.
Fuel Pump Testing
Fuel Pump Testing can be done using
the 0-10 psi scale on the gauge. Make
sure to follow manufacturers
instructions exactly and follow all safety
precautions.
©2004 Actron
Manufacturing Company. All rights reserved.
0002-003-1862
0
Engine
Vacuum
5
10
15
20
25
30
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Fuel
Pump
psi
Idle
Speed
Screw
Idle
Mixture
Screw
Electrical
Connector
Idle Stop
Solenoid
Air Cleaner
Manifold
Vacuum
Closed
Breather
Cap
Rocker Arm
Valve Cover
PCV Valve
Using Fuel Pump Scale