Checking Vacuum Control; Checking Pressure Regulator - Porsche 928 Workshop Manual

928
Air Flow Controlled Fuel Injection
24
a
CHECKING VACUUM CONTROL
Run engine at idle speed.
Pull conrrol hose for decel valve off of branch
and connect hand vacuum pump US 8026.
Decel valve will open and idle speed rise when
vacuum is sufficient.
CHECKING PRESSURE REGULATOR
1. Take off air cleaner assembly.
2. Connect pressure gauge with hose from pressure
tester P 378 on testing connection.
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3. Fold up foot support in footwell of passenger' s
side and pull fuel pump relay off of central
fuse/relay plate.
Printed inGermany _ lV, 1980
Checking Vacuum Control
Checking Pressure Regulator
24 - 19