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Conversions
Engine types
Chassis codes
Engine data
Technical data
Manual Transmission
Automatic Transmission
Axles and Steering
Alignment Values
Braking System
Rims/Tires
Performance
Data
Weights
Capacities
From
the Porsche “Technical Specifications” booklet available from 928 Specialists.
928 S4 page
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Testing and Adjusting Specifications
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Model year
Engine type
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Mod. 87 …89
M 28.41/42
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Mod. 89
M 28/47
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Test Point
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Specifications
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Specifications
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Electric
fuel pump Delivery rate
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at
least
1250
cm3/30s
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at
least
1250
cm3/30s
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Fuel pressure (engine stopped)
Fuel
pump relay bridged
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3.8
±
0.2 bar
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3.8
±
0.2 bar
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Check
value for idle
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approx.
3.3 bar
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approx.
3.3 bar
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Leak
test
Min.
pressure after 20 min.
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3.0
bar
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3.0
bar
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M 28.41/42
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M 28/47
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Idle setting
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without catalytic converter
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with converter
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without catalytic converter
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with converter
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Idle
speed (rpm)
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675
± 25
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675
± 25
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775
± 25
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775
± 25
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CO
level %
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0.5…1.5
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0.4…1.2
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0.5…1.5
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0.4…1.2
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HC-levels
ppm
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<300
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<300
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<300
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<300
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