Porsche 928 S4 Technical Specifications

 

 

 

Testing and Adjusting Specifications

 

Model year

Engine type

Mod. 87 …89

M 28.41/42

Mod. 89

M 28/47

Test Point

Specifications

Specifications

Electric fuel pump Delivery rate

at least

1250 cm3/30s

at least

1250 cm3/30s

 

Fuel pressure (engine stopped)

Fuel pump relay bridged

 

 

3.8 ± 0.2 bar

 

 

3.8 ± 0.2 bar

 

Check value for idle

approx. 3.3 bar

approx. 3.3 bar

 

Leak test

Min. pressure after 20 min.

 

3.0 bar

 

3.0 bar

 

 

 

 

M 28.41/42

M 28/47

 

 

Idle setting

without catalytic converter

 

with converter

without catalytic converter

 

with converter

Idle speed (rpm)

 

675 ± 25

 

675 ± 25

 

775 ± 25

 

775 ± 25

 

CO level %

0.5…1.5

0.4…1.2

0.5…1.5

0.4…1.2

 

HC-levels ppm

<300

<300

<300

<300