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 %

0.51.5

0.41.2

0.51.5

0.41.2

 

HC-levels ppm

<300

<300

<300

<300