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Air Flow Controlled Fuelinjection 944
Testing and adjusting specifications
Model 87 onward
Engine type M 44.40/41 (3.0 I)
Test Specifikation Remarks
Electric fuel
pump
Min. delivery
rate 850 cm
3
/30 s
Fuel pressure
(engine stationary)
DEE relay
jumpered
3.8 +- 0.2 bar
Checking value at
idle
approx. 3.3 +- 0.2
bar
Leak test
min. pressure after
20 Min.
2.0 bar
Idle speed
rpm
CO values %
ppm
without catalytic
converter
840 +- 40 **
0.5...1.5
<= 300
with
catalytic
converte
840 +- 40 **
0.4...1.2 *
<= 300 *
**
Idle speed
can only now be
checked. Idle adjust-
ment no longer
applies.
*
Measured upstream at
catalytic converter and
Lambda HC value
probe connector not
separated
CO adjustment no
longer applies.
Note
Carry out working procedure checking delivery rate of fuel pump and checking fuel
pressure as described an Pages 20 - 102 and 24 - 103 respectively.
Tightening torque for cap nut 12 Nm.
24 - 102
Testing and adjusting specifications
Printed in Germany - XIX, 1989