Maserati Manual MK1
Lucas World Service News WSN604 Export
Mistral + 3500 GT Owner's Manual
TEST
C.5 Faulty Control Unit
METHOD
(i) Proceed. as "Engine will not Start" (FAULT A ) METHOD A.5 and hence A.12.
(ii) In addition to this procedure, the barometric datum wedge may have stuck in the out
position, and insufficient fuel quantities
are being
injected into the cylinders. This condition will be
found to improve
when the excess fuel lever is moved slightly towards the excess fuel position.
(iii) A further possible cause is a stuck piston in the Control
Unit. Manipulating the connecting link between the fuel
cam and the control
piston axially with the ignition switched OFF,
should ascertain this fault.
N.B.
If the lead from the thermal switch to the oil-pressure switch is disconnected
(A5) during the test, remember to RECONNECT on completion
of the
diagnosis.
ACTION
a) If the Control Unit appears satisfactory, proceed to C.6.
b) Should
a fault be found in section:- (i) Proceed as 'Engine will not start' (FAULT A)
ref. A.12 (b) (ii) or (iii) A replacement
Metering/Control Unit should be
fitted.
TEST
C.6 Faulty Metering Distributor
METHOD
The fault is
probably a sheared drive
to the Metering Distributor rotor, causing the rotor to run "out of phase" or
intermittently.
Proceed to Fault A,
directly to Method A11, and
by prolonged visual observation of the Metering Unit Rotor, the fault may become
apparent as intermittent rotation.
ACTION
a) If the Metering Distributor is functioning satisfactorily and the diagnosis has not revealed
the cause, then an additional probable cause
is leaking '0' ring at the
banjo-bolt, allowing unmetered fuel to be injected. This is an internal fault,
and no external evidence of leakage
should be apparent. A progressive analysis will reveal
the faulty '0' ring(s).
b) If a fault is found, proceed as A.11 (a) to remove the complete Metering/Control Unit. A
replacement should then be fitted. Page 14
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