Maserati Manual MK1
Mistral + 3500 GT Owner's Manual
Injection systems - Problems and solutions.
To make a complete check you need the following equipment:
Current meter - amp meter (0 to 30 amphere), Volt meter (0 to 15 volts),
Pressure gauge (0 to 10 atmospheres - 0 to 147 p.s.i.)
WHEN THE MOTOR DOES NOT START
If you know that you have enough gasoline in the tank, that the ignition
system is working properly, and that the starter is also
working properly, by inserting the key, you should hear the pump working.
1) If you do not hear the pump working, put the current meter on the input line
to the pump.
If it indicates an input of above 10 amphere, replace the pump since it is
jammed. If on the contrary - the input is 0, check for electric
breakdown which will be in the pump. If the volt meter shows an input of 12
volts, but will be in the electrical system if not.
2) If you can hear the pump working, check to see if the gasoline reaches
the distributor by unscrewing the connecting bolt
(see figure 18D). If the gasoline does not reach the distributor, insert the
current meter and check for current input.
If the current input is two to three amphere, this will show that the pump is
idling and that there is an obstacle to the gasoline
reaching the pump. Therefore, you should check the tank filter and the
lines between the tank and the pump and see if
they are obstructed. Then check the filter cartridge of the pump itself to see
if it is dirty.
The same problems may result from an air intake due to a faulty seal of the pipe
fittings or of the lower cover of the pump. You
must therefore check that the whole system is well sealed. After checking that
the gasoline reaches the distributor, unscrew anyone
of the injectors and keeping the connection with the input line, insert the
1) If the spray is regular, you can discard the idea of a malfunction in
the injection system.
2) If there is no spray, even if you use the choke, the distributor is jammed
and you must replace it. To check this problem,
unscrew the connecting bolt (see figure 43A) on the distributor and have the
motor run with the help of the starter.
You will see at the inside that the distributor rotor is standing still.
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