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EXTRA-INJECTIONS SENSITIVITY.
The EXTRA-INJECTIONS are very short injections performed additionally to the normal injection
and are carried out during the petrol feeding, usually during acceleration, to enrich slightly the
carburetion increasing the engine yield.
The extra-injections can be recognized by observing the signaling LED or the movement of the
point.
During the gas operation, if we manage the extra-injections as a normal injection we could enrich
too much the carburetion risking to increase the engine revolutions jagging (this occurs above all
in the methane plant; in the LPG ones this problem is usually less relevant).
By enabling the tick next to “EXTRA-INJECTIONS SENSITIVITY” it is possible to modify the pa-
rameters concerning the gas extra-injections increasing or decreasing the opening time of the gas
injectors during the extra-injection. By shifting the slider towards the negative sign (-), the extra-
injected gas time decreases and the mixture becomes weaker. By shifting the slider towards the
positive sing (+), the gas extra-injections time increases and the mixture becomes richer.
By not enabling the tick, the extra-injection is not considered as such and the gas control unit
manages the impulse as a normal fuel injection.
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LEANING ON MAZDA.
On some MAZDA models, during the petrol feeding during acceleration, a switching occurs from
a SEQUENTIAL type injection mode to a half-group injection mode with opening by pairs of the
petrol injectors.
This condition can be easily recognized observing during the acceleration the movement of the
RED point on the map or the PETROL injection time.
During the switching from one injection mode to the other, it is possible to observe that the injec-
tion time usually displayed acquires a value equal to about the half of the one previously carried
out (for example from about 8 ms it shifts to about 4 ms) and a continuous variation of the RED
point is displayed between these two values or, in some cars, such point remains fi xed on a given
number of revolutions to return consequently to the initial PETROL injection time.
During the gas operation this work condition can cause malfunctions since when the injection
switches from a sequenTIAL mode to a half-group mode (low injection time), the GAS carburetion
tends to enrich very much causing rips.
Therefore, to avoid this problem, just enter under “Weakening on MAZDA” a proper value to con-
trast this trend.
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TARGET
By pressing the push-button REC, it is possible to store on screen the petrol time (PETROL time)
(with petrol feeding) on a given area of the map to ease the comparison with the petrol time (PE-
TROL Time) (with gas feeding) in the same condition.