Possible solutions:
• Use the Trigger Level Adjust function to change the trigger level (threshold) until a
stable RPM is obtained.
• Sometimes the vibration noise may be caused or magni
fi
ed by the minute ‘jerking’ of
the cable connecting to the piezoelectric pickup to the TA300, and providing some
strain relief may be of help in obtaining RPM readings. To provide strain relief to the
piezoelectric ppickup, attach the red wire (which is connected to the pickup ) to the
same fuel line using electrical tape or a cable tie, as shown in Fig 5.
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Fig. 5 - Strain relief setup for piezoelectric pickup
Fuel injection line
Piezoelectric pickup
Electrical tape or cable tie
4.2.3 Weak signal due to the characteristics fuel line or fuel injection pump
There are many factors that may contribute to the piezoelectric pickup not being able to
generate a signal (pulse) strong enough for the TA300 to detect. These situations may
cause low, slow or inconsistent built up of fuel pressure in the fuel line. Some common
causes are listed below:
• Leaky, dirty or damaged fuel injectors.
• Damaged fuel pump.
• Very low cylinder pressure.
• Presence of air in the fuel line.
Possible solutions:
• Change the position of the piezoelectric pickup in the fuel line.
• Place of the piezoelectric pickup to a different fuel line.
• Change the signal sensitivity of the TA300 using the Sensitivity Adjust function (refer
to section ‘3.5.2 Sensitivity Adjust function’ for detailed instructions)
until a reading is
obtained. If the RPM readings are erroneous or unstable proceed to adjust the trigger
level (refer to section ‘3.5.3 Trigger Level Adjust function’ for detailed instructions)
until a stable RPM is obtained..
