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Nitro 4-Tec 3.3
Troubleshooting Your Nitro 4-Tec 3.3
The following section addresses some very basic engine and radio
questions you may have about your Nitro 4-Tec 3.3. Most questions arise
from simple user errors or minor adjustments that are easy to correct.
If you can’t find a solution for your Nitro 4-Tec here, then visit our Web
site at www.Traxxas.com and click on the Customer Support menu.
There you will find a much more extensive and detailed online
troubleshooting area. In addition, you may call Traxxas Customer
Service at 1-888-TRAXXAS (outside the US call 972-265-8000).
Radio system does not work properly:
If the power light on the transmitter does not come on, check for
proper battery installation and that the batteries are new and/or fully
charged. If the power light is blinking, then the transmitter batteries
are weak and should be replaced. See page 11 for more details.
If the transmitter light is on but the radio is still not responding,
check for proper installation of the receiver batteries and that the
batteries are new and/or fully charged. Check to make sure the
on/off switch on the model is in the on position. Finally, if there is
still no response check the red and black wires that connect the
battery pack to the “batt” terminal on the receiver (you will have to
remove the receiver cover). Make sure the wires are not pinched or
damaged and that the plug is secure in the receiver. See page 13 for
more details.
Short radio range:
If the radio range appears short, then first check to make sure the
transmitter antenna is fully extended and that the antenna in the
Nitro 4-Tec is in place and has not been cut or damaged. Next, make
sure the batteries are all fully charged. Finally, if you are still
experiencing short range, try a different location. Sometimes there
can be interference from various sources that can cause your radio to
malfunction.
Engine will not spin (EZ-Start will not turn the engine):
If neither LED on the controller lights, the EZ-Start battery could be
discharged or improperly connected. Inspect and recharge if
necessary.
If the glow plug LED lights and the motor LED does not, then the EZ-
Start controller is in protection mode. Allow the controller to cool for
at least three minutes. The circuitry should automatically reset.
Check to make sure the wires are connected to the EZ-Start motor in
the Nitro 4-Tec. The red wire should connect to the positive motor
terminal, indicated by a red dot next to the terminal.
The engine could be flooded. If too much fuel accumulates in the
combustion chamber at start up, the engine will hydraulically lock.
Follow the procedure on page 37 for clearing a flooded engine.
Check for binding at the engine flywheel. If you are not able to turn
the engine by hand, the engine could be flooded, there could be
binding in the clutch system, or there could be internal engine
damage. See page 37 for info on clearing a flooded engine and
releasing a stuck piston. (Note: It is normal for the engine to be
extremely tight and hard to turn when the piston reaches the top of
the compression stroke.)
Engine extremely sluggish, hard to start, and will not idle
during tank 1 of the break in:
It is possible that the factory adjusted break-in settings on your
carburetor are too rich for your geographic location, atmospheric
conditions, or fuel brand. Extremes in temperature, humidity,
barometric pressure, and altitude can’t always be accounted for with
a single high-speed needle setting. The symptoms described above
can occur when the air density is very low such as in high
mountainous elevations, and extremely cold temperatures. Under
these conditions, lean the fuel mixture slightly, 1/8 turn, to see if
there is any improvement in starting and idling. Only lean the fuel
mixture just until the engine will run and idle reliably and then
proceed with the break in.
The contents of different brands of fuel (other than Traxxas Top Fuel)
in combination with extreme atmospheric conditions can also make
the factory preset break-in settings too rich and cause the symptoms
described above. Again, try leaning the fuel mixture slightly, 1/8 turn,
to see if there is any improvement in starting and idling.