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Tec3r Manual Version 1.11
- Page 112 -
©2017 Electromotive, Inc.
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If the LED is functioning normally, check for spark at the coils. Remove the two spark plug
wires from the coils, and watch for a spark between the coil towers during cranking. BE
EXTREMELY CAREFUL NOT TO TOUCH THE SPARK!! It will really be painful, and
can be deadly to people with pacemakers!
If there is no spark, check the wiring to the DFU and to the
Tec3-r
. Pin D on the DFU
should have +12volts with the ignition key on.
If the wiring is good, and the coils are still not firing, look to the software. Make sure
the appropriate calibration file is loaded.
If there is spark across the coil towers, but the engine will not run, check the plugs and
plug wires. Also be sure that the coils are firing the appropriate cylinders (see
Section
C.3.
)! An engine will not run (or will run very rough) if the plug wires are not going
to the appropriate cylinders.
If the engine backfires through the throttle, check that “mechanical timing” has not been added or
subtracted with an improper trigger wheel installation.
M.1. Idling Problems
Sections B.3.
and
B.6.
should be consulted to determine problems with idling that are tuning-related before
any troubleshooting is undertaken.
M.1.a. Air-Related Idling Problems
If using an IAC motor, and the engine is surging at idle, turn the IAC control OFF.
o
If the engine idles nicely, it is likely an IAC tuning problem.
o
If the engine still surges, it is likely an air-fuel mixture problem.
If using an IAC motor and the engine runs rough at idle, it is likely an air-fuel mixture problem.
If the IAC motor does not seem to be functioning at all, check the TPS closed throttle voltage. This
value must be ABOVE the actual TPS reading at closed throttle in order for the IAC motor to be
engaged.
If the engine idles too high, either the IAC motor is not functioning, the RPM value set in the
calibration file is too high, or the throttle plate is opened too far.
To check for proper IAC functioning, the pintle should retract fully when the ignition key is first
turned on. The motor should then move out by the specified amount in the IAC motor settings.
M.1.b. Fuel-Related Idling Problems
Check for stuck injectors and fuel pressure problems if the idling characteristics cannot be improved
through tuning (see
Section K.1.
on Fuel Related Starting Problems to see if the fuel injectors are
functioning properly).
If the engine is blowing black smoke out the exhaust during idling, the mixture is too rich. Decrease
the POT, or decrease the VE Table values at the problem area.
If the engine misfires at idle, the mixture is probably too lean. Increase the POT, or increase the VE
Table values at the problem area.
M.1.c. Spark-Related Idling Problems
Check for wiring problems before attempting to correct an idling problem. If the plug wires are run
correctly, and the DFUs are powered correctly, check the ignition advance table.
Engines typically need at least 10
o
of timing to idle smoothly. Check the Timing Advance Table at
the idle MAP/RPM points.
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