Holley MPI PRO-JECTION Installation Tuning And Troubleshooting Manual page 26

Adjust the sensor as follows:
NOTE: If using a laptop computer, go to Data Monitor. Loosen the TPS screws. Adjust the sensor until the throttle angle
reading is 28-30. If a laptop computer is not available, use the following method for setting TPS:
A - Locate the harness wiring that connects to the TPS and remove a piece of the sheathing from the GREEN wire and the
BLACK/WHITE wire.
B - Attach the (+) lead of the digital voltmeter to the GREEN wire (pin B) and the (-) lead to the BLACK/WHITE wire (pin A)
of the TPS.
C - Loosen the TPS and adjust until the voltage is 0.58 volts. The ignition key must be in the run position for this
measurement.
D - Retighten TPS and recheck voltage. If the voltage is within adjustment range, turn ignition key off, remove jumper
wires and reconnect TPS.
E - Reinstall air cleaner assembly. And cover the exposed wiring with electrical tape to prevent shorting.
9 - Skip this paragraph and go to paragraph 10 if tuning without an oxygen sensor. Using an assistant to monitor the PC
data screen, operate the vehicle smoothly in a safe area. Maintain a constant engine speed and load long enough to
obtain a steady operating condition reading at several engine operating points. Have your assistant monitor and record
the Oxy Comp values at several of these points. After these values are obtained, move the vehicle to a safe location and
begin programming. Go to paragraph 10.
WARNING! Have an assistant monitor the software package or to operate the vehicle during tuning and adjustment.
Failure to pay attention while operating a vehicle is unsafe and can lead to property damage, serious
injury and/or death!
WARNING! Any modifications made to the engine maps should be made with the vehicle stopped in a safe location.
Changes made while the vehicle is in motion could result in a loss of power causing an accident
resulting in property damage, personal injury and/or death.
10 - Retrieve the map from your ECU. Change the fuel as required at the operating conditions from Step 7. After changing
these operating points, continue to "blend" or smooth the fuel curves around these points. Your fuel curve should always
appear smooth. An example of a smooth fuel curve is shown below.
11 - Skip paragraphs 11 and 12 and go to paragraph 13 if tuning without an oxygen sensor. Repeat Steps 6 and 7 at a
variety of speeds and loads until the Oxy Comp value is between "-10%" and "-20% at all operating points on the map.
Go to paragraph 14.
12 - Full throttle fuel has to be set by both driver feel and by observing Oxygen Voltage. Full throttle operation will be open
loop and the engine map should be set up so that the engine runs slightly rich. Good results have been achieved by
Holley by setting full throttle fuel to obtain an Oxygen Voltage of 0.85 volts during full throttle acceleration. Any Oxygen
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