AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual

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Infinity User Manual

These settings will allow idle feedback whenever the engine RPM is below 3000RPM and the
throttle is below 10%. These settings are not intended to be used after the setup process is
completed, but they should allow the feedback to help the vehicle stay running without holding the
throttle so you can begin tuning the idle base tables.

8. Start the engine and get it to idle. This may require creative throttle movements to

stabilize the idle until it catches itself.

9. Confirm Lambda is measuring safe values, so the vehicle has sufficient fuel to idle

without stalling but is not running so rich it will foul spark plugs.

10. Make sure that Engine Speed is less than 3000RPM. If not, there may be a vacuum leak.
11. Be sure the throttle pedal is at rest and confirm the ECU's measured Throttle value

displays less than 10%.

12. Confirm that an increase in the IdleBasePosition values will increase engine speed.
13. If RPM decreases when IdleBasePosition increases, change the Idle Airflow Invert

option in the Idle Wizard.

Idle Basic Tuning:

1. After the engine gets up to operating temperature, confirm that the IdleTarget displays

2000RPM.

2. Add or subtract idle values from the IdleBasePosition table until the IdleFB channel

displays between -3% and -8%. Note: If the idle motor does not allow enough airflow to
reach 2000 RPM, try some lower target RPM that can be achieved.

3. Change the IdleTargetTable to 1800RPM.
4. Add or subtract idle percent for the 1800 RPM cell in the IdleBasePosition table until the

IdleFB channel parameter is between -3% and -8%.

5. Change the target value in the IdleTargetTable to 1600RPM.
6. Repeat steps 4–5, adjusting the values in the IdleBasePosition table until the lowest

desired idle RPM.

Now the IdleTargetTable can be set to your desired values for normal operation. Many tuners
increase the idle target by 200–400 RPM when the engine is cold for increased idle stability and
to help the engine warm up more quickly.

It is recommended to set the Idle On Below TPS option to 2–3% higher than the ECU's
measured Throttle position when the engine is running and the throttle is at rest. This will allow
for minor fluctuations in the throttle signal without disabling idle feedback.

Typical values for Idle On Below RPM are 1500–2000 RPM, so the feedback will be active at
high idle target RPM when coolant temperatures are low, but idle feedback is not active when the
engine is in gear and decelerating.