Thread: adjusting BOTH idle and air fuel ratio via AEM EMS how hard?

ok i have had this problem for like ever it seems and i am just now seeming to get the things i need to get it fixed. i have a macbook, i am running windows xp through boot camp and i have found a serial to usb adapter to run the program on my macbook. so that was my delima and now thats fixed.

my question is how do i go about adjusting the base idle through AEM EMS. its a bypass system which means i dont need to go through all the hassle like unplugging the tps, reving up 3 times, turn on and turning off the car and all that, i can do it straight up through the aem software right?

ok well if so how user friendly is it to adjust the idle? right now i get a idle of like 1400rpm and want to turn it down to around stock 750 and then compinsate around 150rpm for the camshafts so like 900rpm would be PERFECT.

ive never gone into the aem ems and adjusted anything as of yet, the air fuel ratio at idle also needs to be adjusted how hard is that?

the reason i want to do it via laptop through aem is becuase my car NEVER would go into timing mode the way it should NEVER, so if this bypasses it than i will just do it that way.

ALSO is it possible to adjust the ignition timing through aem? becuase i know at idle it will giveyou the ignition timing value. so is it possible to loook at the idle ignition timing value and then adjust the timing to the setting i want by monitoring the vlue on the screen? or am i off?

if someone could let me know if im being vauge as to how to go about adjusting these things or if they basicly use a bypass and they adjust all settings through the aem ems which eliminates the need for doing all the PITA stuff that you have to do to normally adjust, idle,timing,ect

anyone?

an help before i attempt it myself?

Dude, you gotta chill out! People aren't on here 24/7! It hasn't even been a day and you have bumped 3 times!

Brent

im just trying to get some imput before i attempt it, sorry im realy eager to do this as i have had the problem for a while and i didnt have a laptp to get into this stuff till recent

The first step before tuning the IAC system is to determine the direction of the motor.
The language of the IAC motor is in percentage. This is not percent open or percent
of airflow, it is rather the full-scale percentage of the motor where 100% may be fully
closed or fully open. Do not assume that a larger idle percent gives a higher idle
speed. Some factory units actually decrease Engine RPM as idle percentage
increases. It is very easy to determine which way your specific IAC system works.

· Open AEMPro and connect to the EMS.
· Confirm that the throttle position is set properly (closed < 1%, WOT > 95%).
· Confirm the AFR or that the vehicle has sufficient fuel for idling and that the
vehicle is at the normal operating temperature.
· Open the Idle Template and set Idle FB Below rpm to a conservative
3,000RPM and set Idle FB Above rpm to 400RPM. Set both Idle On If TP
Less and Idle Off If TP Over to a conservative 5%.

These settings will activate the idle circuit whenever the engine RPM is below 3,000
RPM and the throttle is below 5%. These settings are not necessarily drivable but
they will allow the vehicle to idle on its own so you can begin tuning.

· Start the engine.
· Get the vehicle to idle. This may require creative throttle movements to
stabilize the idle until it catches itself.
· Confirm that an increase in the Idle% vs Target Table will increase RPM
rises.
· If RPM decreases, select the Idle Invert option in the Advanced Idle
Template.
· Shut off the engine.

Now that you know how the IAC motor responds, you can start setting up the idle
tables and idle options.

· In the Advanced Idle Template, set the option Idle FB Minimum to -50%
and Idle FB Maximum to 50%.
· Set the options Idle FB Dead Band+ and Idle FB Dead Band- to 0.
· Open the Idle Template and set the entire Idle Target Base table to
3,000RPM.
· Start the engine.
· After a few seconds, confirm that the Idle Target parameter is 3,000RPM (if
not zero-out all.
· Add or subtract idle percent from the Idle% vs Target Table until the Idle
Learned Value parameter is 0% (you may notice that the idle motor will not
rev the engine this high but that is common).
· Drop the Idle Target Base table to 2900RPM.
· Add or subtract idle percent from the Idle% vs Target Table until the Idle
Learned Value parameter is 0%.

AEM EMS User 87 Guide V2.0 2003 AEM

· Drop the Idle Target Base table to 2800RPM.
· Repeat this process for every 100RPMs until 500RPM is reached.
· Set the Idle Target Base table to your desire.

It is a good idea to set the Idle FB Minimum option to a small feedback percentage
to keep the engine from stalling (5% is typical). The Idle FB Maximum can be set
high to band aid tuning flaws (15% is typical). The Idle FB Dead Band- option is
typically set at -25RPM while the Idle FB Dead Band+ is typically set at +50RPM to
keep the idle steady. A typical Idle FB Below rpm is 1700 which keeps the idle
motor from trying to idle at slow vehicle speeds. Set both Idle On If TP Less and
Idle Off If TP Over options 1% higher than the Throttle parameter when the engine
is running and the throttle is at rest.

holy crap is it really that dificult, i can barely read that lol

on the other hand, coach can i adjust the ignition timing through the ecu?

OK, here is the easy way!

Turn off all Idle FB and O2 feedback and zero out any of the advanced Idle tables. Set the idle FB minimum to 400 and the Idle FB maximum to 400 also to turn off idle feedback. Then, set the idle target speed table (whole table) for whatever idle RPM breakpoint that you wanted to adjust (start at 1800RPM and work your way down by 100 RPM increments). Then adjust the idle% vs. target RPM at that rpm breakpoint and adjust the percentage to get the Idle Learned value to around -2 or -3. Do that for each RPM breakpoint in the table and it should be fixed.

Brent

ok that is definitly easier lol.