how to reset the idle?

Discussion in 'Gen 1 & 2 - Guides (For How-to guides, NOT how-to ' started by rktmn, Apr 30, 2003.

  1. rktmn

    rktmn SHO Member

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    I have done several searches on how to reset the idle on the MTX, but I cannot find the procedure. I even looked in Shotimes.

    Found something on turning the lights on and off, but I coul not find the complete procedure.

    Can someone link me to it?

    Thanks.

    Jose
     
  2. sdpatt

    sdpatt Sr. SHO Engr.

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    Search keys: idle speed reset procedure

    NOTE 1: The Ford owner's manual directs that the idle program be relearned following any service when the battery has been disconnected. To do this, it states that the engine should be started and allowed to idle for the (approximately) 70 seconds without touching the gas pedal. Adding the accessory loads ensures that the EEC and IAC valve can accommodate the additional air flow requirements and still maintain the programmed idle speed.

    NOTE 2: It is preferable that the car be driven immediately after setting the idle programming. While driving, allow the coolant temperature to rise to the normal range and run the car through its entire performance range.

    Idle Speed Program Reset Procedure
    -----------------------------------------
    1) Disconnect the negative battery terminal.
    ....Optionally, disconnect the keep alive memory (KAM) connector in the small
    ....wire also landed to the negative battery terminal.
    2) Wait at least 30 seconds.
    4) Reconnect the KAM connector or negative battery terminal.
    5) Start engine normally (never press the gas pedal).
    6) Allow the idle speed to settle for at least 30 seconds.
    7) Within 70 seconds of starting the engine, concurrently apply all accessory loads.
    ....a) Climate control to MAX A/C.
    ....b) Headlight switch ON, brights ON.
    ....c) Turn steering wheel slowly ~1/4 turn side to side.
    ....d) Press brake pedal.
    ....e) ATX SHOs only: shifter to DRIVE.
    8) Do not turn off engine for at least 5 minutes.
     
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  3. rktmn

    rktmn SHO Member

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    Thanks Scott.

    I'll give it a try.

    Jose
     
  4. fogsho

    fogsho SHO Member

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    try cleaning the throtle body, it has a pair of little holes inside clean them good, it worked for me.
     
  5. frosty the sho man

    frosty the sho man SHO Member

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    There's a procedure in the Ford emissions book for setting the base idle too.
     
  6. sdpatt

    sdpatt Sr. SHO Engr.

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    There is, but you should never have to adjust the base idle speed.
     
  7. frosty the sho man

    frosty the sho man SHO Member

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    Unless the previous owner played with the adjusting screws! :)
     
  8. Axianator

    Axianator I am a banana!

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    FWIW, the 10 minute battery disconnect wait time is completely unnecessary. KAM contents should be destroyed or corrupted within a few seconds of power being interrupted to the EEC. There is no need to "hold the brake pedal", "turn the headlights on", or "wait at least half an hour so that the computer is drained" as popular thought has dictated for so long. All you must do to ensure KAM erasure is disconnect your negative battery terminal for at least 30-60 seconds and you're good to go - any longer than that is unncessary. You may also use the PCM's black grounding plug on the passenger-side strut tower as a substitute, if you wish.

    Just a little FYI for all the previously mis-informed folk out there. ;)
     
  9. BlownByU

    BlownByU SHO Member

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    So what's the big benefit of resetting the idle correctly? I never do and my car seems to run pretty good for the most part :D
     
  10. DigDeez

    DigDeez SHO Member

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    Allot of times when I'm trying to reset the idle, it just doesn't work. Yesterday, I put on another new TPS, and my idle seems to be where it should be.
     
  11. Axianator

    Axianator I am a banana!

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    All it does ("it" being "resetting the idle") is clear the data that is stored in the Keep Alive Memory (KAM) area of the computer, such as short and long-term adaptive fuel trims, ISC adjustment values, etc. Doing this is most beneficial for people who are (re)installing a chip with a different calibration onto their computer - cleaing the KAM of it's stored values will help the computer to start with a "clean slate", so to speak, rather than back-tracking from the values that were previously stored in it's memory. :)
     
  12. SASHO91

    SASHO91 Zoom Zoom

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    this kinda goes along with this thread. at what rpm does yalls shos idle at. mine idles at 900 to 1000. just curious. :D
     
  13. Axianator

    Axianator I am a banana!

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    Base idle for all V6 MTX computers from the factory is 800 rpms. ;)
     
  14. PAracer

    PAracer SHO Member

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    Is there any reason to unplug an aftermarket chip like an LPM when resetting the idle? Also, is it really that important to do this when installing a freshly burned chip?
     
  15. Axianator

    Axianator I am a banana!

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    No and yes, respectively. ;)
     
  16. autobahnsho

    autobahnsho SHO Victim

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    They are all supposed to idle at 800rpms.

    After I replaced the Crank position sensor, (and replaced the timing belt) the tach was always around 100 (1000) rpms too high,
    compared to before the sensor konked out.
     
  17. shojuan

    shojuan SHO Member

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    The tach isn't known to be completely accurate.
     
  18. Jason Bowles

    Jason Bowles Curious Kid

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    This might go along with this thread

    I have a 93 Sho and I was wonder what the rev-limiter is supposed to be set at on this generation SHO. Mine is at 3800 and I've been told thats quite low.

    Please Help
     
  19. Jaxon

    Jaxon SHO Member

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    The rev limiter hits at 3800? How do you ever get to the secondaries???
     
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  20. Jason Bowles

    Jason Bowles Curious Kid

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    Secondaries

    It is my understanding that the rev limiter is only for when the car is in neutral. When in drive it has no problem shifting right before redline while punching it. The only reason I ask is cause I was giving a truck a jump and I happened to hit 3800 RPMs and the rpms jumped as the car shook. I was concerned so I asked around what the hell it could be and they told me it was a rev-limiter and they've never seen or heard of one being so low. I'm not a mechanic and I dont race cars so I'm pretty cluess when it comes to cars - it's just nice to know the power is there when you need it.

    Thanks

    Jason
     

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