Results 1 to 3 of 3

Thread: Car tuned, runs great, idles like stock. Turn on A/C= :-(

  1. #1
    Senior Member ArKay99's Avatar
    Join Date
    Apr 2004
    Posts
    112

    Default Car tuned, runs great, idles like stock. Turn on A/C= :-(

    Car is a C5 2000 FRC. AFR 205's milled .024, 224/228 .581"/.588" 114lsa +1. LSX90 & LS2 tb. Tuned using PLX AFR. First in SD, then cal'ed the maf, did idle transition, and IAC effective area. Added 2 degrees of timing at idle. The car idles like it did stock, maybe even a little better. LTFT's are between -1 and -3. Then when the A/C is turned on LTFT's go to -8 to -10, MAP goes from 50kpa to 58kpa and idle gets rough. Also, the car won't stay lit from a cold start unless you keep the throttle open with your foot for the first 10-15 seconds. We also did an idle re-learn with the A/C on and that didn't help.
    I am thinking of taking the 1200 row between 45kpa and 60kpa down a few percent at a time until this clears up. AFR is measuring 14.7-14.8 when this happens, but it smells rich.
    In LS1Edit there is a variable that added a pre-determined amount of air in g/s when the A/C is turned on. I can't find it's corresponding parameter in EFILive. Is it there? Any ideas on getting these last two problems to leave? Should I re-do the idle transition?

  2. #2
    Lifetime Member
    Join Date
    Jul 2004
    Posts
    640

    Default

    Searched for "air condition" and found Engine Calibration->Idle->Desired Idle Speeds. See if that's not what you're looking for.

    Ira

  3. #3
    Senior Member ArKay99's Avatar
    Join Date
    Apr 2004
    Posts
    112

    Default

    Well, all we did was go to Engine Calibration -> Idle -> Parameters. We set Idle Learn A/C Limit High to 6.00 and Idle Learn A/C Limit Low to -6.00. And the car dialed right in. Now it idles really nice, with both the A/C on or off.

Similar Threads

  1. Replies: 2
    Last Post: April 1st, 2009, 11:58 AM
  2. CLSD tune runs great 30 min later rich at idle
    By louis in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: October 6th, 2007, 11:57 PM
  3. Idles/drives great, stalls in reverse
    By SSpdDmon in forum General (Petrol, Gas, Ethanol)
    Replies: 3
    Last Post: August 8th, 2006, 07:58 AM
  4. AC on and it idles at 3000+ WTH?
    By Darkness in forum General (Petrol, Gas, Ethanol)
    Replies: 23
    Last Post: June 12th, 2006, 01:46 PM
  5. Idles fine till I turn on AC
    By skippy in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: June 8th, 2006, 03:02 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •