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  • Odd A/C issue

    On my 95 Aspire, when it is very humid/raining and I have the a/c on, it won't accelerate hardly at all, just seems to bog down. When I turn off the a/c, it accelerates fine. It does not exhibit this issue when humidity is average or low.

    Any thoughts?
    90 Festy (Larry)--B6M (Matt D. modified B6 head), header, 5-speed, Capri XR2 front brakes, many other little mods
    09 Kia Rondo--a Festy on steroids!

    You can avoid reality, but you can't avoid the consequences of avoiding reality--Ayn Rand

    Disaster preparedness

    Tragedy and Hope.....Infowars.com.....The Drudge Report.....Founding Fathers.info

    Think for yourself.....question all authority.....re-evaluate everything you think you know. Red-pill yourself!


  • #2
    Weird,
    -Greg
    Euro-bprt...WORLDS FASTEST FESTIVA !!! 11.78@115.9
    BP, G trans, Megasquirt/ 550cc inj. t3/t3 (tbird) Garrett, REAR TURBO!!!! AND AC!!!!
    Redneck Engineer
    FOTY - '09
    5x Festiva Madness Attendee...FM 3,4,5,6,8
    http://www.youtube.com/watch?v=LpCZ7...9Pwqw-oe8s2OYQ
    http://www.youtube.com/watch?v=vU_eX...9Pwqw-oe8s2OYQ

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    • #3
      I just noticed tonight that when I accelerate from a stop with the A/C on, my wideband is reading in the 14s-15s at idle, then drops to the 19-20 range, very lean, as I accelerate. It barely accelerates at all, then at about 4300 rpm, it will take off like a rocket as it gets back to the 14s or richer. This problem just started happening a couple months ago (when I started using A/C). I'm thinking some sensor is at fault. I'm wondering if it has to do with Matt D's header; i.e., the A/C kicking in, with the different flow characteristics of the header, confuses the simple computer we have. 1995 OBD-1 Aspire. (But frankly, I don't really believe this is the issue; just throwing it out there since the header is a non-stock variable.) I am using the Innovate wideband's heated O2 sensor as the one the computer reads.

      With A/C off, there is no problem at all, it behaves perfectly normally.
      90 Festy (Larry)--B6M (Matt D. modified B6 head), header, 5-speed, Capri XR2 front brakes, many other little mods
      09 Kia Rondo--a Festy on steroids!

      You can avoid reality, but you can't avoid the consequences of avoiding reality--Ayn Rand

      Disaster preparedness

      Tragedy and Hope.....Infowars.com.....The Drudge Report.....Founding Fathers.info

      Think for yourself.....question all authority.....re-evaluate everything you think you know. Red-pill yourself!

      Comment


      • #4
        1) While stopped, if you turn on the A/C, does the idle increase immediately? It should.
        2) Does the A/C cycle properly, as it should?
        3) When you floor it with the A/C on, does the A/C clutch release, as it should?
        Last edited by bravekozak; 08-19-2014, 11:39 PM.

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        • #5
          Originally posted by bravekozak View Post
          1) While stopped, if you turn on the A/C, does the idle increase immediately? It should.
          2) Does the A/C cycle properly, as it should?
          3) When you floor it with the A/C on, does the A/C clutch release, as it should?
          1) yes
          2) yes
          3) don't know. I often turn the A/C off momentarily so I can accelerate faster, especially on on-ramps for example.

          Also, when cruising at hwy speeds, there is no problem accelerating. It's only when doing so from idle. Maybe an IAC issue?
          90 Festy (Larry)--B6M (Matt D. modified B6 head), header, 5-speed, Capri XR2 front brakes, many other little mods
          09 Kia Rondo--a Festy on steroids!

          You can avoid reality, but you can't avoid the consequences of avoiding reality--Ayn Rand

          Disaster preparedness

          Tragedy and Hope.....Infowars.com.....The Drudge Report.....Founding Fathers.info

          Think for yourself.....question all authority.....re-evaluate everything you think you know. Red-pill yourself!

          Comment


          • #6
            It must be something else. The only purpose the ECA seves on a carby is to speed up the idle when the A/C is on. There are two ECA pins for an EFI, The other one provides a ground for A/C relay #2. It takes the place of the A/C control amplifier in cutting power to the compressor clutch and condenser fan under heavy load.

            Did you see the recent video link of heating the O2 sensor with a torch to clean it and check response time?
            Last edited by bravekozak; 08-20-2014, 02:37 PM.

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            • #7
              High humidity air planes don't fly so good , engines not as good because of less dense air, you must be close but not quite too lean with low rpm high power needed situations. Bad air puts you over the limit..look at AFS inputs and try tweaking the spring tension a couple gear cogs weaker. Mark where you are at in case you slip! If you are using speed density or hot wire inputs then try a known good sensor.

              It wouldn't hurt to eyeball the ground paths for the ac clutch and your computer stuff. Better yet move to the mountains!!
              Reflex paint by Langeman...Lifted...Tow Rig

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