Ac on, car stalls.

Discussion in '94-95 5.0 - Specific' started by the5.ohh, May 25, 2016.

  1. the5.ohh

    the5.ohh Legend

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    Long story short... trickflow hci, 24# injectors, matching 76mm maf, egr delete, smog pump delete, walbro 255 lph fuel pump, 70mm tb, all new and upgraded valvetrain components. Anywho.. car doesn't have a tune, I'm on a waiting list to bring it. Turn my AC on at a light, and idle drops and immediately stalls. Turns right back over but if the ac is still on, shuts off. Now.. if I rev it up and take off, it'll buck and shake a bit all of first gear. Turn the ac off, and she runs perfectly. Bad iac? Maybe a tune will rectify the issue if it had been caused by the HCI swap and lack of tune.
     
  2. lutter94

    lutter94 Well-Known Member

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    I would tune it before throwing parts at it.
     
  3. ttocs

    ttocs Legend

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    your nuts! Start at the back at the tranny and work your way forward. Replace everything!

    You can test teh IAC with a volt meter to be sure its moving. Could be as simple as a vac line as well
     
  4. the5.ohh

    the5.ohh Legend

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    Hahaha I have like two spare IAC's lying around. I'll swap it, and check the vacuum lines
     
  5. ttocs

    ttocs Legend

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    easiest way to check vac lines.

    [video=youtube;rumgJ5UBpCw]https://www.youtube.com/watch?v=rumgJ5UBpCw[/video]
     
  6. TrickVert

    TrickVert Member

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    If you unplug your IAC and the idle drops, it's a good bet it's working as designed. I'd suggest performing a base idle. Also, cammed cars typically require a bit higher idle than stock. The 94/95 computer doesn't like H/C/I changes. Can you fiddle around and get it to run OK? Yes. Will it be optimal, no.

    Andy