Idle probs

Discussion in 'General Discussion' started by Colton Dye, Apr 15, 2019.

  1. Colton Dye

    Colton Dye New Member

    I've noticed when I start my truck up(98 4.0l v6) that itll fluctuate from 1200rpm to 600rpm, and it will do this until it gets warm enough to stay at 600rpm. Any ideas on why it does this?
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  3. OldTimer

    OldTimer New Member

    Check your ETC. I wonder if it's 'shorting' showing a really (-10F) cold engine, then it improves when it gets a bit warmer. Is that truck equipped with an EGR system? My daughter's Taurus would rev up n down until it warmed up a bit, vac leak in the EGR system.
  4. RangerAl

    RangerAl Member

    Idler air control, the cylinder thing on top of the throttle body. Its get dirty and sometime you can get away from cleaning it. I would just replace it.
  5. trickingiphone

    trickingiphone New Member

    Check your ETC. Is he shorted?

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