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Idle inconsistency

Posted by RJ_IS_BATMAN, Aug 1, 2020

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    RJ_IS_BATMAN Proven Member

    Joined May 7, 2020
    Ontario, California
    Hey Everyone.

    So I have been driving my 98 eclipse with a 420a in it for a few days now and the idle is so inconsistent. It hasn’t shut off or stalled out on me but some days it hasn’t problems and says around 900 rpm without ac 1k with the ac turned on. Other days it wants to stay at 1.5 to 2k with out without ad. And days like today I went to start it and it was surging from 500 to 1.5k. I attached a vid to show what it did today

    here’s what I’ve done so far.
    New ngk spark plugs
    Ngk spark plug wires
    Msd ignition
    Oil change.
    Coolant flush
    New ac/ps belt
    New battery

    Any thoughts?

    Street Build 295  22

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
  2. luv2rallye

    luv2rallye DSM Wiseman

    Joined Jun 7, 2003
    Minneapolis, Minnesota
    Check for air leaks in air intake couplings, intake manifold leaks, and throttle body shaft seals leaking air. Can spray WD40 or soapy water on areas to test (engine rpm will change if leak).

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
  3. luv2rallye

    luv2rallye DSM Wiseman

    Joined Jun 7, 2003
    Minneapolis, Minnesota

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