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Thread: VX Start-Up Idle Issues

  1. #1
    Member Since
    Feb 2015
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    2001, Blk, VX, 0592
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    VX Start-Up Idle Issues

    I could sure use some help to figure out what is causing my vehicross to have problems at start-up. When I go to start me vx the idle goes up around a 1000 rpm then drops to 400-500 rpm - sometimes surging between 500 and 800 rpm, but will most likely just die unless I give it a little gas to catch it.
    This problem is always worse after it has been driven and up to temperature. I am not sure why it worse when the engine is hot. I have put new spark plugs in it, cleaned the throttle body, new IAC valve motor, TPS new, and a new ECT sender. None of these has corrected the problem. Hoping someone has experienced this problem or knows what I should do next. Thanks,

  2. #2
    Member Since
    Mar 2015
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    FPR. Just had mine replaced, and that fixed the hard-start issue, and the idle seems to be smoothed out too. I'd start there.

  3. #3
    Member Since
    Feb 2015
    Location
    2001, Blk, VX, 0592
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    Thanks - I will check into it. Do you have any idea if the FPR can be affected by heat/temperature? Because my problem worsens after the vehicle has been driven and the engine and/or engine compartment is hot/warm.

  4. #4
    Member Since
    Mar 2015
    Location
    0616
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    I don't know specifically, but that seems to mirror my issues. Warm start was always a bit harder than cold start.

  5. #5
    Member Since
    May 2015
    Location
    2001,white,ironman,0877
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    I had the same problem and it was my MAF sensor. I replaced it and she idles perfect. 😃

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