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Park/Neutral Position Switch & Idle Speed question

Discussion in '4 Cylinder' started by RichP, Nov 19, 2009.

  1. Nov 19, 2009 at 4:38 PM

    RichP [OP] Dedicated Toyota Buyer

    Jul 11, 2009
    Tacoma, WA
    '10 Tacoma Access Cab SR5
    Hi - I'm chasing down a rough idle problem with my '97 2.4/AT/105k . The engine runs fine but about 10 seconds after you come to a stop the idle speed drops and the engine shakes noticeably.

    If I pop it into Neutral and then back into Drive the idle is smooth for about - you guessed it - 10 seconds.

    I've tried the usual tricks - check vacuum hoses (all good), new PCV valve, Seafoam through the brake booster hose/oil change/new plugs, cleaned the throttle body. None of it helped.

    What I'm trying to figure out is what the ECU is telling the EFI to do after the truck comes to a stop. If I can do that maybe I can figure out what to do next to fix this problem.

    I've pored over the FSM but it's more of a troubleshooting guide and doesn't delve into how the components work together.

    Any help on chasing this one down would be greatly appreciated. Thanks!

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