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Thread: Engine vibration at stop light

  1. #1
    Join Date
    Nov 2012
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    new jersey
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    58
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    Engine vibration at stop light

    I have an engine vibration when in gear at idle (at stop light) if I put it in neutral almost all the vibration goes away. Once I'm driving there is no vibration, engine feels and performs normal. I have 96K on it. Please Help before I bring the car to someone.

  2. #2
    Join Date
    Oct 2014
    Location
    Charlotte, NC
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    Quote Originally Posted by metro1998 View Post
    I have an engine vibration when in gear at idle (at stop light) if I put it in neutral almost all the vibration goes away. Once I'm driving there is no vibration, engine feels and performs normal. I have 96K on it. Please Help before I bring the car to someone.
    My car is coming up on 48k miles and recently had the original plugs changed out. Compression checked out. Slowing to a stop or stopped I have to check the tach to make sure Marauder is still operating - it's that smooth (and quiet). Has a 'nervous idle' (slight shaking) in Park or neutral but firing evenly. Motor purring at tail pipes. Marauder does operate and idle better with 'no ethanol' gasoline. Ran well when I bought it at 39k miles but noticed that after 47k miles the idle quality was deteriorating - not as smooth as before - no codes or CELs. New plugs restored idle and lost performance I wasn't even aware was missing as the process is very gradual. Let us know what you find.

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  3. #3
    Join Date
    Sep 2018
    Location
    Carrollton, TX
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    37
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    150
    I had surging idle at stop with the AC on and changed out the throttle position sensor and idle air control valve. Fixed it right up. I kinda just threw parts at it though so you may not need both, hell you may be able to change plugs like suggested above and be good
    2003 Mercury Marauder 300A
    Former Owner: Joe Walsh

    2015 Mustang GT PP
    Guard Metallic Exterior

    2018 F-150 King Ranch
    2WD, 3.5 EcoBeast

  4. #4
    Join Date
    Sep 2005
    Location
    Buffalo, NY
    Age
    59
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    2,655
    An underperforming coil can cause that. I had a slight miss at idle at about that milage. I replaced all of my COPs and plugs. I'm supercharged and drive it hard so I just upgraded everything at once.
    Built: 3/16/2004
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