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2003 Grand Caravan makes noise when engine is turned off

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    #1

    2003 Grand Caravan makes noise when engine is turned off

    Hi, I was not sure whereto post this at GMN. I do believe someone here will know the noise. Awesome mechanic here. Here is a link to the short video on youtube

    http://www.youtube.com/watch?v=b4xHg...ature=youtu.be

    what do you guys think it may be?

    thank you,
    Mike

    PS it is my wife's daily driver.
    I only drive FORD and MERCURY cars when I can.
    90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
    90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
    91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
    70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original
    Tags: None
    #2
    should be in off topic...

    interesting noise... almost sounds like a loose engine mount. Though I might investigate in cams and see if any of the cam towers/braces are cracked.

    What engine does it have? There's a few other guys here that know more about mopar stuff than I do.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

    Comment

      #3
      My fist guess would be something in the alternator or maybe having to do with the crankshaft pulley area, maybe something in or near the timing belt.

      But why not use a mechanics stethoscope to pin point the problem more accurately. You can "borrow" one at Advance and Auto Zone parts stores with a deposit. Those things work great!!

      Comment

        #4
        My library has alldata I can look it up prob on monday
        89 townie, mild exhuast up grades, soon to have loud ass stereo....

        Comment

          #5
          Sorry, I could not find the Off topic area. The engine is a 3.3 liter from 2003. I will check the motor mounts tomorrow. I remember the 70's cars with a bad motor mount would have the radiator fan hitting the fan shroud. Almost sounds the same. This sounds like it is coming from the engine itself. Almost like the starter may be re-engaging upon shut down even though the flywheel looked good when removing the inspection plate. The starter would be on the back of the engine though. The sound seems to come from the front of the engine which is the passenger side.The 3.3 is mounted sideways in theGrand Caravan.

          Thanks again.
          90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
          90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
          91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
          70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original

          Comment

            #6
            Best bet is to get a stethoscope and buy your assistant a few beers. I have no fucking clue what that sound could be but there are only so many moving parts at that end of the motor.
            sigpic


            - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

            - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

            - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

            Comment

              #7
              I work on quite a few of these at my job. What you are hearing is the " clutch " in the alternator. It is not a problem per se, but it is annoying as hell. Damned if we know why Mopar designed them like that. It doesn't make any sense to us. We just replace the alternator, as a lot of our group home employees are always complaining about the noise. You try to tell these Hyundai driving idiots that it's normal for these vans, and they look at you like you have two heads.

              MIKE

              Comment

                #8
                absolutely normal Mopar alternator OAD pulley decoupler clutch.
                "clank-clunk" on turn off=normal
                "clank-clunk-screech" on turn off=replace the alternator.

                under rapid deceleration the alternator freewheels and after a while it clanks when the belt stops complety before the alt spins down as the pulley relocks.
                Last edited by bigbeigeboat; 03-06-2012, 10:29 PM.
                You know the car runs well when the only things left to work on are the rear door cigarette lighters.

                Comment

                  #9
                  Thank you PICKUP6772 and bigbeigeboat. Than makes it the third time I heard this. I am sure you guys are correct. I am gonna tell my wife to drive it until it squeals. My thanks again and my thanks to everyone on the board. I belong to a few other forums/websites. The best mechanics are here in GMN!
                  Mike
                  90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
                  90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
                  91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
                  70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original

                  Comment

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