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Thread: Shudder

  1. #1
    Join Date
    May 2018
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    Winfield, MO USA
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    Shudder

    I'm having an issue with my 2001 Grand Marquis LS. While I'm on the highway from 50 mph on up if I come to a slight uphill where you have to give just a little more throttle to maintain speed I get a wicked shudder. If I hammer on it the shudder goes away. If I let off the shudder foes away. It also seems to happen in top gear as the torque converter locks up.

    Does anyone have any idea what's causing this and how I can fix it?

    The car was a 1 owner car. A school teacher that drove it from Jerseyville, IL to St. Louis, MO. It has 157,000 miles on it and is in great shape. I can't fathom an older school teacher running the car hard so I don't think it's transmission damage. Thinking maybe wear or needs a fluid change.

    I'm open to suggestions. Any help would be appreciated.

    Thanks in advance,
    Aaron

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  2. #2
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    I would suggest changing coils, plugs and checking the mass air flow sensor. And let the trouble shooting begin

    Righteous Indignation
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  3. #3
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    Could also be an engine misfire, plug or coil. If it is the trans has it been serviced ?
    73TORINO SPORT 112K M. BOUGHT NEW
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  4. #4
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    I've only had the car for 4 months. The CarFax report is immaculate. The original owner was all over the service intervals so I'm almost sure it's been serviced. I'm just not sure how long ago. I'd have to go back and look. I wondered about a misfire but since I'm new to Ford and Mercury (Chrysler guy) I wasn't sure. Do these cars register a cylinder misfire? I haven't ever had a check engine light come on.

    A tune up is in my plans but was waiting until next month. Had some unexpected expenses this month.

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  5. #5
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    MIsifre does not always register a check engine light, I believe it generally a repeat process where the same cylinder must misfire 'x" times over "x" time for it to turn on the CEL. Is the trans fluid correct level, clean and bright red? if it is dark, burnt smelling, past due for service. The factory tuning on these cars (cv, mgm, marauder) is based on gas mileage so the trans has poor shifting parameters by getting to OD asap then hunting for which gear to be in based on rpm etc..Torque converter shudder can happen. Often a fluid change helps, scan for codes even if one is not showing, check plugs, cops..especially if original. dirty MAF, vacuum leak.
    2004 SB Ported Trilogy 48
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    Thanks to Marty O for his help in updating this car.

    R.I.P.
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  6. #6
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    One other thing I've noticed happening to mine and my buddy's car is the IAC howl. They're both the same year and roughly the same mileage. The research I've done says it's hard to get that to go away permanently. It does it while cruising on the highway, sitting at stoplights, and at startup. When it's howling the engine runs at a higher RPM. Could this be causing issues as well?

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  7. #7
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    clean the iac or change it, they are not expensive..they get dirty with carbon
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  8. #8
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    May 2018
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    Quote Originally Posted by RubberCtyRauder View Post
    clean the iac or change it, they are not expensive..they get dirty with carbon
    Thank you for all your help. I love this car! I just need to get these couple bugs worked out and she'll be good to go.

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  9. #9
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    Flush the transmission....
    My Mom's 1996 GM had the same problem...turned out to be the OD function in the transmission. It had just under 90,000 miles IIRC.
    We changed fluid/flushed the trans and the problem was gone....drove smooth as glass after that.
    Last edited by Joe Walsh; 05-25-2018 at 01:37 PM.
    2020 Ford Ranger STX DFI Turbo 2.3L 10 speed Auto
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    1985 Mustang GT 5.0 Hatchback 4bbl 5 speed manual (525 HP 363 Dart block/AFR heads with Magnum 6 speed in the works)
    1984 Mustang GT 2.3 Turbo Convertible FI. 5 speed manual
    1966 427 Cobra (ERA) 468 all Aluminum FE 2x4bbl 5 speed manual

    SOLD : 2003 Mercury Marauder FI. 4 speed Auto
    w/Crower Cams & Springs, +1mm SS valves, mild port job on the cylinder heads.
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  10. #10
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    Turn your OD off and test that theory.

  11. #11
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    Torque Converter shudder.......add one 4 ounce bottle of FORD Friction Modifier......the smelly one for the rear end LSD.......if it goes away you are fine and can do a flush later......it's the same additive that comes in Mercon V fluid!!

    This has worked for me from the Mid-90's in every CV I've had and I had 6 of 'em and ONE GREAT MARAUDER....used it in it too!!
    No Marauder

  12. #12
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    Thanks guys... I'll try a flush next week. Today I fixed the annoying intake howl.

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  13. #13
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    With the OD off it still does it as the converter locks and unlocks.
    Quote Originally Posted by BLACKMARAUDER04 View Post
    Turn your OD off and test that theory.
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  14. #14
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    I'm going to buy a 4 ounce bottle of friction modifier today and give that a shot. I'll flush the trans next month and add another 4 ounce bottle. I want to try to make this tranny last.

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  15. #15
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    Go for it......it will not hurt a thing and hopefully fix your problem!!

    WARNING......DO NOT SPILL ANY...IT STINKS FOR A LONG TIME!!
    No Marauder

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