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  #1  
Old 05-25-2018, 05:19 AM
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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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Old 05-25-2018, 05:28 AM
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I would suggest changing coils, plugs and checking the mass air flow sensor. And let the trouble shooting begin
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Old 05-25-2018, 05:30 AM
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Could also be an engine misfire, plug or coil. If it is the trans has it been serviced ?
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Old 05-25-2018, 05:45 AM
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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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Old 05-25-2018, 05:54 AM
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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.
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Old 05-25-2018, 06:00 AM
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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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Old 05-25-2018, 06:11 AM
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clean the iac or change it, they are not expensive..they get dirty with carbon
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  #8  
Old 05-25-2018, 06:23 AM
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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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Old 05-25-2018, 11:44 AM
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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.
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Old 05-25-2018, 01:12 PM
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Turn your OD off and test that theory.
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Old 05-25-2018, 02:37 PM
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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!!
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Old 05-26-2018, 06:42 AM
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Thanks guys... I'll try a flush next week. Today I fixed the annoying intake howl.

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Old 05-26-2018, 07:07 AM
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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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Old 05-26-2018, 09:55 AM
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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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Old 05-26-2018, 12:52 PM
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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!!
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