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#4112386 - 06/13/21 05:06 PM 2006 p71 stutters after coasting.
dragon7a Offline
Stranger

Registered: 06/07/21
Posts: 5
Loc: sweden
i have a p71 2006 and sometimes at even speed around 80km/h my car starts to stutter and jump up and down 200rpm if i let go of that gas or give it more throttle it works fine again this happens once every 2days.This also happons almost everytime i go of the throttle completly and coast arond 70-90km/h and when i go on the throttle again the car revs around 200rpms before it takes of.
is it my transmisson? torque converter? or something else?

the car dosen't throw any codes. i have done a pandrop and the oil looks good.

my personal guess is the torque converter since the car dosent do it in higher speed.

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#4112388 - 06/13/21 06:28 PM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
Big_Pimpin Offline
Rookie

Registered: 11/12/20
Posts: 57
Loc: NC
Welcome to the forum.I am sure some with more experience than me will chime in eventually.
_________________________
2009 Grand Marquis. Dual exhaust w/x-pipe and Dynomax mufflers,3.55 LSD with aluminum driveshaft, ADTR intake pipe and ported plenum with modified airbox, MO's tune.

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#4112408 - 06/14/21 12:43 AM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1770
Loc: SoCal High Desert
What happens if you manually turn the O/D off? Any change in 3rd gear only?

With that small of a RPM drop, it sounds like the torque converter lock-up clutch is going in and out of engagement, or slipping very badly.
_________________________
'95 P71, 5xx,xxx miles, Rebuilt tranny, 2.73. Lives as a cab, and will die as a cab. (Died-FrontEnder)
'96 P71, 640,xxx on original drivetrain. (Now parts car - T-bone & roll)(You should see the roof - A,B & C-pillars chopped on driver side)
New to list: '96 MGM (Nice! @ 35x,xxx), '97 CV P71, '98 CV P71, '00 CV P71, 01 P71 (2 of 'em) '03 CV P71 (Nice so far) (All Ford Zinc Yellow w/Black decals & trim) And the list is growing...........
Taxicab mechanic: I HATE DRIVERS!

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#4112424 - 06/14/21 11:46 AM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7613
Loc: MA
Agree w/TheShadow. It does in fact sound like TCC shudder. The fix is to change the transmission fluid, taking care to use only an approved Mercon V product.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4112450 - 06/14/21 02:17 PM Re: 2006 p71 stutters after coasting. [Re: TheShadow]
dragon7a Offline
Stranger

Registered: 06/07/21
Posts: 5
Loc: sweden
its the same if i have the od off or on

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#4112454 - 06/14/21 02:18 PM Re: 2006 p71 stutters after coasting. [Re: RF_Overlord]
dragon7a Offline
Stranger

Registered: 06/07/21
Posts: 5
Loc: sweden
i will change the transmission fluid this weekend or maybe next weekend . i will post if it helps or not.

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#4112456 - 06/14/21 02:29 PM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1770
Loc: SoCal High Desert
Originally Posted By dragon7a
its the same if i have the od off or on

Yup, TCC shudder...follow RF_Overlord's advice.
_________________________
'95 P71, 5xx,xxx miles, Rebuilt tranny, 2.73. Lives as a cab, and will die as a cab. (Died-FrontEnder)
'96 P71, 640,xxx on original drivetrain. (Now parts car - T-bone & roll)(You should see the roof - A,B & C-pillars chopped on driver side)
New to list: '96 MGM (Nice! @ 35x,xxx), '97 CV P71, '98 CV P71, '00 CV P71, 01 P71 (2 of 'em) '03 CV P71 (Nice so far) (All Ford Zinc Yellow w/Black decals & trim) And the list is growing...........
Taxicab mechanic: I HATE DRIVERS!

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#4112460 - 06/14/21 03:13 PM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7613
Loc: MA
Be advised that depending on how depleted the old fluid is, the effect may not go away immediately. It can sometimes take a short bit of driving.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4112462 - 06/14/21 03:17 PM Re: 2006 p71 stutters after coasting. [Re: RF_Overlord]
dragon7a Offline
Stranger

Registered: 06/07/21
Posts: 5
Loc: sweden
okay thanks for the advice

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#4112504 - 06/15/21 09:15 AM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
Lance01 Offline
Member

Registered: 04/02/18
Posts: 489
Loc: Pa
I have a 2004 and 2 months back I had similar issues but it would occur every few months and I had weird idle issues even though I did everything I could to resolve the issue from the intake manifold up including buying new various sensors.

Not trying to scare you but my transmission finally gave out at 240k so I got a low mileage used transmission installed and a new torque converter and all the idle issues and engine stumbleing are now gone.

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#4112514 - 06/15/21 10:55 AM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
UnkleVic Offline
Rookie

Registered: 07/24/17
Posts: 99
Loc: US Gulf Coast
My 1999 had the shudder until I changed the fluid and filter based on advice from this forum. Don't forget a new filter. Get the correct filter and install it by the book. Mercon V fluid. The pan gasket was reusable but since it was twenty years old I replaced it anyway. Reusable doesn't mean forever.

The shudder was most noticeable in high gear while lightly accelerating up a slightly rising hill. Car fully warmed-up.
_________________________
2009 P71
1999 P73

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#4112528 - 06/15/21 12:37 PM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
TheCableGuy Offline
Over the Hill

Registered: 04/08/19
Posts: 1032
Loc: Far Northwest AZ
I thought that I had TC Shudder for a long time. Happened only when at 40, cruising and then going up an incline. Even after doing the JMod, it never went away. ForScan didn’t show any misfires either. So I figured I would live with it until it just breaks completely.

While doing plugs and coils as PM, that literally fixed the issue.. and my spark plugs were really really toast..

Just saying. My 2 cents.
_________________________
2010 P7B 150K. 11K hours. 3.27, RKE, Cruise, Ported stock plenum, JMod, ADTR sway bar, KYB rear shocks. DIY Headlight harness upgrade, with projector retrofit: Mini H1’s.
2011 Sierra 1500 155K, too many mods to list. (RIP 01-05-2019)
2001 Durango R/T 5.9. 230K. SOLD 5-1-19

They laugh at me because I’m different. I laugh at them because they’re all the same- Heath Ledger


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#4113780 - 06/29/21 03:56 PM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
dragon7a Offline
Stranger

Registered: 06/07/21
Posts: 5
Loc: sweden
hey i just wanted to let you guys know that i flushed my tranny just over a week ago and its so much better now my transmission has never shifted gears so smoothly before. The car still shudders sometimes but not as often and its definetly not as bad as it was before. So now its perfectly driveable and not as annoying as it wa before.

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#4113862 - 07/01/21 10:07 AM Re: 2006 p71 stutters after coasting. [Re: dragon7a]
AlleyG Offline
Climber

Registered: 04/28/14
Posts: 575
Loc: Raleigh, NC
These hold 13+ quarts, so they need at least 10 fresh quarts for best results.

Al
_________________________
2004 CVPI - 85k miles
1997 T-Bird LX - 85k miles
1994 Supra Turbo - 107k miles
Previous Fords:
1988 T-Bird, 1995 T-Bird, 1996 Cougar

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