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Old 08-13-2005, 10:01   #1 (permalink)
trotzo@earthlink.net
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'97 4.6 weird shudder

Hi all,
I have a 97 GT 4.6 and I've been having this strange problem. Between
1500 and 2000 rpm's I get this strange shudder which feels exactly like
it would when going over rumble strips in the road. I know it's not
road noise 'cause when it has happened the road has been flat and
smooth, it feels like engine vibrations to me. It always happens when
I'm on the gas at about 1800 rpm's. Anyone else ever had this and what
do I do to correct it?
Thanx-
Trotzo

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Old 08-13-2005, 11:02   #2 (permalink)
John H.
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Re: '97 4.6 weird shudder

On 13 Aug 2005 09:59:01 -0700, "trotzo@earthlink.net" <trotzo@earthlink.net>
wrote:

>Hi all,
>I have a 97 GT 4.6 and I've been having this strange problem. Between
>1500 and 2000 rpm's I get this strange shudder which feels exactly like
>it would when going over rumble strips in the road. I know it's not
>road noise 'cause when it has happened the road has been flat and
>smooth, it feels like engine vibrations to me. It always happens when
>I'm on the gas at about 1800 rpm's. Anyone else ever had this and what
>do I do to correct it?
>Thanx-
>Trotzo


I'm no mechanic, but I'd start looking for something loose that starts vibrating
at a certain rpm. Have you checked it when you're not moving? Have someone get
in and run it up while you're looking around and feeling for something loose.

--
John H.
On the 'PocoLoco' out of Deale, MD
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Old 08-13-2005, 13:01   #3 (permalink)
Backyard Mechanic
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Re: '97 4.6 weird shudder

"trotzo@earthlink.net" <trotzo@earthlink.net> wrote in
news:1123952341.330843.223070@f14g2000cwb.googlegroups.com:

> Hi all,
> I have a 97 GT 4.6 and I've been having this strange problem. Between
> 1500 and 2000 rpm's I get this strange shudder which feels exactly like
> it would when going over rumble strips in the road. I know it's not
> road noise 'cause when it has happened the road has been flat and
> smooth, it feels like engine vibrations to me. It always happens when
> I'm on the gas at about 1800 rpm's. Anyone else ever had this and what
> do I do to correct it?
> Thanx-
> Trotzo
>


AT or MT?

Speedo reading? Or at any speed?
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Old 08-13-2005, 13:01   #4 (permalink)
trotzo@earthlink.net
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Re: '97 4.6 weird shudder


Backyard Mechanic wrote:
> "trotzo@earthlink.net" <trotzo@earthlink.net> wrote in
> news:1123952341.330843.223070@f14g2000cwb.googlegroups.com:
>
> > Hi all,
> > I have a 97 GT 4.6 and I've been having this strange problem. Between
> > 1500 and 2000 rpm's I get this strange shudder which feels exactly like
> > it would when going over rumble strips in the road. I know it's not
> > road noise 'cause when it has happened the road has been flat and
> > smooth, it feels like engine vibrations to me. It always happens when
> > I'm on the gas at about 1800 rpm's. Anyone else ever had this and what
> > do I do to correct it?
> > Thanx-
> > Trotzo
> >

>
> AT or MT?
>
> Speedo reading? Or at any speed?


AT and it seems to do it under light accel, at about 35 mph and above.
It's also an intermittant problem, I tried to "make" it do it but it
does it when it wants to. Since my last post, I discovered that it
comes from under the car, not under the hood. I'm thinking
transmission?
Thanx again....

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Old 08-13-2005, 15:01   #5 (permalink)
Backyard Mechanic
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Re: '97 4.6 weird shudder



>
> AT and it seems to do it under light accel, at about 35 mph and above.
> It's also an intermittant problem, I tried to "make" it do it but it
> does it when it wants to. Since my last post, I discovered that it
> comes from under the car, not under the hood. I'm thinking
> transmission?
> Thanx again....
>
>


Now try it in the D position (or OD off), OD not trying to shift. That is
a symptom of Torque Converter lockup problem

How many miles on the car, when was trans last serviced?

Watch the tach... any noticable slippage?
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Old 08-13-2005, 15:01   #6 (permalink)
trotzo
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Re: '97 4.6 weird shudder


Backyard Mechanic wrote:
> >
> > AT and it seems to do it under light accel, at about 35 mph and above.
> > It's also an intermittant problem, I tried to "make" it do it but it
> > does it when it wants to. Since my last post, I discovered that it
> > comes from under the car, not under the hood. I'm thinking
> > transmission?
> > Thanx again....
> >
> >

>
> Now try it in the D position (or OD off), OD not trying to shift. That is
> a symptom of Torque Converter lockup problem
>
> How many miles on the car, when was trans last serviced?
>
> Watch the tach... any noticable slippage?


I noticed it does it right around the 30 mph range (18-20,000 on the
tach), under slight accel, especially when going up an incline. Seems
like it does it just before the tranny tries to shift to a lower gear,
like when the motor starts to lug. Sounds exactly like going over
rumble strips. 49,000 miles on it, just bought it from a lot so I don't
know when it was last serviced.
thanx again for the replies...

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Old 08-13-2005, 19:01   #7 (permalink)
Claud Spinks
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Re: '97 4.6 weird shudder

trotzo wrote:
> Backyard Mechanic wrote:
>
>>>AT and it seems to do it under light accel, at about 35 mph and above.
>>>It's also an intermittant problem, I tried to "make" it do it but it
>>>does it when it wants to. Since my last post, I discovered that it
>>>comes from under the car, not under the hood. I'm thinking
>>>transmission?
>>>Thanx again....
>>>
>>>

>>
>>Now try it in the D position (or OD off), OD not trying to shift. That is
>>a symptom of Torque Converter lockup problem
>>
>>How many miles on the car, when was trans last serviced?
>>
>>Watch the tach... any noticable slippage?

>
>
> I noticed it does it right around the 30 mph range (18-20,000 on the
> tach), under slight accel, especially when going up an incline. Seems
> like it does it just before the tranny tries to shift to a lower gear,
> like when the motor starts to lug. Sounds exactly like going over
> rumble strips. 49,000 miles on it, just bought it from a lot so I don't
> know when it was last serviced.
> thanx again for the replies...
>

Sounds like what Backyard said. I have driven a couple of vehicles where
this has happened, have had the tranny serviced and things have smoothed
out for awhile.
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Old 08-13-2005, 21:01   #8 (permalink)
Richard
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Re: '97 4.6 weird shudder

I'm also with Backyard. Classic torque converter shutter. Look up TSB
98-8-7. The fix may be inexpensive but read the TSB before taking it to a
shop as they may have other designs.

--
Richard

'94 GT 'vert
Under Drive Pulleys
Transgo HD2 Reprogramming Kit
High Stall Torque Converter
4:10 Gears
Gripp Sub Frame Connectors (welded)
FRPP Aluminum Drive shaft
FRPP M5400-A Suspension
Laser Red

"trotzo" <trotzo@earthlink.net> wrote in message
news:1123966885.011197.246630@z14g2000cwz.googlegroups.com...
>
> Backyard Mechanic wrote:
> > >
> > > AT and it seems to do it under light accel, at about 35 mph and above.
> > > It's also an intermittant problem, I tried to "make" it do it but it
> > > does it when it wants to. Since my last post, I discovered that it
> > > comes from under the car, not under the hood. I'm thinking
> > > transmission?
> > > Thanx again....
> > >
> > >

> >
> > Now try it in the D position (or OD off), OD not trying to shift. That

is
> > a symptom of Torque Converter lockup problem
> >
> > How many miles on the car, when was trans last serviced?
> >
> > Watch the tach... any noticable slippage?

>
> I noticed it does it right around the 30 mph range (18-20,000 on the
> tach), under slight accel, especially when going up an incline. Seems
> like it does it just before the tranny tries to shift to a lower gear,
> like when the motor starts to lug. Sounds exactly like going over
> rumble strips. 49,000 miles on it, just bought it from a lot so I don't
> know when it was last serviced.
> thanx again for the replies...
>



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Old 08-15-2005, 08:01   #9 (permalink)
larrylass
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Posts: n/a
Re: '97 4.6 weird shudder

its the classic famous ford AODE shudder on tq lockup. try a bottle of
lubegard red. if prob persists call lentech trans to have the prob solved
Barbforeverforever<trotzo@earthlink.net> wrote in message
news:1123952341.330843.223070@f14g2000cwb.googlegroups.com...
> Hi all,
> I have a 97 GT 4.6 and I've been having this strange problem. Between
> 1500 and 2000 rpm's I get this strange shudder which feels exactly like
> it would when going over rumble strips in the road. I know it's not
> road noise 'cause when it has happened the road has been flat and
> smooth, it feels like engine vibrations to me. It always happens when
> I'm on the gas at about 1800 rpm's. Anyone else ever had this and what
> do I do to correct it?
> Thanx-
> Trotzo
>



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