What is this "thud" after starting - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

10-12-2005, 22:01

Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
thud coming from the engine\transmission area, as best I can tell from
sitting in the drivers seat.
Sounds like a stuck brake caliper when it releases.
I am sure it is not the A\C clutch, the sound is too loud for that.
Can happen on completely level ground with no contact with the break pedal,
no application or release of the parking brake. So am sure it is not in the
wheel assembly\suspension.
Just in here reading post and came up with this puzzle, will pay more
attention to it in the coming days and post anything I find.
Any clues?

--
From The Desk Of: MsyJsy

10-13-2005, 04:01

"Jesse" <abc.123@xyz> wrote in message
news:1129175780.a705abe58d623ab629976edf5407a16b@teranews...
> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
> thud coming from the engine\transmission area, as best I can tell from
> sitting in the drivers seat.
> Sounds like a stuck brake caliper when it releases.
> I am sure it is not the A\C clutch, the sound is too loud for that.
> Can happen on completely level ground with no contact with the break
> pedal, no application or release of the parking brake. So am sure it is
> not in the wheel assembly\suspension.
> Just in here reading post and came up with this puzzle, will pay more
> attention to it in the coming days and post anything I find.
> Any clues?
>
> --
> From The Desk Of: MsyJsy
>
>
Broken motor mount, maybe? Just a guess on my part.
SC Tom

P.S. Wish my desk was smart enough to post. LOL.

10-13-2005, 06:01

Jesse wrote:
> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
> thud coming from the engine\transmission area, as best I can tell from
> sitting in the drivers seat.
> Sounds like a stuck brake caliper when it releases.
> I am sure it is not the A\C clutch, the sound is too loud for that.
> Can happen on completely level ground with no contact with the break pedal,
> no application or release of the parking brake. So am sure it is not in the
> wheel assembly\suspension.
> Just in here reading post and came up with this puzzle, will pay more
> attention to it in the coming days and post anything I find.
> Any clues?
>
I would almost bet it is the blend door for the AC/heat. Just about
every truck I have owned will make this noise. When shutdown, it seems
the door opens and when started and the vacuum builds, the door slams
shut. Making the thump you hear.

10-13-2005, 09:01

That sounds like something to check into. It is always just a couple of
seconds after starting.
Do you think it would do that in any position on the heater control, or
would there be a position that would cancel it out?

"Marlin Singer" <marlin.singer@verizon.SPAMDAM.net> wrote in message
news:lhs3f.18488$at1.11156@trnddc05...
> Jesse wrote:
>> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
>> thud coming from the engine\transmission area, as best I can tell from
>> sitting in the drivers seat.
>> Sounds like a stuck brake caliper when it releases.
>> I am sure it is not the A\C clutch, the sound is too loud for that.
>> Can happen on completely level ground with no contact with the break
>> pedal, no application or release of the parking brake. So am sure it is
>> not in the wheel assembly\suspension.
>> Just in here reading post and came up with this puzzle, will pay more
>> attention to it in the coming days and post anything I find.
>> Any clues?
>>
> I would almost bet it is the blend door for the AC/heat. Just about every
> truck I have owned will make this noise. When shutdown, it seems the door
> opens and when started and the vacuum builds, the door slams shut. Making
> the thump you hear.

10-13-2005, 11:01

My '99 F350 does it too, it is the blend door making the noise in mine. Just
a "character flaw".

Spdloader

"Marlin Singer" <marlin.singer@verizon.SPAMDAM.net> wrote in message
news:lhs3f.18488$at1.11156@trnddc05...
> Jesse wrote:
>> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
>> thud coming from the engine\transmission area, as best I can tell from
>> sitting in the drivers seat.
>> Sounds like a stuck brake caliper when it releases.
>> I am sure it is not the A\C clutch, the sound is too loud for that.
>> Can happen on completely level ground with no contact with the break
>> pedal, no application or release of the parking brake. So am sure it is
>> not in the wheel assembly\suspension.
>> Just in here reading post and came up with this puzzle, will pay more
>> attention to it in the coming days and post anything I find.
>> Any clues?
>>
> I would almost bet it is the blend door for the AC/heat. Just about every
> truck I have owned will make this noise. When shutdown, it seems the door
> opens and when started and the vacuum builds, the door slams shut. Making
> the thump you hear.

10-13-2005, 12:01

Jesse wrote:
> That sounds like something to check into. It is always just a couple of
> seconds after starting.
> Do you think it would do that in any position on the heater control, or
> would there be a position that would cancel it out?
>
>
> "Marlin Singer" <marlin.singer@verizon.SPAMDAM.net> wrote in message
> news:lhs3f.18488$at1.11156@trnddc05...
>> Jesse wrote:
>>> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
>>> thud coming from the engine\transmission area, as best I can tell from
>>> sitting in the drivers seat.
>>> Sounds like a stuck brake caliper when it releases.
>>> I am sure it is not the A\C clutch, the sound is too loud for that.
>>> Can happen on completely level ground with no contact with the break
>>> pedal, no application or release of the parking brake. So am sure it is
>>> not in the wheel assembly\suspension.
>>> Just in here reading post and came up with this puzzle, will pay more
>>> attention to it in the coming days and post anything I find.
>>> Any clues?
>>>
>> I would almost bet it is the blend door for the AC/heat. Just about every
>> truck I have owned will make this noise. When shutdown, it seems the door
>> opens and when started and the vacuum builds, the door slams shut. Making
>> the thump you hear.
>
>
Not sure, you might try making sure everything is off before you shut
down, and if you park on a slope where you are nose up, you might try
nose down. I have found it to be no big deal, just quirk.

10-13-2005, 20:01

On Wed, 12 Oct 2005 20:56:18 -0700, "Jesse" <abc.123@xyz> wrote:

>Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
>thud coming from the engine\transmission area, as best I can tell from
>sitting in the drivers seat.
>Sounds like a stuck brake caliper when it releases.
>I am sure it is not the A\C clutch, the sound is too loud for that.
>Can happen on completely level ground with no contact with the break pedal,
>no application or release of the parking brake. So am sure it is not in the
>wheel assembly\suspension.
>Just in here reading post and came up with this puzzle, will pay more
>attention to it in the coming days and post anything I find.
>Any clues?

I think you may have the same "problem" a lot of folks complain about.
It's possible it's a vacuum controlled door in the ventilation plenum
cloing (or opening, I can't remember which way it goes)

Can you feel it in the floorboard when it happens? If so, that'd be
my guess. Nothing to worry about.

10-13-2005, 20:01

> I hear, and feel a thud > Sounds like a stuck brake caliper when it
> releases.

> I am sure it is not the A\C clutch, the sound is too loud for that.
I think it probably is.

is the A/C OFF, Fan OFF Temp @ cold ?

I had the same thing on starting but after turning all the dials to 'off',
it stopped.

After that, I once inadvertently left the dials on A\C what I got home,
and when I started up next AM,, it was back..THUD!

10-15-2005, 18:01

I had a concern that is was the transfer case kicking the 4X4 in and out.
But I think and can safely agree it is nothing to worry about anymore.
Thanks for the info all.

--
From The Desk Of: MsyJsy
"Jesse" <abc.123@xyz> wrote in message
news:1129175780.a705abe58d623ab629976edf5407a16b@teranews...
> Virtually every time I start my `04 Ranger (4.0 Auto) I hear, and feel a
> thud coming from the engine\transmission area, as best I can tell from
> sitting in the drivers seat.
> Sounds like a stuck brake caliper when it releases.
> I am sure it is not the A\C clutch, the sound is too loud for that.
> Can happen on completely level ground with no contact with the break
> pedal, no application or release of the parking brake. So am sure it is
> not in the wheel assembly\suspension.
> Just in here reading post and came up with this puzzle, will pay more
> attention to it in the coming days and post anything I find.
> Any clues?
>
> --
> From The Desk Of: MsyJsy
>
>

10-16-2005, 17:01

On Sat, 15 Oct 2005 17:07:55 -0700, msyjsy wrote:

> I had a concern that is was the transfer case kicking the 4X4 in and out.
> But I think and can safely agree it is nothing to worry about anymore.
> Thanks for the info all.

I have a similar thump when I start up my F-550 PSD, usually about 2-3
seconds after ignition. The truck tech says it has to do with some
sort of damper thingie in the heating system, and is completely
normal. I've been hearing it now for 2 years and 30,000 miles without any
problem developing.

Regards, John Kinney