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Old 08-09-2005, 18:01   #1 (permalink)
Bryan
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F-150 Supercrew Engine Revving with no added power?

Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will sound
like it's revving like crazy, but there's no added power to go with it. I'm
having trouble remembering to look at the tachometer when this happens, but
I think it really isn't increasing the rpm's. What it really sounds like is
a big air sucking sound more than an increase in rpms. Does anyone have any
idea what I'm trying to describe and what it's all about? It even seems
like a loss of power when this is happening.


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Old 08-09-2005, 19:01   #2 (permalink)
Mark Olson
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Re: F-150 Supercrew Engine Revving with no added power?

Bryan wrote:
> Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will sound
> like it's revving like crazy, but there's no added power to go with it. I'm
> having trouble remembering to look at the tachometer when this happens, but
> I think it really isn't increasing the rpm's. What it really sounds like is
> a big air sucking sound more than an increase in rpms. Does anyone have any
> idea what I'm trying to describe and what it's all about? It even seems
> like a loss of power when this is happening.


I'll bet it is the cooling fan clutch engaging. Does this only happen
when it's hot and at low speed?
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Old 08-09-2005, 22:01   #3 (permalink)
Bryan
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Re: F-150 Supercrew Engine Revving with no added power?


"Mark Olson" <olsonm@tiny.invalid> wrote in message
news:11fikmoi597r3e3@corp.supernews.com...
> Bryan wrote:
>> Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will
>> sound like it's revving like crazy, but there's no added power to go with
>> it. I'm having trouble remembering to look at the tachometer when this
>> happens, but I think it really isn't increasing the rpm's. What it
>> really sounds like is a big air sucking sound more than an increase in
>> rpms. Does anyone have any idea what I'm trying to describe and what
>> it's all about? It even seems like a loss of power when this is
>> happening.

>
> I'll bet it is the cooling fan clutch engaging. Does this only happen
> when it's hot and at low speed?


Yes.


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Old 08-09-2005, 22:01   #4 (permalink)
CJB
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Re: F-150 Supercrew Engine Revving with no added power?

I second that motion.

CJB

"Mark Olson" <olsonm@tiny.invalid> wrote in message
news:11fikmoi597r3e3@corp.supernews.com...
> Bryan wrote:
> > Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will

sound
> > like it's revving like crazy, but there's no added power to go with it.

I'm
> > having trouble remembering to look at the tachometer when this happens,

but
> > I think it really isn't increasing the rpm's. What it really sounds

like is
> > a big air sucking sound more than an increase in rpms. Does anyone have

any
> > idea what I'm trying to describe and what it's all about? It even seems
> > like a loss of power when this is happening.

>
> I'll bet it is the cooling fan clutch engaging. Does this only happen
> when it's hot and at low speed?



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Old 08-09-2005, 23:01   #5 (permalink)
Bryan
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Re: F-150 Supercrew Engine Revving with no added power?


"CJB" <brown_family@cox.net> wrote in message
news:1efKe.13290$Tr6.5988@lakeread02...
>I second that motion.
>
> CJB
>
> "Mark Olson" <olsonm@tiny.invalid> wrote in message
> news:11fikmoi597r3e3@corp.supernews.com...
>> Bryan wrote:
>> > Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will

> sound
>> > like it's revving like crazy, but there's no added power to go with it.

> I'm
>> > having trouble remembering to look at the tachometer when this happens,

> but
>> > I think it really isn't increasing the rpm's. What it really sounds

> like is
>> > a big air sucking sound more than an increase in rpms. Does anyone
>> > have

> any
>> > idea what I'm trying to describe and what it's all about? It even
>> > seems
>> > like a loss of power when this is happening.

>>
>> I'll bet it is the cooling fan clutch engaging. Does this only happen
>> when it's hot and at low speed?

>
>


So what is the deal with the cooling clutch fan? Is it behaving properly?
If not ...


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Old 08-10-2005, 03:01   #6 (permalink)
David M
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Re: F-150 Supercrew Engine Revving with no added power?

On Wed, 10 Aug 2005 05:10:31 +0000, Bryan rearranged some electrons to
form:

>
> "CJB" <brown_family@cox.net> wrote in message
> news:1efKe.13290$Tr6.5988@lakeread02...
>>I second that motion.
>>
>> CJB
>>
>> "Mark Olson" <olsonm@tiny.invalid> wrote in message
>> news:11fikmoi597r3e3@corp.supernews.com...
>>> Bryan wrote:
>>> > Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will

>> sound
>>> > like it's revving like crazy, but there's no added power to go with it.

>> I'm
>>> > having trouble remembering to look at the tachometer when this happens,

>> but
>>> > I think it really isn't increasing the rpm's. What it really sounds

>> like is
>>> > a big air sucking sound more than an increase in rpms. Does anyone
>>> > have

>> any
>>> > idea what I'm trying to describe and what it's all about? It even
>>> > seems
>>> > like a loss of power when this is happening.
>>>
>>> I'll bet it is the cooling fan clutch engaging. Does this only happen
>>> when it's hot and at low speed?

>>
>>

>
> So what is the deal with the cooling clutch fan? Is it behaving properly?
> If not ...


Normal, as long as it's not overheating.

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 12 days 6:56

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Old 08-10-2005, 22:01   #7 (permalink)
Bryan
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Posts: n/a
Re: F-150 Supercrew Engine Revving with no added power?


"David M" <NOSPAM@nospam.com> wrote in message
news:pan.2005.08.10.09.39.59.929360@sled351...
> On Wed, 10 Aug 2005 05:10:31 +0000, Bryan rearranged some electrons to
> form:
>
>>
>> "CJB" <brown_family@cox.net> wrote in message
>> news:1efKe.13290$Tr6.5988@lakeread02...
>>>I second that motion.
>>>
>>> CJB
>>>
>>> "Mark Olson" <olsonm@tiny.invalid> wrote in message
>>> news:11fikmoi597r3e3@corp.supernews.com...
>>>> Bryan wrote:
>>>> > Intermittently my F-150 Supercrew 2001 5.4(?)L (gasoline) truck will
>>> sound
>>>> > like it's revving like crazy, but there's no added power to go with
>>>> > it.
>>> I'm
>>>> > having trouble remembering to look at the tachometer when this
>>>> > happens,
>>> but
>>>> > I think it really isn't increasing the rpm's. What it really sounds
>>> like is
>>>> > a big air sucking sound more than an increase in rpms. Does anyone
>>>> > have
>>> any
>>>> > idea what I'm trying to describe and what it's all about? It even
>>>> > seems
>>>> > like a loss of power when this is happening.
>>>>
>>>> I'll bet it is the cooling fan clutch engaging. Does this only happen
>>>> when it's hot and at low speed?
>>>
>>>

>>
>> So what is the deal with the cooling clutch fan? Is it behaving
>> properly?
>> If not ...

>
> Normal, as long as it's not overheating.
>
> --
> David M (dmacchiarolo)
> http://home.triad.rr.com/redsled
> T/S 53
> sled351 Linux 2.4.18-14 has been up 12 days 6:56
>


No sign of overheating.
Thanks to all!


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