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Old 06-28-2005, 08:01   #1 (permalink)
james.freire@gmail.com
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'90 5.0 Engine slows to a stop

Hi All,

I am a proud new owner of a 1990 Mustang 5.0 GT. Today while getting
off the highway going to work my engine lost RPM and stopped. I had
already downshifted into 2nd gear and suddenly the car felt like I had
taken my foot off the gas, but despite giving more throttle, the car
just stalled. I found it weird because the engine just didnt stop, but
the RPM dropped before stalling. I had to restart the car 2 times in
the space of about a mile, the 2nd time as I was pulling into the gas
station. The tank was low but I dont think I was empty. This has
happened to me before when I had plenty of gas in the tank. (As a side
note I had changed my sparkplugs, oil and adjusted my timing last
night)
Could it be a problem with my fuel delivery?

Thanks a lot for any help!

-James

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Old 06-28-2005, 08:01   #2 (permalink)
The Outlander
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Re: '90 5.0 Engine slows to a stop

Check your fuel pressure .... it should be somewhere between 30-40

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Old 06-29-2005, 08:01   #3 (permalink)
Backyard Mechanic
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Re: '90 5.0 Engine slows to a stop

> I found it weird because the engine just didnt stop, but
> the RPM dropped before stalling.


If the needle dropped to the peg but the engine was still turning at
reasonable rpm... remove the TFI (Ignition Module), bet you find the grease
on the back hard and caky... should be GREASY.

Alternative is the ign power from the switch, notorious in those years for
failing.

ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED AT IT,
DO SO... RELUBE IT before it fails! That means take off the old, put on
new.
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Old 06-29-2005, 21:01   #4 (permalink)
Brad and Mia
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Re: '90 5.0 Engine slows to a stop


"Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
news:Xns96845BF74B917pettyfogyahoocom@207.115.63.158...
>> I found it weird because the engine just didnt stop, but
>> the RPM dropped before stalling.

>
> If the needle dropped to the peg but the engine was still turning at
> reasonable rpm... remove the TFI (Ignition Module), bet you find the
> grease
> on the back hard and caky... should be GREASY.
>
> Alternative is the ign power from the switch, notorious in those years for
> failing.
>
> ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED AT IT,
> DO SO... RELUBE IT before it fails! That means take off the old, put on
> new.


Okay, where is the TFI? I've got the grease and the time...

Thx

Brad


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Old 06-30-2005, 04:01   #5 (permalink)
David M
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Re: '90 5.0 Engine slows to a stop

On Thu, 30 Jun 2005 02:45:37 +0000, Brad and Mia rearranged some electrons
to form:

>
> "Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
> news:Xns96845BF74B917pettyfogyahoocom@207.115.63.158...
>>> I found it weird because the engine just didnt stop, but
>>> the RPM dropped before stalling.

>>
>> If the needle dropped to the peg but the engine was still turning at
>> reasonable rpm... remove the TFI (Ignition Module), bet you find the
>> grease
>> on the back hard and caky... should be GREASY.
>>
>> Alternative is the ign power from the switch, notorious in those years for
>> failing.
>>
>> ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED AT IT,
>> DO SO... RELUBE IT before it fails! That means take off the old, put on
>> new.

>
> Okay, where is the TFI? I've got the grease and the time...
>
> Thx
>
> Brad


Mounted on the distributor. The grease is thermal compound
that allows heat to conduct from the module to the distributor
body. It's not dielectric grease.

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 9 days 23:42

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Old 06-30-2005, 12:01   #6 (permalink)
Backyard Mechanic
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Re: '90 5.0 Engine slows to a stop

David M <NOSPAM@nospam.com> wrote in
news:pan.2005.06.30.09.33.54.33181@sled351:

> On Thu, 30 Jun 2005 02:45:37 +0000, Brad and Mia rearranged some
> electrons to form:
>
>>
>> "Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
>> news:Xns96845BF74B917pettyfogyahoocom@207.115.63.158...
>>>> I found it weird because the engine just didnt stop, but
>>>> the RPM dropped before stalling.
>>>
>>> If the needle dropped to the peg but the engine was still turning at
>>> reasonable rpm... remove the TFI (Ignition Module), bet you find the
>>> grease
>>> on the back hard and caky... should be GREASY.
>>>
>>> Alternative is the ign power from the switch, notorious in those
>>> years for failing.
>>>
>>> ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED
>>> AT IT, DO SO... RELUBE IT before it fails! That means take off the
>>> old, put on new.

>>
>> Okay, where is the TFI? I've got the grease and the time...
>>
>> Thx
>>
>> Brad

>
> Mounted on the distributor. The grease is thermal compound
> that allows heat to conduct from the module to the distributor
> body. It's not dielectric grease.
>


Dielectric grease works just fine.... as does plumbers silicone grease
from Lowes, it's the temp rating that counts.

And the white grease for heat sinks always WAS called "dielectric
grease" in the electronics industry.
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Old 06-30-2005, 15:01   #7 (permalink)
The Outlander
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Re: '90 5.0 Engine slows to a stop

On the 95 5.0 it is below the air intake on the passenger side firewall
....I think ... can someone confirm this ?

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Old 06-30-2005, 19:01   #8 (permalink)
David M
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Posts: n/a
Re: '90 5.0 Engine slows to a stop

On Thu, 30 Jun 2005 12:04:41 +0000, Backyard Mechanic rearranged some
electrons to form:

> David M <NOSPAM@nospam.com> wrote in
> news:pan.2005.06.30.09.33.54.33181@sled351:
>
>> On Thu, 30 Jun 2005 02:45:37 +0000, Brad and Mia rearranged some
>> electrons to form:
>>
>>>
>>> "Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
>>> news:Xns96845BF74B917pettyfogyahoocom@207.115.63.158...
>>>>> I found it weird because the engine just didnt stop, but
>>>>> the RPM dropped before stalling.
>>>>
>>>> If the needle dropped to the peg but the engine was still turning at
>>>> reasonable rpm... remove the TFI (Ignition Module), bet you find the
>>>> grease
>>>> on the back hard and caky... should be GREASY.
>>>>
>>>> Alternative is the ign power from the switch, notorious in those
>>>> years for failing.
>>>>
>>>> ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED
>>>> AT IT, DO SO... RELUBE IT before it fails! That means take off the
>>>> old, put on new.
>>>
>>> Okay, where is the TFI? I've got the grease and the time...
>>>
>>> Thx
>>>
>>> Brad

>>
>> Mounted on the distributor. The grease is thermal compound
>> that allows heat to conduct from the module to the distributor
>> body. It's not dielectric grease.
>>

>
> Dielectric grease works just fine.... as does plumbers silicone grease
> from Lowes, it's the temp rating that counts.
>
> And the white grease for heat sinks always WAS called "dielectric
> grease" in the electronics industry.


Not in the electronics industry that I work in. There is a
distinct difference between thermal compound and dielectric grease.
It's not the "temp rating" that matters, it's the thermal efficiency
that matters. Thermal (heat sink) compound has a thermal conductivity
higher than dielectric grease, usually greater than 1 watt/meter-K.
The thermal conductivity of dielectric grease is normally not specified.

Check it for yourself: www.dowcorning.com among others.

We use them both in the equipment that we design, and they are most
definitly not the same thing.


--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
T/S 53
sled351 Linux 2.4.18-14 has been up 10 days 13:55

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Old 07-01-2005, 09:02   #9 (permalink)
cprice@here.com
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Re: '90 5.0 Engine slows to a stop


No, I think the TFI is on the distributor itself. Its the thing that
the wire harness plugs into on the distributor. I think it is held on by
two small-ish hex head screws.

The Outlander wrote:
> On the 95 5.0 it is below the air intake on the passenger side firewall
> ...I think ... can someone confirm this ?
>

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Old 07-01-2005, 17:02   #10 (permalink)
WindsorFox[SS]
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Re: '90 5.0 Engine slows to a stop

Backyard Mechanic wrote:
>>I found it weird because the engine just didnt stop, but
>>the RPM dropped before stalling.

>
>
> If the needle dropped to the peg but the engine was still turning at
> reasonable rpm... remove the TFI (Ignition Module), bet you find the grease
> on the back hard and caky... should be GREASY.
>
> Alternative is the ign power from the switch, notorious in those years for
> failing.
>
> ALL YOU GUYS OUT THERE WITH THE TFI SYSTEM ... IF YOU NEVER LOOKED AT IT,
> DO SO... RELUBE IT before it fails! That means take off the old, put on
> new.



So, your idea here is that if I keep the heat sink compound fresh,
my TFI modual won't go out like they are prone to do? I didn't think
they were *that* sensative to heat, but that would account for all the
sudden failures.

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