Bob

"pick one" <try again!> wrote in message
news:qdydnTZfgojfNarfRVn-oA@comcast.com...
>> Bad catalyic convertors can cause the engine to overheat because most of
>> the heat is removed by the exahuast, and if the exhaust gas doesn't
>> leave as fast, the heat stays behind.
>>
>
> If the exhaust does not leave the engine can not take in fresh air.
> Because of the lack of oxygen fuel does not burn. Because fuel does not
> burn no heat.

That sounds good on paper but it's not really true in the real world. Think
in terms of really bad efficiency, throttle at 50 or 75% just to maintain
speed and the trans will probably be in 2nd or 3rd instead of OD. Soon
things are smoking hot.
Bob

 

Jeff

"pick one" <try again!> wrote in message
news:qdydnTZfgojfNarfRVn-oA@comcast.com...
>
> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
> news:4237a40f$0$45877$16897aa@news.airnews.net...
>>
>> "Cory Dunkle" <cdnews@comcast.net> wrote in message
>> news:kKCdnXPU-drtwarfRVn-uQ@comcast.com...
>>> "neil" <ndbowie@shaw.ca> wrote in message
>>> news:nZ5Zd.670018$8l.628120@pd7tw1no...
>>>> Hello All
>>>>
>>>> I have a 1994 Taurus wagon with a 3.8 V6, the car runs fine, well it
>>>> did
>>>> until now. We took a trip out of town, the trip took about 1.5 hours,
>>>> (almost all freeway, averaged 60 mph on cruise) and ended with a long
>>> upward
>>>> hill. When we stopped at a gas station the car would not idle properly,
>>> ran
>>>> rough, and then stalled. After about 15 minutes the car started and
>>>> ran
>>> ok,
>>>> we were at our destination so we parked for the night. The next day the
>>> car
>>>> started and ran like normal so we returned home, the car again after
>>>> about
>>>> 1.5 hours of freeway driving started to act up, first the check engine
>>> light
>>>> start coming on, then going out, as well as noticeable power loss when
>>>> trying to accelerate.
>>>> When we pulled off the freeway and the car stalled at the first stop
>>> sign.
>>>> We were able to inch the car home, each time stopping for about 10
>>>> minutes
>>>> or until the car would start and run to the next stop sign or light.
>>>>
>>>> Now I am confused, a friend told me that it may be the catalytic
>>> converter,
>>>> how and why? these parts are very expensive, I do not want to go about
>>>> trying to fix this problem with a trial and error approach.
>>>>
>>>> I have only owned the car for the last 6 months and have no maintenance
>>>> history.
>>>>
>>>> I thank anyone who responds to my post, as I would like to know
>>>> something
>>>> before I have to take it in to the dealership.
>>>>
>>>> Cheers
>>>> Neil
>>>
>>> It could be overheating.
>>>
>>> I had the same problem when I forgot to put coolant back in my old 289
>>> after
>>> putting a different pair of heads on it. The heads had large chambers so
>>> compression was lower and I expected power to be lower. So I ran the car
>>> for
>>> a week with virtually no coolant. The overheat light never triggered
>>> because
>>> I accidentally broke the sender (it was a bad day). Anyhow, running on
>>> teh
>>> highway it was gutless. Stopping for a toll booth it stalled and didn't
>>> wanna start. Took me a minute to get it started again and then it ran
>>> alright once I got moving again. Finally I remembered I forgot to fill
>>> the
>>> coolant system so I pulled over and filled it. Problem solved. More
>>> power
>>> and didn't run rough or stall. Of course I had gone a few hundred miles
>>> with
>>> no coolant already, but no harm was done. Those 289s sure are tough
>>> little
>>> engines!
>>>
>>> So, make sure your coolant system is full and your thermostat is
>>> working.
>>> Also, you may wanna check that your temp sensor is working and your
>>> overheat
>>> light bulb is not burnt out or otherwise non-functional.
>>>
>>> An engine can overheat for several reasons other than that, such as
>>> retarded
>>> timing, malfunctioning fan, malfunctioning EGR valve, I suppose O2
>>> sensors
>>> could cause it as well.
>>
>> Bad catalyic convertors can cause the engine to overheat because most of
>> the heat is removed by the exahuast, and if the exhaust gas doesn't
>> leave as fast, the heat stays behind.
>>
>
> If the exhaust does not leave the engine can not take in fresh air.
> Because of the lack of oxygen fuel does not burn. Because fuel does not
> burn no heat.

I apologise. I was not clear enough. I meant if the catalytic constricts the
flow of exhaust without completely blocking the outflow. The heat doesn't
leave the engine as fast, causing overheating.

Jeff


>> Jeff
>>> Anyhow, it's just something that may be worth checking.
>>>
>>> Cory
>>>
>>>
>>
>>
>
>

pick one

"Jeff" <kidsdoc2000@hotmail.com> wrote in message
news:4237bcbf$0$88040$16897aa@news.airnews.net...
>
> "pick one" <try again!> wrote in message
> news:qdydnTZfgojfNarfRVn-oA@comcast.com...
>>
>> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
>> news:4237a40f$0$45877$16897aa@news.airnews.net...
>>>
>>> "Cory Dunkle" <cdnews@comcast.net> wrote in message
>>> news:kKCdnXPU-drtwarfRVn-uQ@comcast.com...
>>>> "neil" <ndbowie@shaw.ca> wrote in message
>>>> news:nZ5Zd.670018$8l.628120@pd7tw1no...
>>>>> Hello All
>>>>>
>>>>> I have a 1994 Taurus wagon with a 3.8 V6, the car runs fine, well it did
>>>>> until now. We took a trip out of town, the trip took about 1.5 hours,
>>>>> (almost all freeway, averaged 60 mph on cruise) and ended with a long
>>>> upward
>>>>> hill. When we stopped at a gas station the car would not idle properly,
>>>> ran
>>>>> rough, and then stalled. After about 15 minutes the car started and ran
>>>> ok,
>>>>> we were at our destination so we parked for the night. The next day the
>>>> car
>>>>> started and ran like normal so we returned home, the car again after about
>>>>> 1.5 hours of freeway driving started to act up, first the check engine
>>>> light
>>>>> start coming on, then going out, as well as noticeable power loss when
>>>>> trying to accelerate.
>>>>> When we pulled off the freeway and the car stalled at the first stop
>>>> sign.
>>>>> We were able to inch the car home, each time stopping for about 10 minutes
>>>>> or until the car would start and run to the next stop sign or light.
>>>>>
>>>>> Now I am confused, a friend told me that it may be the catalytic
>>>> converter,
>>>>> how and why? these parts are very expensive, I do not want to go about
>>>>> trying to fix this problem with a trial and error approach.
>>>>>
>>>>> I have only owned the car for the last 6 months and have no maintenance
>>>>> history.
>>>>>
>>>>> I thank anyone who responds to my post, as I would like to know something
>>>>> before I have to take it in to the dealership.
>>>>>
>>>>> Cheers
>>>>> Neil
>>>>
>>>> It could be overheating.
>>>>
>>>> I had the same problem when I forgot to put coolant back in my old 289
>>>> after
>>>> putting a different pair of heads on it. The heads had large chambers so
>>>> compression was lower and I expected power to be lower. So I ran the car
>>>> for
>>>> a week with virtually no coolant. The overheat light never triggered
>>>> because
>>>> I accidentally broke the sender (it was a bad day). Anyhow, running on teh
>>>> highway it was gutless. Stopping for a toll booth it stalled and didn't
>>>> wanna start. Took me a minute to get it started again and then it ran
>>>> alright once I got moving again. Finally I remembered I forgot to fill the
>>>> coolant system so I pulled over and filled it. Problem solved. More power
>>>> and didn't run rough or stall. Of course I had gone a few hundred miles
>>>> with
>>>> no coolant already, but no harm was done. Those 289s sure are tough little
>>>> engines!
>>>>
>>>> So, make sure your coolant system is full and your thermostat is working.
>>>> Also, you may wanna check that your temp sensor is working and your
>>>> overheat
>>>> light bulb is not burnt out or otherwise non-functional.
>>>>
>>>> An engine can overheat for several reasons other than that, such as
>>>> retarded
>>>> timing, malfunctioning fan, malfunctioning EGR valve, I suppose O2 sensors
>>>> could cause it as well.
>>>
>>> Bad catalyic convertors can cause the engine to overheat because most of the
>>> heat is removed by the exahuast, and if the exhaust gas doesn't leave as
>>> fast, the heat stays behind.
>>>
>>
>> If the exhaust does not leave the engine can not take in fresh air. Because
>> of the lack of oxygen fuel does not burn. Because fuel does not burn no heat.
>
> I apologise. I was not clear enough. I meant if the catalytic constricts the
> flow of exhaust without completely blocking the outflow. The heat doesn't
> leave the engine as fast, causing overheating.
>
> Jeff
>
It will still not overheat the engine, simply because there is less oxygen fuel
is not burning completely, less heat. If the cats can still do there job some
what they may get real hot but the engine is starving and will not. The engine
will be simply very low on power and act very much like it's running out of fuel
at higher RPM's and under load.

>
>>> Jeff
>>>> Anyhow, it's just something that may be worth checking.
>>>>
>>>> Cory
>>>>
>>>>
>>>
>>>
>>
>>
>
>

pick one

"Bob" <sorry@ihatespam.net> wrote in message
news:ZKOZd.56989$ie.20278@fe06.lga...
>
> "pick one" <try again!> wrote in message
> news:qdydnTZfgojfNarfRVn-oA@comcast.com...
>>> Bad catalyic convertors can cause the engine to overheat because most of the
>>> heat is removed by the exahuast, and if the exhaust gas doesn't leave as
>>> fast, the heat stays behind.
>>>
>>
>> If the exhaust does not leave the engine can not take in fresh air. Because
>> of the lack of oxygen fuel does not burn. Because fuel does not burn no heat.
>
> That sounds good on paper but it's not really true in the real world. Think in
> terms of really bad efficiency, throttle at 50 or 75% just to maintain speed
> and the trans will probably be in 2nd or 3rd instead of OD. Soon things are
> smoking hot.
> Bob
>
The engine even wide open will act just like it's running out of fuel. You wont
go any where. It's not only good on paper but it's a fact because of the basic
laws of science.

Jeff

"pick one" <try again!> wrote in message
news:_LKdnTguhOF4vaXfRVn-vg@comcast.com...
>
> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
> news:4237bcbf$0$88040$16897aa@news.airnews.net...

(...)

>> I apologise. I was not clear enough. I meant if the catalytic constricts
>> the flow of exhaust without completely blocking the outflow. The heat
>> doesn't leave the engine as fast, causing overheating.
>>
>> Jeff
>>
> It will still not overheat the engine, simply because there is less oxygen
> fuel is not burning completely, less heat. If the cats can still do there
> job some what they may get real hot but the engine is starving and will
> not. The engine will be simply very low on power and act very much like
> it's running out of fuel at higher RPM's and under load.

That's news to me. A bad catalytic convertor doesn't cause the fuel to burn
incompletely.

http://autorepair.about.com/cs/gener...a080401a_3.htm

Jeff

Cory Dunkle

<pickone@kato.com> wrote in message
news:ohue31dq63bhu7v9gs45hr1rjh4ibpg85k@4ax.com...
> On Tue, 15 Mar 2005 17:06:59 -0500, "Cory Dunkle" <cdnews@comcast.net>
> wrote:
>
> >"neil" <ndbowie@shaw.ca> wrote in message
> >news:nZ5Zd.670018$8l.628120@pd7tw1no...
> >> Hello All
> >>
> >> I have a 1994 Taurus wagon with a 3.8 V6, the car runs fine, well it
did
> >> until now. We took a trip out of town, the trip took about 1.5 hours,
> >> (almost all freeway, averaged 60 mph on cruise) and ended with a long
> >upward
> >> hill. When we stopped at a gas station the car would not idle properly,
> >ran
> >> rough, and then stalled. After about 15 minutes the car started and
ran
> >ok,
> >> we were at our destination so we parked for the night. The next day the
> >car
> >> started and ran like normal so we returned home, the car again after
about
> >> 1.5 hours of freeway driving started to act up, first the check engine
> >light
> >> start coming on, then going out, as well as noticeable power loss when
> >> trying to accelerate.
> >> When we pulled off the freeway and the car stalled at the first stop
> >sign.
> >> We were able to inch the car home, each time stopping for about 10
minutes
> >> or until the car would start and run to the next stop sign or light.
> >>
> >> Now I am confused, a friend told me that it may be the catalytic
> >converter,
> >> how and why? these parts are very expensive, I do not want to go about
> >> trying to fix this problem with a trial and error approach.
> >>
> >> I have only owned the car for the last 6 months and have no maintenance
> >> history.
> >>
> >> I thank anyone who responds to my post, as I would like to know
something
> >> before I have to take it in to the dealership.
> >>
> >> Cheers
> >> Neil
> >
> >It could be overheating.
> >
> >I had the same problem when I forgot to put coolant back in my old 289
after
> >putting a different pair of heads on it. The heads had large chambers so
> >compression was lower and I expected power to be lower. So I ran the car
for
> >a week with virtually no coolant. The overheat light never triggered
because
> >I accidentally broke the sender (it was a bad day). Anyhow, running on
teh
> >highway it was gutless. Stopping for a toll booth it stalled and didn't
> >wanna start. Took me a minute to get it started again and then it ran
> >alright once I got moving again. Finally I remembered I forgot to fill
the
> >coolant system so I pulled over and filled it. Problem solved. More power
> >and didn't run rough or stall. Of course I had gone a few hundred miles
with
> >no coolant already, but no harm was done. Those 289s sure are tough
little
> >engines!
> >
> >So, make sure your coolant system is full and your thermostat is working.
> >Also, you may wanna check that your temp sensor is working and your
overheat
> >light bulb is not burnt out or otherwise non-functional.
> >
> >An engine can overheat for several reasons other than that, such as
retarded
> >timing, malfunctioning fan, malfunctioning EGR valve, I suppose O2
sensors
> >could cause it as well.
> >
> >Anyhow, it's just something that may be worth checking.
> >
> > Cory
> >
> cory explain how an egr o2 sensors could cause itvto over heat

I believe you are the resident troll, but I don't recall so I'll explain
anyway. A malfuctioning EGR system can lean out the mixture. A
malfunctioning O2 sensor may result in giving an false rich reading, the
computer will compensate by leaning out the mixture. A leaner mixture burns
hotter, raising combustion chamber temps and thus the temperature of the
entire engine. Also, an excessively lean mixture can burn holes in pistons
and do some real nasty damage.

Cory

pick one

"Cory Dunkle" <cdnews@comcast.net> wrote in message
news:7bGdnUscQPfCxaXfRVn-pQ@comcast.com...
> <pickone@kato.com> wrote in message
> news:ohue31dq63bhu7v9gs45hr1rjh4ibpg85k@4ax.com...
>> On Tue, 15 Mar 2005 17:06:59 -0500, "Cory Dunkle" <cdnews@comcast.net>
>> wrote:
>>
>> >"neil" <ndbowie@shaw.ca> wrote in message
>> >news:nZ5Zd.670018$8l.628120@pd7tw1no...
>> >> Hello All
>> >>
>> >> I have a 1994 Taurus wagon with a 3.8 V6, the car runs fine, well it
> did
>> >> until now. We took a trip out of town, the trip took about 1.5 hours,
>> >> (almost all freeway, averaged 60 mph on cruise) and ended with a long
>> >upward
>> >> hill. When we stopped at a gas station the car would not idle properly,
>> >ran
>> >> rough, and then stalled. After about 15 minutes the car started and
> ran
>> >ok,
>> >> we were at our destination so we parked for the night. The next day the
>> >car
>> >> started and ran like normal so we returned home, the car again after
> about
>> >> 1.5 hours of freeway driving started to act up, first the check engine
>> >light
>> >> start coming on, then going out, as well as noticeable power loss when
>> >> trying to accelerate.
>> >> When we pulled off the freeway and the car stalled at the first stop
>> >sign.
>> >> We were able to inch the car home, each time stopping for about 10
> minutes
>> >> or until the car would start and run to the next stop sign or light.
>> >>
>> >> Now I am confused, a friend told me that it may be the catalytic
>> >converter,
>> >> how and why? these parts are very expensive, I do not want to go about
>> >> trying to fix this problem with a trial and error approach.
>> >>
>> >> I have only owned the car for the last 6 months and have no maintenance
>> >> history.
>> >>
>> >> I thank anyone who responds to my post, as I would like to know
> something
>> >> before I have to take it in to the dealership.
>> >>
>> >> Cheers
>> >> Neil
>> >
>> >It could be overheating.
>> >
>> >I had the same problem when I forgot to put coolant back in my old 289
> after
>> >putting a different pair of heads on it. The heads had large chambers so
>> >compression was lower and I expected power to be lower. So I ran the car
> for
>> >a week with virtually no coolant. The overheat light never triggered
> because
>> >I accidentally broke the sender (it was a bad day). Anyhow, running on
> teh
>> >highway it was gutless. Stopping for a toll booth it stalled and didn't
>> >wanna start. Took me a minute to get it started again and then it ran
>> >alright once I got moving again. Finally I remembered I forgot to fill
> the
>> >coolant system so I pulled over and filled it. Problem solved. More power
>> >and didn't run rough or stall. Of course I had gone a few hundred miles
> with
>> >no coolant already, but no harm was done. Those 289s sure are tough
> little
>> >engines!
>> >
>> >So, make sure your coolant system is full and your thermostat is working.
>> >Also, you may wanna check that your temp sensor is working and your
> overheat
>> >light bulb is not burnt out or otherwise non-functional.
>> >
>> >An engine can overheat for several reasons other than that, such as
> retarded
>> >timing, malfunctioning fan, malfunctioning EGR valve, I suppose O2
> sensors
>> >could cause it as well.
>> >
>> >Anyhow, it's just something that may be worth checking.
>> >
>> > Cory
>> >
>> cory explain how an egr o2 sensors could cause itvto over heat
>
> I believe you are the resident troll, but I don't recall so I'll explain
> anyway. A malfuctioning EGR system can lean out the mixture.

The EGR gasses displaces the oxygen, so in effect the mixture is not lean. There
is less oxygen to support combustion.


> A
> malfunctioning O2 sensor may result in giving an false rich reading, the
> computer will compensate by leaning out the mixture.

The mixture that the ECM provides will never get to that point.

>A leaner mixture burns
> hotter, raising combustion chamber temps and thus the temperature of the
> entire engine. Also, an excessively lean mixture can burn holes in pistons
> and do some real nasty damage.
>
> Cory
>
>

pick one

"Jeff" <kidsdoc2000@hotmail.com> wrote in message
news:4238399d$0$88042$16897aa@news.airnews.net...
>
> "pick one" <try again!> wrote in message
> news:_LKdnTguhOF4vaXfRVn-vg@comcast.com...
>>
>> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
>> news:4237bcbf$0$88040$16897aa@news.airnews.net...
>
> (...)
>
>>> I apologise. I was not clear enough. I meant if the catalytic constricts the
>>> flow of exhaust without completely blocking the outflow. The heat doesn't
>>> leave the engine as fast, causing overheating.
>>>
>>> Jeff
>>>
>> It will still not overheat the engine, simply because there is less oxygen
>> fuel is not burning completely, less heat. If the cats can still do there job
>> some what they may get real hot but the engine is starving and will not. The
>> engine will be simply very low on power and act very much like it's running
>> out of fuel at higher RPM's and under load.
>
> That's news to me. A bad catalytic convertor doesn't cause the fuel to burn
> incompletely.
>
> http://autorepair.about.com/cs/gener...a080401a_3.htm
>
> Jeff
>
It's very simple. If the exhaust pressure is high the cylinder can not expel all
of the exhaust. If the exhaust system is plugged, where is the exhaust going to
go? No where it stays in the cylinder. Meaning you can not take in more fresh
air because the cylinder is already partially full or full. An engine in that
condition will have low vacuum and will run like its running out of fuel under
load and higher RPM's. It's basic science.

Jeff

"pick one" <try again!> wrote in message
news:Z4ydnfdlfsS84aXfRVn-rg@comcast.com...
>
> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
> news:4238399d$0$88042$16897aa@news.airnews.net...
>>
>> "pick one" <try again!> wrote in message
>> news:_LKdnTguhOF4vaXfRVn-vg@comcast.com...
>>>
>>> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
>>> news:4237bcbf$0$88040$16897aa@news.airnews.net...
>>
>> (...)
>>
>>>> I apologise. I was not clear enough. I meant if the catalytic
>>>> constricts the flow of exhaust without completely blocking the outflow.
>>>> The heat doesn't leave the engine as fast, causing overheating.
>>>>
>>>> Jeff
>>>>
>>> It will still not overheat the engine, simply because there is less
>>> oxygen fuel is not burning completely, less heat. If the cats can still
>>> do there job some what they may get real hot but the engine is starving
>>> and will not. The engine will be simply very low on power and act very
>>> much like it's running out of fuel at higher RPM's and under load.
>>
>> That's news to me. A bad catalytic convertor doesn't cause the fuel to
>> burn incompletely.
>>
>> http://autorepair.about.com/cs/gener...a080401a_3.htm
>>
>> Jeff
>>
> It's very simple. If the exhaust pressure is high the cylinder can not
> expel all of the exhaust. If the exhaust system is plugged, where is the
> exhaust going to go? No where it stays in the cylinder. Meaning you can
> not take in more fresh air because the cylinder is already partially full
> or full. An engine in that condition will have low vacuum and will run
> like its running out of fuel under load and higher RPM's. It's basic
> science.

And the heat won't be leaving the engine in the exhaust, either. It is basic
science.

pick one

"Jeff" <kidsdoc2000@hotmail.com> wrote in message
news:42389171$0$88044$16897aa@news.airnews.net...
>
> "pick one" <try again!> wrote in message
> news:Z4ydnfdlfsS84aXfRVn-rg@comcast.com...
>>
>> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
>> news:4238399d$0$88042$16897aa@news.airnews.net...
>>>
>>> "pick one" <try again!> wrote in message
>>> news:_LKdnTguhOF4vaXfRVn-vg@comcast.com...
>>>>
>>>> "Jeff" <kidsdoc2000@hotmail.com> wrote in message
>>>> news:4237bcbf$0$88040$16897aa@news.airnews.net...
>>>
>>> (...)
>>>
>>>>> I apologise. I was not clear enough. I meant if the catalytic constricts
>>>>> the flow of exhaust without completely blocking the outflow. The heat
>>>>> doesn't leave the engine as fast, causing overheating.
>>>>>
>>>>> Jeff
>>>>>
>>>> It will still not overheat the engine, simply because there is less oxygen
>>>> fuel is not burning completely, less heat. If the cats can still do there
>>>> job some what they may get real hot but the engine is starving and will
>>>> not. The engine will be simply very low on power and act very much like
>>>> it's running out of fuel at higher RPM's and under load.
>>>
>>> That's news to me. A bad catalytic convertor doesn't cause the fuel to burn
>>> incompletely.
>>>
>>> http://autorepair.about.com/cs/gener...a080401a_3.htm
>>>
>>> Jeff
>>>
>> It's very simple. If the exhaust pressure is high the cylinder can not expel
>> all of the exhaust. If the exhaust system is plugged, where is the exhaust
>> going to go? No where it stays in the cylinder. Meaning you can not take in
>> more fresh air because the cylinder is already partially full or full. An
>> engine in that condition will have low vacuum and will run like its running
>> out of fuel under load and higher RPM's. It's basic science.
>
> And the heat won't be leaving the engine in the exhaust, either. It is basic
> science.
>
>
How do you burn fuel with out oxygen? A plugged exhaust will not cause an over
heat.