My '78 cj5 258 has not had a functioning EGR valve since I've owned
the vehicle. Every year I am replacing the vacuum lines and plugs on
the carb because they get brittle and crack, which ends up with
backfires, rough idles ect... I was told that because the EGR is not
hooked up, the combustion temps are very high, which makes the exhaust
manifold excessively hot. The excessive heat is drying out the lines
and plugs. Sounds feasable, from what I've read the EGR is supposed
to bring down the combustion temps. I can put a new EGR on simple
enough. I do not have to meet any emissions requirements anymore
because the jeep is 25+ years old. Is this something I should do, or
will it not make a difference? If I do put a new one on will I have
to have the carburetor re-adjusted?

 

"GaryZ" <gfzalar@hotmail.com> wrote in message
news:325774ee.0406210955.105e35e6@posting.google.c om...
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

By cooling down the cumbustion temps, you will reduce the willingness
to ping. If you are not pinging now, with a functional EGR valve, you
would likely be able to advance your timing and get better mileage
and performance. I'd do it. I doubt you'd have to re-jet, in that
the carb should have the proper jets for a functioning EGR valve.

 

"GaryZ" <gfzalar@hotmail.com> wrote in message
news:325774ee.0406210955.105e35e6@posting.google.c om...
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

By cooling down the cumbustion temps, you will reduce the willingness
to ping. If you are not pinging now, with a functional EGR valve, you
would likely be able to advance your timing and get better mileage
and performance. I'd do it. I doubt you'd have to re-jet, in that
the carb should have the proper jets for a functioning EGR valve.

 

"GaryZ" <gfzalar@hotmail.com> wrote in message
news:325774ee.0406210955.105e35e6@posting.google.c om...
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

By cooling down the cumbustion temps, you will reduce the willingness
to ping. If you are not pinging now, with a functional EGR valve, you
would likely be able to advance your timing and get better mileage
and performance. I'd do it. I doubt you'd have to re-jet, in that
the carb should have the proper jets for a functioning EGR valve.

 

"GaryZ" <gfzalar@hotmail.com> wrote in message
news:325774ee.0406210955.105e35e6@posting.google.c om...
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

By cooling down the cumbustion temps, you will reduce the willingness
to ping. If you are not pinging now, with a functional EGR valve, you
would likely be able to advance your timing and get better mileage
and performance. I'd do it. I doubt you'd have to re-jet, in that
the carb should have the proper jets for a functioning EGR valve.

 

I wouldn't replace it, all the Exhaust Gases Recirculation does is
pour carbon particles back through your engine that you're trying to
keep out, and of course lean it out on deceleration. I'm required to
have one, but as you can see it's not checked to see if it works, and
mine doesn't: http://www.----------.com/smog.jpg Just make sure it not
sticking and leaking exhaust into your intake manifold at idle.
God Bless America, ßill O|||||||O
mailto:--------------------

GaryZ wrote:
>
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

 

I wouldn't replace it, all the Exhaust Gases Recirculation does is
pour carbon particles back through your engine that you're trying to
keep out, and of course lean it out on deceleration. I'm required to
have one, but as you can see it's not checked to see if it works, and
mine doesn't: http://www.----------.com/smog.jpg Just make sure it not
sticking and leaking exhaust into your intake manifold at idle.
God Bless America, ßill O|||||||O
mailto:--------------------

GaryZ wrote:
>
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

 

I wouldn't replace it, all the Exhaust Gases Recirculation does is
pour carbon particles back through your engine that you're trying to
keep out, and of course lean it out on deceleration. I'm required to
have one, but as you can see it's not checked to see if it works, and
mine doesn't: http://www.----------.com/smog.jpg Just make sure it not
sticking and leaking exhaust into your intake manifold at idle.
God Bless America, ßill O|||||||O
mailto:--------------------

GaryZ wrote:
>
> My '78 cj5 258 has not had a functioning EGR valve since I've owned
> the vehicle. Every year I am replacing the vacuum lines and plugs on
> the carb because they get brittle and crack, which ends up with
> backfires, rough idles ect... I was told that because the EGR is not
> hooked up, the combustion temps are very high, which makes the exhaust
> manifold excessively hot. The excessive heat is drying out the lines
> and plugs. Sounds feasable, from what I've read the EGR is supposed
> to bring down the combustion temps. I can put a new EGR on simple
> enough. I do not have to meet any emissions requirements anymore
> because the jeep is 25+ years old. Is this something I should do, or
> will it not make a difference? If I do put a new one on will I have
> to have the carburetor re-adjusted?

 

On 21 Jun 2004 10:55:57 -0700, gfzalar@hotmail.com (GaryZ) wrote:

>My '78 cj5 258 has not had a functioning EGR valve since I've owned
>the vehicle. Every year I am replacing the vacuum lines and plugs on
>the carb because they get brittle and crack, which ends up with
>backfires, rough idles ect... I was told that because the EGR is not
>hooked up, the combustion temps are very high, which makes the exhaust
>manifold excessively hot. The excessive heat is drying out the lines
>and plugs. Sounds feasable, from what I've read the EGR is supposed
>to bring down the combustion temps. I can put a new EGR on simple
>enough. I do not have to meet any emissions requirements anymore
>because the jeep is 25+ years old. Is this something I should do, or
>will it not make a difference? If I do put a new one on will I have
>to have the carburetor re-adjusted?

In my day, we didn't have no *FANCY* _E_ _G_ _R_... By cracky, we
didn't even have no *FANCY* cat-a-lytic converters or _mufflers_. We
dumped raw, unmuffled exhaust gasses into the air and breathed deeply
of them in-between puffs off of unfiltered Lucky Strike cigarettes and
shots of corn whiskey chased with tequilla and WE LIKED IT! Our
engines sucked in air and fossil fuel and BURNED it and spat out nasty
by-products and we absolutely LOVED it. :-D

--

Less drivel, more Dremel.
Always carry a flagon of whiskey in case of snakebite,
and furthermore always carry a small snake.
- W.C. Fields

 

On 21 Jun 2004 10:55:57 -0700, gfzalar@hotmail.com (GaryZ) wrote:

>My '78 cj5 258 has not had a functioning EGR valve since I've owned
>the vehicle. Every year I am replacing the vacuum lines and plugs on
>the carb because they get brittle and crack, which ends up with
>backfires, rough idles ect... I was told that because the EGR is not
>hooked up, the combustion temps are very high, which makes the exhaust
>manifold excessively hot. The excessive heat is drying out the lines
>and plugs. Sounds feasable, from what I've read the EGR is supposed
>to bring down the combustion temps. I can put a new EGR on simple
>enough. I do not have to meet any emissions requirements anymore
>because the jeep is 25+ years old. Is this something I should do, or
>will it not make a difference? If I do put a new one on will I have
>to have the carburetor re-adjusted?

In my day, we didn't have no *FANCY* _E_ _G_ _R_... By cracky, we
didn't even have no *FANCY* cat-a-lytic converters or _mufflers_. We
dumped raw, unmuffled exhaust gasses into the air and breathed deeply
of them in-between puffs off of unfiltered Lucky Strike cigarettes and
shots of corn whiskey chased with tequilla and WE LIKED IT! Our
engines sucked in air and fossil fuel and BURNED it and spat out nasty
by-products and we absolutely LOVED it. :-D

--

Less drivel, more Dremel.
Always carry a flagon of whiskey in case of snakebite,
and furthermore always carry a small snake.
- W.C. Fields