CJ 7 Carb Problems
02-23-2007, 09:12 AM
#11
Guest
Posts: n/a
Re: CJ 7 Carb Problems
My vote is for the "stepper motor" enrichment system also! When
built, they were worried about NOX emissions caused by lean
mixtures. That stepper dumps fuel into the carb when the Oxygen
Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
of vacuum lines that operate everything, you may never find it.
A thread tap and a couple of set screws blocking the enrichment system
permanently cured mine while keeping everything under the hood looking
"correct". I had 30 years experience with the Carter BBD and they
always ran flawlessly, so I knew there was a "monkey in the works"
somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
their design by adding that stepper . After the "retro"
modification, my jeep now runs absolutely perfect. Instant starts
hot or cold, 20 mph in high gear and you can floor the accelerator and
get a smooth speed up. And running 65 to 75 on the Interstate, it
gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
the top off-Yeah!) so that is verified mileage.
Another good modification that is also reversable if you ever need to
is the "Nutter Bypass", it completely "retros" your ignition to the
reliably simple 70's version.
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
Be sure to take a look at the diagrams shown on the above webpage.
Good luck, Bruce
02-23-2007, 09:12 AM
#12
Guest
Posts: n/a
Re: CJ 7 Carb Problems
My vote is for the "stepper motor" enrichment system also! When
built, they were worried about NOX emissions caused by lean
mixtures. That stepper dumps fuel into the carb when the Oxygen
Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
of vacuum lines that operate everything, you may never find it.
A thread tap and a couple of set screws blocking the enrichment system
permanently cured mine while keeping everything under the hood looking
"correct". I had 30 years experience with the Carter BBD and they
always ran flawlessly, so I knew there was a "monkey in the works"
somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
their design by adding that stepper . After the "retro"
modification, my jeep now runs absolutely perfect. Instant starts
hot or cold, 20 mph in high gear and you can floor the accelerator and
get a smooth speed up. And running 65 to 75 on the Interstate, it
gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
the top off-Yeah!) so that is verified mileage.
Another good modification that is also reversable if you ever need to
is the "Nutter Bypass", it completely "retros" your ignition to the
reliably simple 70's version.
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
Be sure to take a look at the diagrams shown on the above webpage.
Good luck, Bruce
02-23-2007, 09:12 AM
#13
Guest
Posts: n/a
Re: CJ 7 Carb Problems
My vote is for the "stepper motor" enrichment system also! When
built, they were worried about NOX emissions caused by lean
mixtures. That stepper dumps fuel into the carb when the Oxygen
Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
of vacuum lines that operate everything, you may never find it.
A thread tap and a couple of set screws blocking the enrichment system
permanently cured mine while keeping everything under the hood looking
"correct". I had 30 years experience with the Carter BBD and they
always ran flawlessly, so I knew there was a "monkey in the works"
somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
their design by adding that stepper . After the "retro"
modification, my jeep now runs absolutely perfect. Instant starts
hot or cold, 20 mph in high gear and you can floor the accelerator and
get a smooth speed up. And running 65 to 75 on the Interstate, it
gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
the top off-Yeah!) so that is verified mileage.
Another good modification that is also reversable if you ever need to
is the "Nutter Bypass", it completely "retros" your ignition to the
reliably simple 70's version.
http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
Be sure to take a look at the diagrams shown on the above webpage.
Good luck, Bruce
02-23-2007, 09:51 AM
#14
Guest
Posts: n/a
Re: CJ 7 Carb Problems
Where did you set the stepper pins at?
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
02-23-2007, 09:51 AM
#15
Guest
Posts: n/a
Re: CJ 7 Carb Problems
Where did you set the stepper pins at?
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
02-23-2007, 09:51 AM
#16
Guest
Posts: n/a
Re: CJ 7 Carb Problems
Where did you set the stepper pins at?
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
I started to do an experiment with my BBD, then got smashed up in a car
accident and forgot I started it until I did a trip and realized I was
only getting about 12 mpg with it.
I was intentionally running the stepper pins in the full rich position
like the 'Nutter' bypass says also to try and keep it rich so it 'might'
burn that alcohol mix crap. It still won't burn the mixed ----.
Anyway, I remembered about this experiment at the end of a trip and went
back and adjusted the stepper pins to the middle of their travel like
they would run with the stepper and O2 working perfect. This has the
shoulder of the pin just sticking out from the back wall of the carb
where the carbon stain is located from when the stepper worked.
This radically boosted my high speed power back up and got my mileage
back to over 20 mpg highway or close to 11L /100 km.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Highcountry wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
>
02-23-2007, 01:38 PM
#17
Guest
Posts: n/a
Re: CJ 7 Carb Problems
On Feb 23, 8:12 am, "Highcountry" <highcountry2...@hotmail.com> wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
02-23-2007, 01:38 PM
#18
Guest
Posts: n/a
Re: CJ 7 Carb Problems
On Feb 23, 8:12 am, "Highcountry" <highcountry2...@hotmail.com> wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
02-23-2007, 01:38 PM
#19
Guest
Posts: n/a
Re: CJ 7 Carb Problems
On Feb 23, 8:12 am, "Highcountry" <highcountry2...@hotmail.com> wrote:
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
> My vote is for the "stepper motor" enrichment system also! When
> built, they were worried about NOX emissions caused by lean
> mixtures. That stepper dumps fuel into the carb when the Oxygen
> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
> of vacuum lines that operate everything, you may never find it.
>
> A thread tap and a couple of set screws blocking the enrichment system
> permanently cured mine while keeping everything under the hood looking
> "correct". I had 30 years experience with the Carter BBD and they
> always ran flawlessly, so I knew there was a "monkey in the works"
> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
> their design by adding that stepper . After the "retro"
> modification, my jeep now runs absolutely perfect. Instant starts
> hot or cold, 20 mph in high gear and you can floor the accelerator and
> get a smooth speed up. And running 65 to 75 on the Interstate, it
> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
> the top off-Yeah!) so that is verified mileage.
>
> Another good modification that is also reversable if you ever need to
> is the "Nutter Bypass", it completely "retros" your ignition to the
> reliably simple 70's version.
>
> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>
> Be sure to take a look at the diagrams shown on the above webpage.
>
> Good luck, Bruce
This sounds like a solution. I will take advantage of it this weekend.
It has to be better than the performance that I'm getting now. Thanks
for your advice, Andy
02-23-2007, 02:15 PM
#20
Guest
Posts: n/a
Re: CJ 7 Carb Problems
a.limberg@insightbb.com wrote:
> On Feb 23, 8:12 am, "Highcountry" <highcountry2...@hotmail.com> wrote:
>> My vote is for the "stepper motor" enrichment system also! When
>> built, they were worried about NOX emissions caused by lean
>> mixtures. That stepper dumps fuel into the carb when the Oxygen
>> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
>> of vacuum lines that operate everything, you may never find it.
>>
>> A thread tap and a couple of set screws blocking the enrichment system
>> permanently cured mine while keeping everything under the hood looking
>> "correct". I had 30 years experience with the Carter BBD and they
>> always ran flawlessly, so I knew there was a "monkey in the works"
>> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
>> their design by adding that stepper . After the "retro"
>> modification, my jeep now runs absolutely perfect. Instant starts
>> hot or cold, 20 mph in high gear and you can floor the accelerator and
>> get a smooth speed up. And running 65 to 75 on the Interstate, it
>> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
>> the top off-Yeah!) so that is verified mileage.
>>
>> Another good modification that is also reversable if you ever need to
>> is the "Nutter Bypass", it completely "retros" your ignition to the
>> reliably simple 70's version.
>>
>> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>>
>> Be sure to take a look at the diagrams shown on the above webpage.
>>
>> Good luck, Bruce
>
> This sounds like a solution. I will take advantage of it this weekend.
> It has to be better than the performance that I'm getting now. Thanks
> for your advice, Andy
>
Here is another link on that mod:
http://home.sprynet.com/~dale02/ignmods.htm
I have a couple comments about it. I always just run 2 new wires to
connect the orange and purple wires at the ignition module to the
distributor rather than mess around inside the harness.
I disagree with John Nutter's carb setup. He states to put the stepper
motor's 'air mix' pins into the full rich position or all the way into
the carb. This basically doesn't work for high speed, it only works for
idle and low speeds.
I have found that setting the pins in the center of their travel where
the O2 would have them gets the top speed mix right. This means rocking
them with a small screwdriver until the shoulder of the pin is just
clear of the back wall or removing the stepper and moving them by hand
then putting it back on.
The idle mix is controlled by two screws down front.
You will love the power boost! A good 25% 'seat of the pants boost with
at 'least' a 10 mph per gear increase. My 86 will top out at 4400 rpm
now. 4th gear will bury the speedo and I have no urge to find out how
fast 5th will go...
I can also pass Canadian emissions with the BBD manually tuned. Not
just mine but a lot of friend's rigs too.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
> On Feb 23, 8:12 am, "Highcountry" <highcountry2...@hotmail.com> wrote:
>> My vote is for the "stepper motor" enrichment system also! When
>> built, they were worried about NOX emissions caused by lean
>> mixtures. That stepper dumps fuel into the carb when the Oxygen
>> Sensor detects lean mixture. On a 25 year old vehicle with 100 feet
>> of vacuum lines that operate everything, you may never find it.
>>
>> A thread tap and a couple of set screws blocking the enrichment system
>> permanently cured mine while keeping everything under the hood looking
>> "correct". I had 30 years experience with the Carter BBD and they
>> always ran flawlessly, so I knew there was a "monkey in the works"
>> somewhere. Sure enough, good old Uncle EPA forced Carter to ruin
>> their design by adding that stepper . After the "retro"
>> modification, my jeep now runs absolutely perfect. Instant starts
>> hot or cold, 20 mph in high gear and you can floor the accelerator and
>> get a smooth speed up. And running 65 to 75 on the Interstate, it
>> gets 15 to 16 MPG. I just did a 200 mile round trip yesterday (with
>> the top off-Yeah!) so that is verified mileage.
>>
>> Another good modification that is also reversable if you ever need to
>> is the "Nutter Bypass", it completely "retros" your ignition to the
>> reliably simple 70's version.
>>
>> http://www.4x4wire.com/jeep/tech/ele...jn-ignition99/
>>
>> Be sure to take a look at the diagrams shown on the above webpage.
>>
>> Good luck, Bruce
>
> This sounds like a solution. I will take advantage of it this weekend.
> It has to be better than the performance that I'm getting now. Thanks
> for your advice, Andy
>
Here is another link on that mod:
http://home.sprynet.com/~dale02/ignmods.htm
I have a couple comments about it. I always just run 2 new wires to
connect the orange and purple wires at the ignition module to the
distributor rather than mess around inside the harness.
I disagree with John Nutter's carb setup. He states to put the stepper
motor's 'air mix' pins into the full rich position or all the way into
the carb. This basically doesn't work for high speed, it only works for
idle and low speeds.
I have found that setting the pins in the center of their travel where
the O2 would have them gets the top speed mix right. This means rocking
them with a small screwdriver until the shoulder of the pin is just
clear of the back wall or removing the stepper and moving them by hand
then putting it back on.
The idle mix is controlled by two screws down front.
You will love the power boost! A good 25% 'seat of the pants boost with
at 'least' a 10 mph per gear increase. My 86 will top out at 4400 rpm
now. 4th gear will bury the speedo and I have no urge to find out how
fast 5th will go...
I can also pass Canadian emissions with the BBD manually tuned. Not
just mine but a lot of friend's rigs too.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
