Re: CJ 7 Carb Problems
 

I would be thinking about using something like JB Weld to fix them in
place or if I had access to the tools to test mix I might think about
pulling the pins and blocking the air passages like Bruce did.

I am going to play with my pins a bit more as soon as it thaws or I do
the next highway run to get camping so I can follow up where I have them
set finally if you would like.

Just FYI I have grabbed the stepper main shaft with small vise grips and
rocked it in and out to free them up before. It moves in steps
literally and can take some pushing or rocking in and out.

Mike

RoyJ wrote:
> My pins are on the end of a "ball screw" that is attached to the stepper
> motor. Motor is jammed, I have no way of spinning it to make any
> adjustments.
>
> Mike Romain wrote:
>> The pins move in steps. They rock. From the top I can be persistent
>> with a mini screwdriver and get them to rock or I have taken off the
>> stepper and made them move that way. Once 'moving', they seem to stay
>> so the screwdriver can get it. Or I just plain got lucky with the
>> screwdriver and it needs to be opened. I didn't have needle nose
>> pliers needly enough to grab from the top.
>>
>> Mike
>>
>> RoyJ wrote:
>>
>>> Hey Mike:
>>> How do you adjust (and hold!) the stepper pin location if the stepper
>>> motor is jammed?
>>>
>>> Mike Romain wrote:
>>>
>>>> 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)

Re: CJ 7 Carb Problems
 

I would be thinking about using something like JB Weld to fix them in
place or if I had access to the tools to test mix I might think about
pulling the pins and blocking the air passages like Bruce did.

I am going to play with my pins a bit more as soon as it thaws or I do
the next highway run to get camping so I can follow up where I have them
set finally if you would like.

Just FYI I have grabbed the stepper main shaft with small vise grips and
rocked it in and out to free them up before. It moves in steps
literally and can take some pushing or rocking in and out.

Mike

RoyJ wrote:
> My pins are on the end of a "ball screw" that is attached to the stepper
> motor. Motor is jammed, I have no way of spinning it to make any
> adjustments.
>
> Mike Romain wrote:
>> The pins move in steps. They rock. From the top I can be persistent
>> with a mini screwdriver and get them to rock or I have taken off the
>> stepper and made them move that way. Once 'moving', they seem to stay
>> so the screwdriver can get it. Or I just plain got lucky with the
>> screwdriver and it needs to be opened. I didn't have needle nose
>> pliers needly enough to grab from the top.
>>
>> Mike
>>
>> RoyJ wrote:
>>
>>> Hey Mike:
>>> How do you adjust (and hold!) the stepper pin location if the stepper
>>> motor is jammed?
>>>
>>> Mike Romain wrote:
>>>
>>>> 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)