hello,
I have posted here before about a nutter bypass issue i am having. i have tried everything and still no chance in the jeep starting. I have an 89 YJ with the mc2100 carb on it. I have done the TFI ignitionupgrade(new larger cap and rotor and new performance coil). After I did the carb swap I tried to do the nutter bypass. The jeep starts before i did this bypass but it runs like crap. when i did the bypass there is no starting. WHen i turn the key over it just turns over. It doesn't matter which way I turn the distributor(advancing it or not) it doesn't affect the way it turns over. It's like there is no spark. I have tken pics of what I did. I just can't post them. If someone needs them let me know and I can show you them. I soldered all the wires and taped them as well to make sure I was doing it right.
the module works fine because the jeep start and runs with no bypass done to it. I have been driving it with no butter bypass for the last 6 months. it just runs like crap. want to get this nutter bypass figured. everythings seems fine. after i did the nutter and it didn't start. I took the wires and put them back to stock. with everything sitting wright where it is in the pic(didn't move the mcu from fender ONLY changes wires) it started right up without hesitation. why would this be??
as far as the distributor positioning goes....i loosed the bolt and tried starting it with someone turning the dist(advancing it back and forth) not even a hint of engine firing. just keeps turning over and killing battery(good thing I got a good one)
please help!!!

Send me your pics..
BigJimM@Austin.RR.com

Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

The nutter bypass is a fix for the computer controlled carter bbd carb. The computer is a ford unit that is tied into the emissions system and basically opens and close what is called stepper motors on the carb. The nutter bypass eliminates the stepper motors. If you put an mc1200 carb you don,t need to do the bypass. Your post said when you put all the wires back the way they were your jeep started, go with that. Make sure you tape up the the hot wire that went to the stepper motor you don't want it shorting out and causing an underhood fire.

Sorry Green...but your answer is incorrect. The nutter frees the dist from the computer.. The computer not only controls the steppers it also controls the timing!!!
If the carb is changed the nutter is necessary!! Don't leave home without it.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

Thanks Jim <img src="/forums/images/graemlins/cheers.gif" alt="" />

Once all the wires are cut and all federal emissions equipment tampering laws are broken and then to top it off running dirtier than the oe rig was designed to do...is done..you want it to run well? maybe clean, maybe well enough to pass an emissions test (I know, you probably don't live where they do that) but we all should want to pollute as little as possible...

Now that you have mangled it, you might as well keep mangling. Get a DUI distributer (yes, spend MONEY!) do the rest of this right. This will eliminate the ignition problems, then call Howell (spend MORE money) and get a TBI system have a professional shop install it and be happy that it is all done correctly and is as clean running as possible. Please don't take this personaly, but a tech who knows what they are doing would never do the bypass in the first place. That OE BBD system works great if maintained.

JNutter and I had many long talks about this, the bottom line is..he tried to buy a new computer for his rig and it cost more than he wanted to spend, so he searched wrecking yards and found several used ones that still did not fix the problem, so he went around the system "bypassing it) NBP was born. His technique was not new, I did the distributer portion of the BP years before because the ECUs did not exist for certain old 83-84 cjs.
I always kept the stepper system intacked and never had one not pass an etest, when we were done.
Nutter always looked at it like all jeep owners are poor and can't spend any money building a jeep and that no time spent chasing parts in a wrecking yard was ever a waste of time. My argument is that if a qualified tech works on your vehicle Yugo to Benz you stand a better chance of having it done right and "most" DIYers. He thought that was wrong.

The bypass when done correctly will always pollute more than one with the oe system set up right, this is because the stepper motors is always set rich.



SD

follow this link to get to the pics. it's my post on a free pics posting site.

http://www.jeepkings.ca/forums/showthread.php?p=622798&posted=1#post622798

some ppl don't have the money to give to the tech guys. also some people like to learn stuff themselves. why buy a jeep if you aren't prepared to do work yourself. getting your hand dirty is all part of having a jeep, isn't it??
thanks

If making it run worse, resulting in polluting more, other types of repairs resulting in an unsafe vehicle to be on the highways or even trails is the result...Well, if you think your learning curve is worth that...speak up.

Techs like, teachers, doctors, truckers, union workers, non union workers...everyone does a job that somewhere along the like you or me pay them for a hard days work.

If being poor gives you the "right" to tamper with federal pollution equipment and create a polluting rig because you can't afford proper repairs....take the bus, walk.

SD
If you spend some good money on good repairs we all do better.

I put the Weber carb on my girls 89 wrangler , and after some minor adjustments it runs purrfect.... I was just wonderin why you didn't go with the Weber ?

Usually the answer would be price and rebuild kits... Your carb is a pain to rebuild and his is maybe the easiest in the history of carbs..
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />