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Old 04-19-2014, 07:07 PM   #1
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no power in third gear

Got the new mc2150 on today. Yes, I admit it, I didn't touch the timing or anything just threw it on.
Also did new thermostat, radiator and hoses. Paracord door limiters, door pulls and oh sh!t handles as well as fabricated the hi lift jack mount. So I'm burnt out.
Anyway Jeeps running good until you try to go up a hill in third gear. You can put the pedal to the floor and it just keeps slowing down. You have to down shift to keep going. It runs like a top over 40 MPH (4th and 5th).
I'm just too exhausted to really think about it right now. I assume it's a timing or exhaust issue.
Any input?
Thanks.

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Old 04-21-2014, 07:09 AM   #2
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Nobody?

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Old 04-21-2014, 12:49 PM   #3
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For starters:
  1. Check the timing.
  2. Tune the carb.
  3. Adjust the vacuum advance.
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Old 04-21-2014, 05:59 PM   #4
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So nobody here knows the carb well enough to diagnose the issue?
With no carb experience I was able to research and diagnose to the problem with the last one (verified and replaced by gronk).
The amount of knowledgeable answers seems to be lacking here lately especially when it comes to yj's. What's up with that?
I see an endless supply of half a$$ed answers for newer Jeep owners while the guys that don't rely on dealerships hit the wayside.
I have no issue with filling the niche as my knowledge grows but I'd be seriously concerned if I had just found the forum.

How exactly do I adjustment the vacuum advance?
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Old 04-22-2014, 07:17 AM   #5
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Originally Posted by 90yjnc View Post
How exactly do I adjustment the vacuum advance?
This is usually tied to the Distributor position. There should be a locking bolt that holds the distributor in position. Loosen this and the you can rotate clockwise to advance or counter clockwise to recede the vacuum timing.
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Old 04-22-2014, 07:19 AM   #6
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Upon thinking, I may have clockwise and counter clockwise reversed. You can start the jeep, loosen the nut, then rotate the distributor one way to see if the issue improves or worsens. If worsens, then rotate the opposite way.
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Old 04-22-2014, 07:34 AM   #7
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Got ya. Thanks man.
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Old 04-22-2014, 07:42 AM   #8
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Quote:
Originally Posted by Rlhoffman View Post
This is usually tied to the Distributor position. There should be a locking bolt that holds the distributor in position. Loosen this and the you can rotate clockwise to advance or counter clockwise to recede the vacuum timing.
Rotating the distributor adjusts the base timing not the vacuum advance. To adjust the vacuum advance you need to pull the vacuum line off of the distributor and there will be an Allen screw in there. Rotate this Allen screw to adjust the vacuum advance.
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Old 04-22-2014, 08:02 AM   #9
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DOH!, Thanks for the correction Fabrokoner. Anyways, re-reading the OP I don't think is vacuum advance. The vacuum advance only engages during acceleration. The issue is going uphill he loses power and slows down. Vacuum advance would have hestiation during acceleration even on flat pavement. This sounds to me more like a fuel delivery problem. Maybe a bad or stuck float in the carb, or weak fuel pump.
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Old 04-22-2014, 08:05 AM   #10
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I think nonrubicon #2 tip is right. Get a carb rebuild kit. I wonder if you have manual or electric choke. Could be loose and partially closing on uphill incline? Regardless, you are still getting spark so it has to be fuel or air.
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Old 04-22-2014, 08:35 AM   #11
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Adjusting the vacuum advance is totally new to me. I didn't know you could do that. That may be extremely helpful information. I'll definitely be checking the timing this weekend.
I refuse to buy a rebuild kit. This is the second carb that I got from Gronk. The first one wouldn't work. This one has to. I need this thing running right by June 1st so I can move to NC or I'll be homeless.
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Old 04-22-2014, 02:47 PM   #12
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Originally Posted by 90yjnc View Post
Adjusting the vacuum advance is totally new to me. I didn't know you could do that. That may be extremely helpful information. I'll definitely be checking the timing this weekend. I refuse to buy a rebuild kit. This is the second carb that I got from Gronk. The first one wouldn't work. This one has to. I need this thing running right by June 1st so I can move to NC or I'll be homeless.
If the carb is brand new then it probably needs to be dialed in and not rebuilt. I'd start by dialing in the carb and setting the timing. These two are interrelated as they affect one another and should be done at the same time.

Here is a very good article on vacuum advance, it cleared up a lot of stuff for me. There is much misinformation around on the subject.

http://www.corvetteactioncenter.com/...m-advance.html
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Old 04-22-2014, 04:14 PM   #13
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Great article thanks.
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Old 04-22-2014, 08:15 PM   #14
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Not everyone here wants the full spiel, so I don't go into details all the time in my first reply. Since I wasn't clear enough with my initial reply, here's the rationale in the full spiel:

#1. Checking the timing and adjusting it is always appropriate when you install a new fuel delivery system, or when you make adjustments to it. Yes, even if you swap a carb for the exact same model carb. Unlike modern fuel injected engines, your motorcraft carb setup in your YJ does not use a computer to set and adjust the timing.

#2. You admit that you simply threw the carb on. This is not computerized fuel injection that self adjusts. Whenever you put on a new carb NEVER assume it is properly tuned for your vehicle just because the engine will run. It may be tuned decently enough to run well enough on some other dude's 4.2L, but it may not be exactly right for your individual engine. Yes, your engine is a unique little butterfly with it's own unique wear and tear. Thus it is important to verify the tune and adjust it if necessary. It may be perfect right from the start, it may not be. But until you verify the tune is correct you have an unknown. Hence why I said verify the tune of the carb. Have to adjust something on it like the fuel mix or the idle? - See #1 above.

And timing once again...

#3. Vacuum advance. Whether ported or manifold, vacuum advance affects the timing when under load. You need to make sure you have it set up correctly. You read the linked article. Not much else for me to add.


These are initial things that I would do, given the scenario presented.

This of course is assuming that there is nothing internally wrong (or out of adjustment) with the carb. And yes, Virginia, you can indeed get two bunk carbs in a row. Oh, and there is no Santa Clause. Sorry.

A reminder - NOBODY HERE IS OBLIGATED TO HELP YOU. This forum is populated by individual Jeep owners who want to help each other. We are not necessarily employees of Jeep, nor all professional mechanics. Members here choose to help others, or try as best they can by sharing what knowledge they can. Don't get your shorts in a bunch when you don't get the exact answer you want right when you want it. A reply is still a reply and bumps a post to the top, giving your question more exposure to members who might not have seen it otherwise. Complaining about the lack of technical knowledge of the members and lack of members who have had direct experience with the exact problem you are having isn't going to magically turn this forum into a technical library of unlimited knowledge for all things YJ.

Various forums attract different levels of technical knowledge. If this forum doesn't suffice, try elsewhere.
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Old 04-23-2014, 01:41 AM   #15
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a reminder - nobody here is obligated to help you. This forum is populated by individual jeep owners who want to help each other. We are not necessarily employees of jeep, nor all professional mechanics. Members here choose to help others, or try as best they can by sharing what knowledge they can. Don't get your shorts in a bunch when you don't get the exact answer you want right when you want it. A reply is still a reply and bumps a post to the top, giving your question more exposure to members who might not have seen it otherwise. Complaining about the lack of technical knowledge of the members and lack of members who have had direct experience with the exact problem you are having isn't going to magically turn this forum into a technical library of unlimited knowledge for all things yj. Various forums attract different levels of technical knowledge. If this forum doesn't suffice, try elsewhere.
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Old 04-23-2014, 05:33 AM   #16
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A reminder - NOBODY HERE IS OBLIGATED TO HELP YOU.
Various forums attract different levels of technical knowledge. If this forum doesn't suffice, try elsewhere.
You could always take my philosophy:
My (your) Jeep is a piece of crap. I (you) bought it, I (you) own it. Ask for help if you need it, if you get none, figure it out. It is your problem, not mine. You shouldn't complain if you can't find the help you are looking for. Or if it pisses you off enough, get rid of it.

People always say how easy YJ's are to work on. I am a mechanic, and compared to a modern BMW, they are. If you have NO mechanical ability, they are not. It is all relative. A 25 year old Briggs & Stratton is easy to work on compared to a YJ unless….well you know!

As far as getting 2 bad carbs. If they are used, you may get 10 bad ones. It is USED!
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Old 04-23-2014, 06:27 AM   #17
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You're absolutely right. Nobody here is obligated to help anyone. With my lack of knowledge I do my best to help whenever I can. I scan the forum and try to make sure everyone gets a response and do my best to report spam to make life easier for the mods.
I've noticed one or two people who are always looking to help, oIIIo for example.
My negative response wasn't directly targeted at you, it was more of an observation of where the forum is lacking. A supporting member chiming in to hooah "nobody needs to help you" without offering the slightest bit of helpful input doesn't exactly reflect well on the forum.
Personally I'd like to see the forum bring in more supporting members and grow.
I do appreciate all the help everyone has given me and I hope to expand my knowledge base and return that help 10 fold, hopefully expanding membership in the process.
BTW I really enjoyed your full spiel.
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Old 04-23-2014, 09:42 AM   #18
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You're absolutely right. Nobody here is obligated to help anyone. With my lack of knowledge I do my best to help whenever I can. I scan the forum and try to make sure everyone gets a response and do my best to report spam to make life easier for the mods. I've noticed one or two people who are always looking to help, oIIIo for example. My negative response wasn't directly targeted at you, it was more of an observation of where the forum is lacking. A supporting member chiming in to hooah "nobody needs to help you" without offering the slightest bit of helpful input doesn't exactly reflect well on the forum. Personally I'd like to see the forum bring in more supporting members and grow. I do appreciate all the help everyone has given me and I hope to expand my knowledge base and return that help 10 fold, hopefully expanding membership in the process. BTW I really enjoyed your full spiel.
You admitted in your original post that you installed a "new" carb and did nothing to it. Then you wanted to know why your Jeep didn't run right and got mad because no one responded. It seemed pretty obvious to me why your Jeep wasn't running right. I thought Non-Rubicon's response was spot on, that's why I gave him the thumb's up, and the picture was a joke to him, because he likes to post silly pictures. I am a supporting member because I pay my subscription dues, not because I'm knowledgeable. I read through many different posts to educate myself about my Jeep, and I offer help when I can. The only help I could have offered you was to suggest that you take it to shop that's knowledgable about carbs. That's what I do. You say you'd like to see the forum bring in more supporting members, but are you one? I suspect that since you have "Jeeper" in your avatar that you do not have a paid subscription. If you want to see this forum prosper, I suggest that you pay for a subscription and encourage others to do the same.

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