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Old 09-08-2013, 01:22 PM   #1
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What a mess under this hood!!

Trying to help a close friend and "Boss" . I tried to shorten up this information, however I couldn't. I hope that this doesn't make you fall to sleep reading it, lol

Well, My Boss, whom is a close friend also, purchased a 1987 Jeep YJ
for his son , a few months ago. I am working on it for him, so his son will have a Jeep that will be somewhat dependable to drive, to a degree, if you know what I mean.

I will do my best to resolve some issues, with the help of others on this forum, that have the experience and know how, to guide me in any repairs, rerouting of vacuum lines, carburetor change out or rebuild, ect

I have been wrenching for a long time, however I am no Professional tech by any stretch of the imagination. I am familiar with a lot engines and have the mechanical ability to troubleshoot and repair most as long as I have done my research, and have the proper information, tools, money (his money) and time

I am trying to understand this nightmare of electrical and vacuum, and possibly running rich issues, the smell from exhaust is strong, sounds like a slight misfire that I can here, and I can put my finger in the exhaust tip, do a wipe, and get a heavy black soot finger....sounds like this part is rated "R" lol

" He says" "The Jeep will try and quit running, and sometimes it does, when he is backing down his driveway, which has a minor steepness to it"
also mentioned " When rocking the jeep from side to side by hand, it would stall out" however after i worked on it some yesterday, he tried the side to side shake, and it didn't stall out, however, that don't mean that I fixed it lol, it was on flat ground at my home.

The distributor vacuum advance, vacuum line, needs to go to a source that will allow the advanced to work properly, which I'm not sure where that need to go?. I have tested the mechanics of it and they appear to work when I put vacuum on the line

I know it needs distributor cap, rotor, plugs, wires, and possibly carb rebuild or just replace with a different brand. I have the equipment to do a compression test along with a cylinder leak down test, and electrical load test, however haven't got to that point yet. it is not at my home all the time for me to work on it

The Jeep has a I6, that looks pretty good on the surface, however it has a wiring mess, may have been "Nutter" if that is what it's called.

I feel like it is a electrical wiring nightmare at this point, also all the emissions components have been removed, except a few, from what I can see. The original carburetor has been replaced with a Holley 2 barrel which I have been trying to find the sweet spots on the mixture screws, which is not going to well. I think it needs a rebuild.

here are a few pics of the engine, some maybe a little dark. I asked him to take these for me this morning with his phone, of course I can get more detailed pics as needed, any information on it, about it, what it needs, moved, rerouted, ect will be appreciated, thanks for any help
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[IMG][/IMG]

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Old 09-08-2013, 01:46 PM   #2
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compared to how it looked originally with all the emissions the engine compartment looks pretty clean. pretty good chance the nutter was done, heres a thread on it so you can check.
This is a Picture Guide to Nutter Bypass - JeepForum.com

the thread will also tell you where to set the timing.
I would do a compression test to check the condition of the motor.

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Old 09-08-2013, 01:54 PM   #3
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thank you for that info
I will compile a list of info and items to check, for the next time I get the Jeep back down to my house
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Old 09-08-2013, 02:03 PM   #4
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That isn't a mess! It actually looks really neat and clean compared to what it looked like when it was stock.

The only thing I can see that is overkill and outta place is that garage door spring on the holley carb. lol.

The best way to tune a carb is with a vacuum gauge. Hook it to one of the ports that has vac. at an idle, and adjust to try and get between 18-22 inches of vacuum. The other port that has no vac. at idle is where you want to hook up the vac. advance hose.

Give it the tune-up that you were talking about. rebuild the carb. I wouldn't replace it, a Holley is one of the best carbs out there and cheap to rebuild. Not to mention simple to work on as well. After the rebuild. turn the metering screws in until they just touch. then back them out 1 1/2 turns each, this is a good place to start and test with the vacuum gauge. Then adjust accordingly.

That motor is designed for low end power, up to 2500 rpms. It wont rev high and doesn't have very much performance above that. But you can get plenty of performance out of it in the lower rpms. I have an 87 with a 4.2L, and although I have done a lot of work to mine, It will run with almost any other Jeep motor out there.
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Old 09-08-2013, 02:55 PM   #5
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Originally Posted by 0III0forlife View Post
That isn't a mess! It actually looks really neat and clean compared to what it looked like when it was stock.

The only thing I can see that is overkill and outta place is that garage door spring on the holley carb. lol.

The best way to tune a carb is with a vacuum gauge. Hook it to one of the ports that has vac. at an idle, and adjust to try and get between 18-22 inches of vacuum. The other port that has no vac. at idle is where you want to hook up the vac. advance hose.

Give it the tune-up that you were talking about. rebuild the carb. I wouldn't replace it, a Holley is one of the best carbs out there and cheap to rebuild. Not to mention simple to work on as well. After the rebuild. turn the metering screws in until they just touch. then back them out 1 1/2 turns each, this is a good place to start and test with the vacuum gauge. Then adjust accordingly.

That motor is designed for low end power, up to 2500 rpms. It wont rev high and doesn't have very much performance above that. But you can get plenty of performance out of it in the lower rpms. I have an 87 with a 4.2L, and although I have done a lot of work to mine, It will run with almost any other Jeep motor out there.
thank you for your input

I guess the mess I am refering to that you cant see, is wires just hanging, not properly tied, not bad cuts, exposed conductors ect. I would agree the engine bay looks good
I will ask to get a carb rebuild kit, and rebuild it for him. I do have a vacuum gauge, and almost forgot about using it in this situation of tuning the carburetor, thanks for reminding me to use that
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Old 09-09-2013, 10:51 AM   #6
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make sure there isn't any water in the gas. It will sputter and/or die on a hill if there is. Drygas in the tank will take care of this. Its a liquid, just named "drygas"
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Old 09-09-2013, 06:18 PM   #7
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make sure there isn't any water in the gas. It will sputter and/or die on a hill if there is. Drygas in the tank will take care of this. Its a liquid, just named "drygas"
thanks for the info. I didn't think about that maybe being an issue, makes sense though, worth a try

I have used "Denatured Alcohol" in the past, for drying up water in the gas tank. I will try this product you suggested if I can find it

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