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Old 10-18-2013, 04:45 PM   #1
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1987 YJ help

I recently bought my first jeep. What I thought to be a great buy turned out to be not as good as I thought. I've already fixed several problems but here a few that I can't find a straight forward answer to. It burns a decent amount of oil and on start up black soot blows out of the exhaust and leaves a mark on the ground. Another problem that has started recently is a terrible squeal coming from the motor when in neutral and given gas. I have other problems as well but these are the ones I need to get out of the way ASAP. Any help would be greatly appreciated.

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Old 10-18-2013, 06:37 PM   #2
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belt squeal? is it a manual transmission? black soot could be running very rich. is it a carb or is it the 4 cylinder fuel injected? clogged catylic converter can cause lots of soot. cat could be clogged up and blowing out the soot. the jeep is still probably running rich. the cat got clogged up somehow if it is clogged up.

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Old 10-18-2013, 06:47 PM   #3
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could be bad rings...russ
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Old 10-18-2013, 06:56 PM   #4
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Pull the plugs and read them after it has warmed up. Do a compression test you are looking for 150 +-10 on all cylinders. That will tell what kind of shape the engine is in and how it is firing.

Then post up some info and results and see what you get for answers.

Running rich at start is common but it may need a tune-up or something more.

The burning oil could be valve guides/seals or rings or a combination of both.

Not sure how to do a compression test use YouTube great videos.
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Old 10-18-2013, 07:16 PM   #5
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It is Carb, manual trans. If I replace the o2 sensor should it solve the problem if it is running too rich? And if the cat is clogged what do I do about it? But for the squeal, it sounds as if it is coming from the front of the motor. Idk what would of made it start all of a sudden
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Old 10-18-2013, 08:40 PM   #6
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Is it still the stock Carter carb? They are notorius for being a POS. Usually they cause stumbling and stalling. Are you having any of that? How many miles are on your engine?

The squeel definately sounds like it us from your belt, possibly something is locking up causing it. Take the belt off and make sure all of the pulleys turn freely.
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Old 10-18-2013, 08:44 PM   #7
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The previous owner told me he replaced the engine so I have no clue how many miles are on that motor. But I do believe it is stock carb. But it runs fine and have no problems, it just blows soot and burns oil. But I will check all the pulleys and see if that fixes it
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Old 10-18-2013, 08:55 PM   #8
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is it still the 4.2 or did he put a newer 4.0 in it?
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Old 10-18-2013, 09:05 PM   #9
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I honestly couldn't tell you. I've done some googling and people say that the newer 4.0 are fuel injected and the 4.2s are carbed. Mine is carbed so I'm assuming its still a 4.2
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Old 10-18-2013, 10:19 PM   #10
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The squeal might be coming from the alternator, AC compressor, or just the belt. A worn out timing chain can make noises also, but it's usually more of a grinding noise. As mentioned remove the belt, check it for obvious wear, and make sure everything turns freely. Take a picture of the engine, post it, and we can tell you what you have. If the cat is clogged I have been told it will smell like rotten eggs and/or the cat will get abnormally hot. I have never had one go bad. Finally, replacing the O2 sensor may or may not correct the problem. There are several variables that could be causing the problem. How handy are you working with cars?
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Old 10-18-2013, 10:32 PM   #11
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Ok I'll make sure to check everything out. Not very handy but me and my dad can usually take care of everything we need to work on thanks to YouTube. He's had a jeep since he was 16 and he just recently put his in the shop 3 weeks ago for the 1st time since he's owned it

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