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Unread 09-06-2010, 01:20 AM   #1
Steev89
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Bolt falling out of engine?

Hi, First off Im new here so please correct me if I have made a mistake in posting or any other such mistake.

Now for my question. I have a 99 Jeep Cherokee and a bold has fallen off of the engine making it be extremely loud. This happened once before and I found where the bolt went and tightened it back in the engine but it recently fell out again. I was wondering if anyone had any suggestions on what to do about this bolt falling out so often, and also what the bolt is even for. I have a haynes manual and i could not find any information about it at all. The bolt is on the lower part of the engine on the drivers side. Thank you for your time I really appreciate it.

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Unread 09-06-2010, 02:38 AM   #2
1990JEEPXJ
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where does it bolt on? can you take a picture of this bolt?
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Unread 09-06-2010, 02:43 AM   #3
jeepjones
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Loctite.
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Unread 09-06-2010, 08:40 AM   #4
Finaltheorem47
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Hi, sorry but your description got me laughing. You need to give us more info to work on. Could be an exhaust manifold nut/bolt though. Losing one of those could make it a lot louder.
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Unread 09-06-2010, 08:56 AM   #5
the6nightmares
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holy vagueness
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Unread 09-06-2010, 09:51 AM   #6
egodfrey
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INFO PLEASE...PICS do wonders
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Unread 09-06-2010, 10:45 AM   #7
menace2
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Well, that's more information than "My car makes noises, what's wrong with it?"
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Unread 09-06-2010, 11:43 AM   #8
Steev89
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Sorry for the vagueness. one of my friends suggested loctite also. here are a couple pictures of where it is though.

Here is the bolt itself


It might be a bit hard to see but the bolt fell out of the hole there beneath the brake fluid resivoir


here is a bit closer pic
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Unread 09-06-2010, 05:17 PM   #9
solidsnake1761
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it look like its on the exhaust to me. it look like a o2 censor delete.
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Unread 09-06-2010, 05:32 PM   #10
cruiser54
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Fabbed up EGR tube bung plug on the exhaust manifold, probably because the EGR tube went to crap.
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Unread 09-06-2010, 05:44 PM   #11
menace2
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That's reall odd. A 99 does not have EGR and stranger, does not have a tube sticking out at that location, and does not have a hole in the exhaust manifold there. I can't imagine what it is.
But that does appear to be a plug made out of a brass fitting and a bolt. The threads appear to be buggered, which would help explain it not staying in.
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Unread 09-06-2010, 06:25 PM   #12
FairlanePhil
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I'd buy an air fuel meter and plug it in there just for kicks.
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Unread 09-06-2010, 06:39 PM   #13
AZ Jeff
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Steve,

As others have noted, the photos of your engine compartment show features that are NOT normally found on a 1999 XJ with a 4.0L IN LINE (not "V") six cylinder engine.

The hole you see is in the exhaust manifold of the engine, and the noise you hear is exhaust gases finding a way out other than through the tailpipe and muffler.

The bolt you show is functioning as a plug for that hole, and is made from brass. The soft threads of the brass are stripped, and will not tighten properly in the hole. You need a new plug.
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Unread 09-06-2010, 07:16 PM   #14
cruiser54
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It appears to have a Renix exhaust manifold. Weird.
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Unread 09-06-2010, 09:51 PM   #15
Steev89
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Thank you all for your help. I didnt know that it was unusual for my jeep to have that there but thats interesting to know.

I did go to a auto parts store and bought a new bolt and some loctite for it and put it in there nice and tight. And it sounds better than before even with that previous bolt in there. Also while showing him the bolt he said it looked to him that whoever had it before rigged that bolt together himself.

And you say it has things not normally found in my year jeep which again i didnt know anything was different about my jeep I purchased it a few months ago from a friend of my fathers who runs a auto mechanics garage who got it from an auction and fixed what needed to get fixed so I dont know what the previous owner did with it.

Menace2 mentioned a EGR tube, do you mind if I ask what that is? Also is a renix exhaust a good thing or a bad thing? or is it simply just weird. and why would the person have put them in the jeep? If you dont mind me asking. If I should start a different thread for these questions let me know and I will. Thank you again.
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