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-   -   My Jeep is a lot quieter now (new exhaust manifold) (http://www.wranglerforum.com/f282/my-jeep-is-a-lot-quieter-now-new-exhaust-manifold-44449.html)

Storm27m 02-13-2010 06:01 PM

My Jeep is a lot quieter now (new exhaust manifold)
 
I finally got around to changing out my exhaust manifold this weekend. I put in one of the ebay specials with the flex joints. I used the write-up off daily driven TJ:

[Repair] Exhaust Manifold Replacement Guide


It's a good write-up with good pictures. The only thing I did differently was that I did not remove the throttle body because it isn't necessary. I removed the cables off of it instead and left the TB on the manifold. I also replaced the fuel injector o-rings. They looked fine, but figured I'd change them since I had it apart anyways. Overall, it was a pretty easy job. The hardest part was accessing the bottom four bolts during removal AND installation. I was able to get to them from the top of the engine compartment by using just about every combination of extensions possible. I'm glad I have a lot of extensions. The job took me about four hours, not including a parts run to Ace Hardware. The ebay manifold came with new grade 8 nuts/bolts for the manifold/exhaust junction but the nuts were deformed. One trip to Ace and $0.98 later and I was back in business. I sprayed all the bolts down with PB Blaster the night before and had no issues getting anything apart.

So you want to talk about cracked? The old manifold was hanging on by a thread. Both of the pipes were cracked nearly all the way around. One was held on by about 1/4 inch and the other by about 3/4 inch. It also looked like the manifold had been repaired before (extra welds).
http://i245.photobucket.com/albums/g.../manifold1.jpg

http://i245.photobucket.com/albums/g.../manifold2.jpg

So like I said....my Jeep is MUCH quieter now. But now I have another problem. It's so quiet that I hear OTHER noises now.:banghead: I've got a clunk in the rear end somewhere. I hear it whenever I go over bumps. I'm not going to worry about it right now because a lift is going on soon and it may replace whatever is doing the clunking. If it's still there after the lift I'll have to track it down.

Atthehop 02-13-2010 06:26 PM

Turn up the radio.

2002Apex 02-13-2010 07:47 PM

What kind of noise was it making. I know mine makes a high pitch whistle. Didnt know if it could be coming from a crack like yours.

Rogue 02-13-2010 07:48 PM

X2 on turning up the radio.

I replaced my front upper control arms and bushings recently because of an excessive popping sound, and now I find that I ride around listening for noises as I turn.

So, I replaced my blown subwoofer and have been riding around listening to Guns N Roses all week!

K.C.'sJeep 02-13-2010 08:34 PM

My brother replaced my exhaust manifold about 2 weeks ago. I know what you mean about it being quiet. I was driving along the other day and I was like, man it's so quiet in here. It's so nice. Mine wasn't cracked as bad as yours but it was cracked in like 5 different places.

MR.CLIFFORD 02-13-2010 09:54 PM

:eek:

SPDNJOE 02-14-2010 01:00 AM

For the clunking, check your upper shock mounts. I had a clunking over bumps and one of the shocks was looseat the cross pin.

Storm27m 02-14-2010 03:21 PM

Apex, it's kind of hard to describe the noise. It sounded like a bad exhaust leak....kind of a pfffffy tick? It's definitely not a high pitch whistle, at least it wasn't in my case.

MR.CLIFFORD 02-14-2010 03:31 PM

Bring it over. We can find the sound!

89PBR96 02-14-2010 03:35 PM

I need to replace mine also before it gets worse it's not loud right no but make the jeep run a little ruff in the cold

Storm27m 02-14-2010 07:34 PM

Quote:

Originally Posted by 89PBR96 (Post 545831)
I need to replace mine also before it gets worse it's not loud right no but make the jeep run a little ruff in the cold


Ha! I didn't THINK mine was loud until I put the new one in. :D

89PBR96 02-14-2010 07:43 PM

Quote:

Originally Posted by Storm27m (Post 546041)
Ha! I didn't THINK mine was loud until I put the new one in. :D

LOL mine might sound better when I do the change

ryt2112 02-14-2010 10:32 PM

Congrats on the new manifold! That was one of the first things I got replaced on my TJ when I bought it... It had the typical crack right at the Y in the pipe. Almost as bad as yours... almost.
I know it makes a world of difference. It was kinda funny, the day after it went in, my girlfriend made the comment "I didn't know that a Jeep could be so quiet.. I thought they all sounded like that!" I told her that most of them do, but I wasn't going to listen to it... not when there was a flexible manifold that could be put on for about 100 bucks ;)
the only problem with replacing the manifold is that after the engine is quiet, then you can hear all the other things that need to be fixed :eek:

holes 02-15-2010 12:31 AM

The notorious manifold crack :/ hope ya went with one other than oem. Just replaced mine 2 months ago.

89PBR96 02-15-2010 12:37 AM

Quote:

Originally Posted by holes (Post 546335)
The notorious manifold crack :/ hope ya went with one other than oem. Just replaced mine 2 months ago.

He went with the flex joint manifold

Storm27m 02-15-2010 03:45 PM

Yeah, I went with the flex joint manifold that seems to be working well for people. At $67 shipped, I'll be happy if it holds up for a year or two. No way I was going to pay for OEM if there was a cheaper/better option :flipoff:

Dixie 03-15-2010 11:04 AM

Where did you get the flex joint manifold? is it the header advertised on ebay? that on is 175.oo no garantee... tthanks Richard (Dixie)

dan188 03-15-2010 12:26 PM

haha, I am reading the comments about how much quieter people's jeeps are after a manifold change and man is that the truth! Mine was cracked when I bought my TJ and it looked identical to the pics above. It had three giant cracks... after changing it out I took my dad for a ride and his first response was "wow, your jeep isn't as big of a piece of sh#t as I thought. I can actually hear things other than the exhaust leak now."... glad you got yours fixed!

IslandTJ 03-15-2010 02:56 PM

Quote:

Originally Posted by Atthehop (Post 545340)
Turn up the radio.

Or...

Take the top and doors off.

TurboTony84 03-15-2010 04:26 PM

while were on the subject of exhaust manifolds, will this work for mine?
1997 97 Jeep Wrangler 4.0L Exhaust Manifold With Gasket : eBay Motors (item 130374798216 end time Apr-14-10 02:51:45 PDT)
my manifold is starting to go. sorry for thread jacking Storm27M. oh btw i have an 02 sport 4.0

BrandonG83 06-15-2012 01:41 PM

Ebay link.
 
Quote:

Originally Posted by Storm27m (Post 546854)
Yeah, I went with the flex joint manifold that seems to be working well for people. At $67 shipped, I'll be happy if it holds up for a year or two. No way I was going to pay for OEM if there was a cheaper/better option :flipoff:

Do you have a link to the one on ebay?

Border Dave 06-15-2012 02:32 PM

Quote:

Originally Posted by BrandonG83 (Post 2476903)
Do you have a link to the one on ebay?

This thread is over two years old and the last time he made a post was over a year ago, so I don't think you're going to have much luck.


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