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What is this and can I Cut it out ?

H

Hylander

NAXJA Forum User
Location
Texas
1997 4.0
What is this Bubble in my Exhaust and can I Cut it out ?
Probably an expansion chamber, but is it necassary ?
I am trying to replace my Trans Solenoids and this will not let
the Pan drop.
I can not move the Exhaust forward or back without cutting it, so I have to cut the Exhaust on the side of the trans so I can get a cuppler on it to reinstall it.
But if I cut that Bubble out and install the same size tube, the Pan would come out.
I do live in California and have to Smog.

IMG_0509.jpg
 
Last edited:
cut it out!!! i've put that motor in my old jeep, and i had a header and straight pipe to a glass pack, and never had an issue. it won't hurt the jeep. what year is yours? i think you'll be fine, but i don't hafta pass emissions testing...
 
can't do that in Lincoln, I got put through the gauntlet when I got smogged with a 04 TJ when I lived out there
 
Thought expansion chambers really only worked well with 2 strokes. I know mine doesn't have that bulge.
 
H8PVMT said:
can't do that in Lincoln, I got put through the gauntlet when I got smogged with a 04 TJ when I lived out there
Click to expand...
lastarai'm glad i live where i do then... i wouldn't even try to pass smog. hell, i'm suppposed to here, but my parents live in a county where you don't hafta, so as far as anybody knows, i live with them...
 
Why not take all the hangers loose and shift the exhaust...or take it down from the collector?
 
your jeep probably just ate a rat
 
Joshooha said:
Why not take all the hangers loose and shift the exhaust...or take it down from the collector?
Click to expand...

Can't shift it, 1" back hits the Trans Bell Housing.
Can't shift forwad because of the Collector bolts.
It has to drop straight down and the only way that can happen is if I unbolt the whole Exhaust system and drop the Trans Crossmember.
 
Hylander said:
Can't shift it, 1" back hits the Trans Bell Housing.
Can't shift forwad because of the Collector bolts.
It has to drop straight down and the only way that can happen is if I unbolt the whole Exhaust system and drop the Trans Crossmember.
Click to expand...

So just unbolt the whole thing. Trust me it's a lot easier and cheaper than trying to fab something in there.
 
that looks like a pre-cat to me. are there bolts or studs in the manifold? maybe lifting the rear of the will let the pan out. just undo the mount and see how far up the trans will go.

zedpapa
 
No precat in a '97, thinking though its just the joint where it goes from smaller dia. to 2.25
 
my 97 has the same thing, I always thought it was a precat, lousy CA smog nazis and all, perhaps someone with a non-CA '97 could see if they have the same deal

also FWIW I've had the pan off to change the filter and don't recall having any issues:dunno:
 
Unbolt the exhaust and drop it. It'll be easier in the long run.
 
Cut it out, make your repairs, then weld in a stainless stell flex piece.
 
FoMoCo said:
my 97 has the same thing, I always thought it was a precat, lousy CA smog nazis and all, perhaps someone with a non-CA '97 could see if they have the same deal

also FWIW I've had the pan off to change the filter and don't recall having any issues:dunno:
Click to expand...

MIne doesn't have it. It must be a Cali thing!
 
OK:
Well I didn't to cut it after all.
After taking alittle time to assess the situation better.
I realized that my TC drop was binding up the entire exhaust system.
I removed the TC drop and put the TC back up where it should be and the exhaust was able to be moved out of the way without cutting it.
So now I must install a H&T SYE, which I was going to do anyway, just didn't want to have to do it right now.
 
So did the solenoids fix it? I know you've had quite a few threads up and have been chasing this problem for a while. Got my fingers crossed for ya.

Re: SYE kits, IMHO you should reconsider and go with a good quality unit, not a hack'n tap.
 
JJacobs said:
So did the solenoids fix it? I know you've had quite a few threads up and have been chasing this problem for a while. Got my fingers crossed for ya.

Re: SYE kits, IMHO you should reconsider and go with a good quality unit, not a hack'n tap.
Click to expand...
What if he has a NP242
 
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