Exhaust fumes - JeepForum.com
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post #1 of 83 Old 01-31-2020, 04:02 PM Thread Starter
agear
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So I know jeeps are known for their exhaust fumes. Having said that I think mine are excessive. My idle air fuel ratio is 13.4 but will get leaner the longer it idles. It doesnt burn oil . Seems like I could go an oil change interval with out adding any even though it's normal to. My spark plugs look fine. I was getting a lot of oil in my combustion chamber because I needed different valve seals. Now I'm not since I switched seals. . Could i have fouled up the cat or muffler when i had the wrong valve seals ? I also added a tail pipe extension so my exhaust exits out behind the bumper . What do you think could be causing this ?


1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #2 of 83 Old 01-31-2020, 04:15 PM
Fourtrail
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Behind the bumper is an area of low pressure, you need to have the exhaust go out the side of the jeep. Yes you could have broken down the cat with excessive oil consumption, but then you would get the rotten egg smell if it was going bad.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #3 of 83 Old 01-31-2020, 04:24 PM Thread Starter
agear
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Quote:
Originally Posted by Fourtrail View Post
Behind the bumper is an area of low pressure, you need to have the exhaust go out the side of the jeep. Yes you could have broken down the cat with excessive oil consumption, but then you would get the rotten egg smell if it was going bad.
Thank you. No rotten egg smell. I forgot to mention I put a cap full of atf down the carb so it would smoke for a couple minutes and the only place smoke was coming out was the tail pipe so I dont think I have any leaks. I need to figure out a way to get the fumes themselves down because people at drive thrus and parked in the parking lots idling notice it
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20200101_094436_1580512930557.jpg  

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #4 of 83 Old 01-31-2020, 04:34 PM
Fourtrail
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Just start adding this to every tank...





(not safe for use with catalytic convertors)

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #5 of 83 Old 01-31-2020, 04:38 PM Thread Starter
agear
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Quote:
Originally Posted by Fourtrail View Post
Just start adding this to every tank...





(not safe for use with catalytic convertors)
Uhu lol

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #6 of 83 Old 01-31-2020, 05:09 PM
Hurricane4
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#1.) Purchase one of these - photos below - in the appropriate size for your tailpipe - whichever you think will work better - 45 or 90 degree bend.

#2.) Place purchased section of mandrel bent pipe up against existing tail-pipe - make certain outlet of new bent pipe reaches to edge of body then
cut existing tail-pipe back to accommodate new short bend.

#3.) Install new Mandrel Bent Pipe and angle / turn it down a little.

#4.) Clamp or weld pipe to existing tail-pipe.

#5.) Have a Beer!
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post #7 of 83 Old 02-01-2020, 11:37 AM Thread Starter
agear
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Quote:
Originally Posted by Hurricane4 View Post
#1.) Purchase one of these - photos below - in the appropriate size for your tailpipe - whichever you think will work better - 45 or 90 degree bend.

#2.) Place purchased section of mandrel bent pipe up against existing tail-pipe - make certain outlet of new bent pipe reaches to edge of body then
cut existing tail-pipe back to accommodate new short bend.

#3.) Install new Mandrel Bent Pipe and angle / turn it down a little.

#4.) Clamp or weld pipe to existing tail-pipe.

#5.) Have a Beer!
Do you have a link ? It always says blocked image. Interesting you say it should exit out to the side. I had an expert tell me yo have it exit out behind the bumper so it doesnt get caught up in the wheel well .

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #8 of 83 Old 02-01-2020, 12:04 PM
Matt1981CJ7
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agear,

I don't know who these "experts" are who you are talking to, but they don't know squat about CJs.

It's a well known fact that a CJs exhaust should exit out the side behind the rear tire. This prevents the exhaust from boiling back into the cab from the turbulence created in the back of a CJ's square shaped tub.

There's a reason why the factory did it that way.

Matt


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post #9 of 83 Old 02-01-2020, 12:09 PM Thread Starter
agear
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Originally Posted by Matt1981CJ7 View Post
agear,

I don't know who these "experts" are who you are talking to, but they don't know squat about CJs.

It's a well known fact that a CJs exhaust should exit out the side behind the rear tire. This prevents the exhaust from boiling back into the cab from the turbulence created in the back of a CJ's square shaped tub.

There's a reason why the factory did it that way.

Matt
Okay. I couldn't see the image above but I'll look for a 45 or 90 degree tail pipe extension.

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #10 of 83 Old 02-01-2020, 12:20 PM
Matt1981CJ7
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Dude, if you're gonna ask for help, here, you HAVE to get a browser that is compatible with this forum.

Pictures speak a thousand words, so you need to be able to see them.

Time to upgrade your computer, perhaps?

Matt


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post #11 of 83 Old 02-01-2020, 12:45 PM Thread Starter
agear
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Can it be behind the jeep but come out beside the line of the side of the jeep ?

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #12 of 83 Old 02-01-2020, 01:05 PM
Matt1981CJ7
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Should look like this.
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post #13 of 83 Old 02-01-2020, 01:12 PM Thread Starter
agear
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Quote:
Originally Posted by Matt1981CJ7 View Post
Should look like this.
Gotta a link ?

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #14 of 83 Old 02-01-2020, 01:51 PM
Matt1981CJ7
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It's a screen grab from the Jeep Technical Service Manual on my computer.

I'm pretty sure I've given you a link to the TSM in the past. If not, Google "Jeep CJ Technical Service Manual PDF". Then click on the first link that comes up

Then look up the exhaust system for yourself.

Matt


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post #15 of 83 Old 02-01-2020, 02:20 PM Thread Starter
agear
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Okay thank you

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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