Exhaust Smell Even After Reroute - JeepForum.com
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post #1 of 26 Old 07-30-2018, 04:30 PM Thread Starter
SteveOCJ5
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Exhaust Smell Even After Reroute

Hey guys. When I got my Jeep it had straight out the back pipes and the exhaust smell was awful. So recently I took it in and had it rerouted (with a fresh set of 40 series Flowmasters) to the back corners (as I've previously read to do) see pic below. However, all though not as bad as it was, I'm still getting exhaust smell in the cab (top off, top on, bikini, all of it)... I really don't want to put cats back on but will if needed... I just want to be able to drive around without smelling fumes...

Any ideas?

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post #2 of 26 Old 07-30-2018, 05:26 PM
Matt1981CJ7
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Are you 100% positive there isn't a leak somewhere?

Does the exhaust smell normal, sweet, or have a hint of raw fuel to it?

Matt


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post #3 of 26 Old 07-30-2018, 05:30 PM Thread Starter
SteveOCJ5
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Quote:
Originally Posted by Matt1981CJ7 View Post
Are you 100% positive there isn't a leak somewhere?

Does the exhaust smell normal, sweet, or have a hint of raw fuel to it?

Matt
Hey Matt. I'm pretty certain there are no leaks. Smells like normal exhaust but much more pungent. It's been awhile since I've owned a vehicle without a cat so seems pretty strong to me...

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post #4 of 26 Old 07-30-2018, 05:37 PM
TIPPEDITOVER
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A SBC in good tune will smell stinkier than you think it would without cats. Dealt with it for years. I put cats in my pipes for the LS swap

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post #5 of 26 Old 07-30-2018, 05:39 PM Thread Starter
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Originally Posted by TIPPEDITOVER View Post
A SBC in good tune will smell stinkier than you think it would without cats. Dealt with it for years. I put cats in my pipes for the LS swap
Ugh. I can't take a short drive without getting out and smelling like exhaust fumes...

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post #6 of 26 Old 07-30-2018, 05:41 PM
TIPPEDITOVER
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Quote:
Originally Posted by SteveOCJ5 View Post
Ugh. I can't take a short drive without getting out and smelling like exhaust fumes...

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Mine was so bad I'd have a ruthless headache at the end of a day of trail riding. All my buddies always put me in the back, they couldn't take it either haha.

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post #7 of 26 Old 07-30-2018, 05:45 PM
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Your exhaust is routed correctly out the corner to prevent the fumes from rolling into the cab from the backdraft. You shouldn't be smelling it while driving. If you are, I'd suspect a leak.

Is your engine tuned well? Burning any oil? Coolant staying at a consistent level?

A CAT will reduce sulfur smells (think rotten eggs), but that doesn't sound like what you're smelling.

Matt


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post #8 of 26 Old 07-30-2018, 05:52 PM Thread Starter
SteveOCJ5
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Originally Posted by Matt1981CJ7 View Post
Your exhaust is routed correctly out the corner to prevent the fumes from rolling into the cab from the backdraft. You shouldn't be smelling it while driving. If you are, I'd suspect a leak.

Is your engine tuned well? Burning any oil? Coolant staying at a consistent level?

A CAT will reduce sulfur smells (think rotten eggs), but that doesn't sound like what you're smelling.

Matt
I'll climb under it tomorrow and see if I can find any leaks... It better not, I just had the entire exhaust done a month ago..

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post #9 of 26 Old 07-30-2018, 11:09 PM
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From your picture of your tailpipes it looks like the ends could be shortened a couple inches. That would put the exhaust coming out directly behind the tire tread....what do ya think?
Could your longer pipes be causing the fumes to somehow swirl back into the cab?
My single pipe exits at the corner, but not as far out as yours, and it solved the fumes problem.

Throwing this out there, good luck
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post #10 of 26 Old 07-31-2018, 06:03 AM
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I find this interesting given that your engine tune as been brought up on your water temp thread. Possible correlation?

I'd set the timing to 12*, switch to manifold vacuum and check the mixture screws for lean-best idle and see if that helps with the stink. PCV in good shape?


Shawn

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post #11 of 26 Old 07-31-2018, 01:33 PM Thread Starter
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Originally Posted by swatson454 View Post
I find this interesting given that your engine tune as been brought up on your water temp thread. Possible correlation?

I'd set the timing to 12*, switch to manifold vacuum and check the mixture screws for lean-best idle and see if that helps with the stink. PCV in good shape?


Shawn
I will be going to have my timing checked and adjusted today.. will report back.

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post #12 of 26 Old 07-31-2018, 03:44 PM Thread Starter
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The timing was a little bit high. We adjusted it back down to 12*. Hopefully that will make a difference.

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post #13 of 26 Old 07-31-2018, 03:53 PM
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Is your vac advance connected to manifold or ported vacuum?

Have you tuned your carb for lean/best idle, now that the timing was changed?

Matt


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post #14 of 26 Old 07-31-2018, 04:00 PM Thread Starter
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Quote:
Originally Posted by Matt1981CJ7 View Post
Is your vac advance connected to manifold or ported vacuum?

Have you tuned your carb for lean/best idle, now that the timing was changed?

Matt
Hi Matt. I'm a little bit if a novice when it comes to vacuum advance so I took a few pics of my carb and manifold. Hopefully you can see what you are asking me or maybe you can tell me what else to look at..

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post #15 of 26 Old 07-31-2018, 04:11 PM
Matt1981CJ7
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Sorry, your pics don't tell me much about the vac advance.

With engine idling, pull the hose that connects to the vac advance. If there is suction on the hose, you are correctly connected to manifold vacuum. If there is no suction, it's connected to ported, and should be changed to manifold.

You do know what the vac advance is and where it's located, correct?

Matt


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