Carbon Monoxide Fix for Carb. Models

[Mudwrench]

Has anyone tried the fix posted on Suzukiinfo.com for carbon monoxide emmissions. I have started driving mine as a DD and the fumes are killing me. How could one little motor produce so much. It runs pretty good and I am getting about 27.5 to 28 MPG with 225's. My spark plugs show good color and engine response is good too.
Sure could use some help???
Mudwrench

[mac]

Welcome to the bbs.
I have not seen the fix but you need to get the tail pipe out to the side so the wind will take away  the fumes.

[WAZUK]

Where the exhaust pipe ends at the back bumper have the muffler shop cut it off at the break point behind the rear axle and reroute the tail pipe so it will direct your exhaust fumes off to the left side of your Samurai in  a line with your left quarter panel that will direct the fumes away from your passenger compartment.  I had the same problem with mine until I rerouted my tailpipe.



See left rear corner of Samurai photo for example of how I did it.

[zukwithleather]

thats how they came from the factory 

[GeoB]

CO is a colorless, odorless gas.  It doesn't make your eyes sting er nuthin.  I bet you meant 'hydrocarbons' in general!  :-)  Course there probbly is some CO there too.

I am not picking on you... it is just that it might be important someday for somebody to know the difference.

CO attaches to your red blood cells easier and faster than O2 does.  It blocks O2 from getting on there, to go to yer brain and stuff.  It attaches stronger, so it takes a good while to get it out of yer system.  Lethargy, stumbling speech, sleepy, rosey cheeks and lips

CO Poisoning Symptoms
Know the symptoms of CO poisoning. At moderate levels, you or your family can get severe headaches, become dizzy, mentally confused, nauseated, or faint. You can even die if these levels persist for a long time. Low levels can cause shortness of breath, mild nausea, and mild headaches, and may have longer term effects on your health. Since many of these symptoms are similar to those of the flu, food poisoning, or other illnesses, you may not think that CO poisoning could be the cause.

[ack]

Has anyone tried the fix posted on Suzukiinfo.com for carbon monoxide emmissions. I have started driving mine as a DD and the fumes are killing me. How could one little motor produce so much. It runs pretty good and I am getting about 27.5 to 28 MPG with 225's. My spark plugs show good color and engine response is good too.
Sure could use some help???
Mudwrench

I suspect that you have a leaky exhaust system.

If you cannot find any leaks in the exhaust pipe and, as others have suggested, the exhaust pipe ends pointing out of the side behind the drivers' side rear wheel, try checking this:

Remove the preheater hose and then the heat shield on the exhaust manifold.  a 10mm socket will work.  Carefully examine the manifold casting for cracks.  They should be easy to spot as there is often a bit of discolorization of the metal around the crack.  If there are any cracks, replace the exhaust manifold.  You can usually find a good one at a junkyard for not much money. 

This kind of leak is rare on a Samurai (not so on early TracKicks!) and the leak may disappear as the manifold heats up.  Something to check out though...

Also, you may be smelling oil that is leaking somewhere on your engine and is being vaporized by heat...


Hope this helps!

[Mudwrench]

Thanks for all the hints. I have also noticed that when I am going down the highway at normal speeds as soon as I take my foot off the gas I get a whiff of exhaust. I cant really tell that it makes any diff whether the vent is on fresh air or recirculate. I don't think I am smelling any vaporized oil because I have my head under the hood everyday. I will gladly chase all the hints you guys have given me.........

Are the fuel injected models known to be any better than the carb. models for the backwashing of emmissions into the cab?

Mudwrench

[rangerscott]

Check your charcoal canister, exhasut manifold for cracks/leaky gasket, and your exhaust system.

[flsammyfm]

This is not a new topic, and the reasons given all make sense.

I've found a lot of the cause to be gas velocity, or the lack thereof.

I've changed from stock to a 2" system, which had zero leakage, and followed the original route carefully, including the turn-out at the tailpipe, and it had a noticeably stinky discharge.

As that system deteriorated, I planned and build a 2.5" mandrel-bent, stainless system, with a Flowmaster muffler, no catalyst, and again, following the original route, complete with the turn-out. Even more stinky, but it sure sounded and ran nice.

The stinkiness became an issue, so I ordered a header baffle from Summit, and pressed it into the exhaust pipe downpipe of the header. It took away a raspiness that I had really come to like, but was a little rice-y. It also improved the stink factor by a small margin, so I began thinking........

At the tailpipe, I clamped on a 2.5" to 1.75" reducer (temporarily), and adapted it to a 1 5/8" adaptor. It looked, well, really un-cool. It did, however, completely, and I mean completely, eliminate the stink, even upon decelleration, where it was most noticeable.

I think the big problem is that the gases just aren't expelled from the body area with larger exhaust, even on high-revving engines like mine (7k every day!). I did notice a power loss at high rpm, and I'm deciding on my next move. It will likely be a 2", mandrel-bent stainless system, with no catalyst, and a tailpipe with a restrictor welded in.

It goes against all we hold dear as far as airflow, but sometimes, it's good not to smell like exhaust fumes.......

[smbrn3]

I suspect that you have a leaky exhaust system.

If you cannot find any leaks in the exhaust pipe and, as others have suggested, the exhaust pipe ends pointing out of the side behind the drivers' side rear wheel, try checking this:

Remove the preheater hose and then the heat shield on the exhaust manifold.  a 10mm socket will work.  Carefully examine the manifold casting for cracks.  They should be easy to spot as there is often a bit of discolorization of the metal around the crack.  If there are any cracks, replace the exhaust manifold.  You can usually find a good one at a junkyard for not much money. 
This kind of leak is rare on a Samurai (not so on early TracKicks!) and the leak may disappear as the manifold heats up.  Something to check out though...

Also, you may be smelling oil that is leaking somewhere on your engine and is being vaporized by heat...


Hope this helps!

I'm not so sure about finding one in a junk yard that's good.
I've had several over the years and tried multiple times to locate a decent replacment.
Everyone I've ha d personal experience with has been cracked, I have had fair success with welding up the cracks , of the 3 I have currently I run headers on them.

[Vagabond]

Use an Ethanol gas mix and it will reduce your emissions considerably.