Rotten egg smell = bad Cat?
- Thread starter ccvortex
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Rodtheviking
New member
That is a very good question. I have always noticed it with our Toyotas or if you get behind one on the freeway. Pewww.
I see this thread - though it's for 5th gen: http://www.toyota-4runner.org/5th-gen-t4rs/64788-rotten-egg-smell.html
How can one tell the difference between "normal" egginess and a bad cat?
How can one tell the difference between "normal" egginess and a bad cat?
No issue. Mine has done it since day one.
Ratubbs
New member
Hmmm good to know because I was about to go down the bad cat avenue too.
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DisguisedRope
New member
What if you remove the cats, as in doing long tube headers and aftermarket y pipe. Would it still smell? Would it be worse?
I am assuming the smell is coming from the cats themselves so someone correct me if I am wrong, but converting to a straight exhaust system would eliminate that... but wouldn't that mess up your fuel mix ratio because the computer could no longer measure exhaust gases?
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FL_URB_RNR08
New member
rotten egg smell = you're doing it right
When I have the back window down I usually will smell it at 2/3 throttle or above.
I have dual side exit exhaust also so that does not make a difference.
When I have the back window down I usually will smell it at 2/3 throttle or above.
I have dual side exit exhaust also so that does not make a difference.
Inv4drZm
Senior Member
I've never noticed a rotten smell in any of my family's Toyota's or any vehicle for that matter. It only happens when you roll down the windows? I've only noticed when you first start up in a garage or without wind you can catch a wiff of a "rich" burn. Never smelled rotten to me just seemed like a normal part of the combustion process.
wadle5
New member
It's the smell of sulfur.......its from your exhaust. Due to air flow and vacuums the fumes from exhaust get caught and pulled into the cabin when the rear window is down.
Fixes:
don't roll down back window
don't accelerate quickly
modify exhaust to exist side of vehicle behind tire instead of directly out the rear.
Fixes:
don't roll down back window
don't accelerate quickly
modify exhaust to exist side of vehicle behind tire instead of directly out the rear.
I just sold my Jeep a month ago to get something more reliable and my obvious choice was a 4runner mainly because of the rear window drop. The fumes only occur when I floor it so I usually roll the window up before I do. But I'd like to avoid that PITA.
Could putting a downward exiting exhaust tip help? Seems like a side exit may screw with the pipe mounts. I've also seen I can cut it right before the bend in the axle. Does this cause any problems in the future? Does having the fumes exit directly under the vehicle have any affects inside the cabin?
Could putting a downward exiting exhaust tip help? Seems like a side exit may screw with the pipe mounts. I've also seen I can cut it right before the bend in the axle. Does this cause any problems in the future? Does having the fumes exit directly under the vehicle have any affects inside the cabin?
WhiteBoomer04
New member
My '04 back in 2004! - cut the resonator off and pipe exits downwards before the rear axle = no smell of eggs
