exhaust smell

[tylka4runner]

Ok guys my 07 4runner has been getting the rotten eggs smell when accelerating hard from like 30-70mhp. Any solutions? I always use shell premium gas too.. Delete cat or replace?

Thanks in advance

 

[Dominic]

Premium? I used regular for most of the life of mine and got that smell. I recently switched to mid grade and the egg smell went away. You could try switching to Kroger gas or somewhere else and see what the results are.

You can always have your exhaust come out behind the rear tire, then you won't get that smell.

 

[TwoPairsofBoots]

There's a Service Bulletin out there for exactly this issue – I don't remember the number but search the 4th Gen forum for details.

If you can still get the cat replaced under warranty, go for it. I had it replaced on my last 4R (it got totaled), and then I just had the same thing done again this week on my replacement 4R. $2000+ of free work. :happy:

Once the warranty work is done, THEN pay your local shop $100 or so to reroute your exhaust, so it points off to the side (behind your tire), instead of out to the back.

 

[YotaDriver]

Don't drive with your rear window down and you won't smell your exhaust. It's a normal byproduct of the catalytic converter doing its job, not a defect.

 

[wadle5]

Premium? I used regular for most of the life of mine and got that smell. I recently switched to mid grade and the egg smell went away. You could try switching to Kroger gas or somewhere else and see what the results are.

You can always have your exhaust come out behind the rear tire, then you won't get that smell.

I have always ran premium and still get it. A way to just not have that happen is either roll down your windows and/or sunroof to keep airflow moving through the vehicle and not having the smell circle back in the rear with just the rear window down. . . or install a side exhaust.

 

[tylka4runner]

I have owned the runner for about 4 weeks and since I had it yes shell premium. Not sure on the previous owner.

 

[eddiebx]

I think it's normal...I believe it's something to do with sulfur as a byproduct out of the catalytic converters. Doubt it would matter if you ran regular or premium

 

[EdmundGTP]

Stop accelerating to highway speeds with your rear hatch window rolled down.. Simple as that.. If you have any your front windows down (sunroof included), and your rear hatch window down, a low pressure zone is created inside of the cabin relative to the air outside the top, and sides of your 4R. The turbulent mass of air at the immediate rear of the vehicle that is created as you accelerate is also a low pressure zone, but not AS low as the inside of your cabin. Because of this, a certain quantity of cabin air is sucked OUT through the front windows and the sunroof, and simultaneously, outside air is sucked IN through the back hatch window, from the same region into which the tailpipe exhausts.

There isn't anything "wrong" or broken. You either leave your back hatch window up while driving on the highway, or re-route your tailpipe to exhaust on the side of the vehicle so that your exhaust gas gets caught up in the passenger side slip-stream and trails away, as opposed to staying "stagnant" in the low pressure turbulence behind your car.

 

[hamiltonj2w1]

Ok guys my 07 4runner has been getting the rotten eggs smell when accelerating hard from like 30-70mhp. Any solutions? I always use shell premium gas too.. Delete cat or replace?

Thanks in advance

Do a search there are lots of threads on this subject.