Sulfur Smell When Its gunned

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mannieg

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I originally had my cats replace and decided to go with magnaflow high flow cats and magnaflow muffler 2.25 dual and dual out due to my car smelling like sulfur if I pushed the car. After the exhaust was done the check engine light came on because on of the welds near the o2 sensor was leaking, took it back got it fix no problem. My check engine light just came back on and when I gun the gas pedal I feel a little hesitation then it goes but smells like sulfur after wards, sometimes i can be cruising and it will smell like sulfur. Any thoughts? I only use Chevron Premium Octane gas, and The car has 93k miles on it. When I pulled the codes before the exhaust leak was fixed it was saying something about the o2 sensor, and The egr flow. Any help would be greatly appreciated.
 
Have you pulled the codes after the exhaust job? Did you replace the O2 sensor?
 
I doubt the original cats where ever bad, that smell means they are working but the fuel/air mixture is off.

Two new O2s will take care of that. If you have a 96 to 98 there are four, only the two forward ones are needing replacement.

As for the hesitation, that could be O2 related but it could be a couple other things like wires, coil packs, etc...

Posting your year REALLY helps!
 
i have the same issue my 94 mark viii have 156K and all the original exhaust but smells like rottin eggs when i gun it
 
Same, on the 94 here.


I was running up I25 here in the springs, and got on it to run around a Semi before an exit, and got to smellin sulfur. O2 Sensor time.
 
mine too. only at wot and most noticibly in od in high speed runs? ive never smelled it at lower speeds. wierd.
 
its a 97 gen 2.

unity said:
I doubt the original cats where ever bad, that smell means they are working but the fuel/air mixture is off.

Two new O2s will take care of that. If you have a 96 to 98 there are four, only the two forward ones are needing replacement.

As for the hesitation, that could be O2 related but it could be a couple other things like wires, coil packs, etc...

Posting your year REALLY helps!
Click to expand...
 
mannieg said:
its a 97 gen 2.
Click to expand...

The you have 4. The rears just make sure the cats are working right. The fronts are the ones used to check emissions and correct the fuel/air mixture. If they go bad they send the wrong info, the mixture is off and you get the smell at the cats work over-time!
 
unity said:
The you have 4. The rears just make sure the cats are working right. The fronts are the ones used to check emissions and correct the fuel/air mixture. If they go bad they send the wrong info, the mixture is off and you get the smell at the cats work over-time!
Click to expand...


I will get the codes and replace those first. Thanks for the help.
 
my friends notice it when there in my car but i do not. I have no codes - so how do I know my 02's are bad? I got a 95 base, i also only had people notice it while my exhaust was off - well its off after the midpipe after the third cat. it is only after extended WOT.

i thought when o2 sensors will go bad youll get a CEL?
 
They can go bad enough to not throw a code. Eventually a code may pop up, but sometimes only for a short time at WOT. Basically the ECU realizes something is wrong at WOT when the O2s send what could only be bad info to adjust more than the ECU is programmed to do.
 
unity said:
They can go bad enough to not throw a code. Eventually a code may pop up, but sometimes only for a short time at WOT. Basically the ECU realizes something is wrong at WOT when the O2s send what could only be bad info to adjust more than the ECU is programmed to do.
Click to expand...

Thats what exactly happens to me. Today I raced a (he wanted to, not me) souped up civic (complete with soda can muffler AND sponsorship decals) and at about 120 (I wanted to embarass him, so I pretended that I couldn't catch him and let him gain 4-6 car lengths on me) and WOT it spits up the check engine, after I get back down to about 60 mph it goes away, its been doing this for months. I'm looking at 02s now? Oh well, something else to add to the list. I'm taking a whole week of vacation time from work and plan on correcting everything on it.
 
Yup, sounds like O2s to me. Replacing them really make a BIG difference if they are bad. Your butt-o-meter and gas tank will thank you.
 
well i've never got an cel ever... i dont wanna run into one of those things were it aint broke don't fix it. if i hook my car up to one of those autozone things to check for codes, and i dont have a CEL light up, will i notice anything? or does my chip limit the cel/codes from appearing?
 
unity said:
They can go bad enough to not throw a code. Eventually a code may pop up, but sometimes only for a short time at WOT. Basically the ECU realizes something is wrong at WOT when the O2s send what could only be bad info to adjust more than the ECU is programmed to do.
Click to expand...

so as soon as you start smelling the sulfer smell, its your cats working over time because the fuel mixture is off. and its automatically the 02 sensor that usually is the culprate.

i know if you have bad 02 sensor, you can melt your cats pretty hard if you dont replace them, but no check engine... ? maybe its just stinky car because my exhaust is off after the midpipe? i think an A/F ratio and Fuel Pressure guage might be nice. Anyone got some guages in there car? where to put them?
 
Is it a good idea to change my o2's.. even if thier bad? I mean.. are they really expensive? Because sometimes I will smell sulfur.. not all the time.. just every once in a great moon.. so i'm guessing from reading this.. just go ahead and replace?

Edit: Okay.. I just read Abraham's post.. my car was only being smelly when my plugs were fouled.. I haven't smelt is since.. but maybe replacing them... will get my gas miles back.. every since I gapped my plugs .048 like OnebadMk said to do.. I've only been getting about 18 miles to a gallon.. weird..
 
Dark_Majesty_06 said:
Is it a good idea to change my o2's.. even if thier bad? I mean.. are they really expensive? Because sometimes I will smell sulfur.. not all the time.. just every once in a great moon.. so i'm guessing from reading this.. just go ahead and replace?

Edit: Okay.. I just read Abraham's post.. my car was only being smelly when my plugs were fouled.. I haven't smelt is since.. but maybe replacing them... will get my gas miles back.. every since I gapped my plugs .048 like OnebadMk said to do.. I've only been getting about 18 miles to a gallon.. weird..
Click to expand...


im planning to do the 160 degree T stat and two stage colder plugs and some nology wires. if that doesnt do it, well then ill get into the 02 sensor.

about your plugs, something must have fouled up your plugs? that could be running to rich because of (tadaaaa) bad 02's
 
Quite possibly.. or they could have fouled because of my inability to read.. i was puttting supreme in.. thinking it was premium..then I was changing gas grades for my first week.. like I was changing underware.. I would go to reg.. sup.. pre... back to reg.. to pre.. My towns messed up.. 1 station will have premium.. 4 stations won't.. and I usually run my car down to about 1 gallon left till empty.. so all my additives can be fully injected into the motor... could be bad o2's as well.. i'll have to check into getting some new o2's...
 
but you guys think for sure bad o2's if you get the rotten egg smell? what about cat. converters themselves?
 
Bad convertors dont cause the smell. A bad convertor will restrict exhaust flow, thats all.

As abe said, its only cause the mix is off.
 
so what kind of power loss can this cause(air fuel mix being off)? and can i change o2s myself?
 
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