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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.
Posted by: nolimit94VIII
Were the O2 sensors replaced? Do you still have the 3rd cat?
That would be my two best guesses for the smell.
Posted by: nolimit94VIII
Next guess and could most likely be the problem would be the EGR tube. Might want to make sure that both cats are most definitely not leaking around the welds. If you're not the one that done the welding, I wouldn't take the other persons word for it. Get them to show you they aren't leaking. I just noticed that you went to the two in and two out so that tells me that the 3rd cat is gone so I would say EGR tube or there is still a leak somewhere.
