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Question for the Auto Mechanics, Rotten Egg Smell *REVISITED* Pg 5
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In accordance with industry accepted best practices we ask that users limit their copy / paste of copyrighted material to the relevant portions of the article you wish to discuss and no more than 50% of the source material, provide a link back to the original article and provide your original comments / criticism in your post with the article.
[quote:BrokenTech:MV8zNDExMTI3XzYwNzgwNTk1XzM0MTlDNEZB] [quote:Anonymous Coward 73706403:MV8zNDExMTI3XzYwNzgwNTUzXzcxQ0YyRUMz] [quote:BrokenTech:MV8zNDExMTI3XzYwNzgwNDc2XzMyNTFEMkY5] [quote:Anonymous Coward 73706403:MV8zNDExMTI3XzYwNzgwNDU1Xzk5NkVFMUMx] [quote:BrokenTech:MV8zNDExMTI3XzYwNzgwMTkyX0FENzRGOTg1] if bank 1 is detecting a false lean condition due to unmetered air, you'll see a big fluctuation in the reading on bank1o2 in freeze frame diagnostics. and was your pcm tune a mail order or real time tune? *** you can also do a basic check if you have a good dtc reader. if your fuel trim is running greater than 10%, the computer is trying to compensate for something. one thing to remember here is that your car is supercharged. its better to run lean with boost than rich, so be careful running it hard until you get it straightened out. running rich with a boosted car opens up the opportunity for detonation...which is something you want to avoid like the plague. [/quote] Always better to run [b]rich[/b] no matter how it's boosted. Rich will give you some margin of safety. Lean will cause detonation / preignition issues. Lean is hot. Two strokes will seize if they go lean under (heavy) load / throttle. Now, diesels on the other hand.... [/quote] Would that be detected with the knock sensor? If so, the knocks are zero. [/quote] Should. Any pinging / detonation / preignition should be picked up by the knock sensor (if working properly) and the PCM will dial back ignition advance (and richen the mixture in some applications) until the pinging / detonation ceases. It will then immediately start dialing in more advance until the pinging / detonation resumes. This "dance" happens at hundreds of times per second, and will continue until modified parameters are set, or higher octane fuel is used. If the octane rating of the fuel is high enough (for the maximum programmed spark timing advance), this pinging / detonation will never occur. [/quote] Using premium like the manufacturer recommends. [/quote]
Original Message
I am fairly mechanically inclined, I do all the maintenance and repairs on my cars. I have encountered an issue that has perplexed me and was looking for more insight.
I am getting a rotten egg smell. As I have always understood it, the rotten egg smell is the result of the sulfur in the fuel contacting the platinum in the catalytic converter.
I am going to withhold a few vehicle specifics, for now, because I have been getting some automatic generic responses that the catalytic is bad and needs to be replaced. I do not buy that, however, if this continues I believe on a long enough time line it will eventually ruin the catalytic. In this case if I were to replace the catalytic, I do not feel the problem would be resolved and would still continue.
I will say that if I change who I buy the fuel from it seems to stop temporarily. It seems to resolve it for 3-4 tanks of gas then it returns. I have three different places that I cycle through buying gas from.
What could be some other things that could cause this to happen? I will say that I am forced to use premium fuel.
Sorry for the lack of vehicle information and vagueness, this is just how my bullshit detectors work.
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