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2013 Civic SI, 2009 Outback Sport 5-spd (stick)
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Rotten Egg smell exhaust
Acctually, if we had low sulfur fuel (like Japan), we could have lean-burning engines and engines with direct gasoline injection (1zz-fe engine was originally designed to be direct injected, but the design had to be scrapped). These are more efficient and the gas savings could offset the increased cost of fuel. These new engine designs cannot work with high sulfur fuel.
Sulfur also poisons cat converters and increases emissions, and is responsible for increased engine (rings) wear in cold conditions (warm-up). Not mentioning the acid rain.
Keeping sulfur in fuel is a loose-loose proposition with only oil industry benefiting from it (cheap manufacturing).
BTW, the below link is to an article which assumes deacreasing sulfur levels in US fuel (table 1). http://www.bst.com.au/resources/sulphur%20special%20report.pdfMaybe the Toyota engeneers assumed that by the time 2003 corolla hits the US streets, the sulfur would be lower.I guess a wrong assumption, based on the frequency of the complains.
BTW, premium gas tends to have lower sulfur.So this is why Toyota recommends it hoping to buy some time and not having to fix the problem of smell.
This also explains why Corollas have so many problems with H2S. The converter is placed near exhaust manifold for higher temperature for lower emissions (remember, 1zz-fe is ULEV certified). This is apparantly the condition facilitating H2S production.
Now, the question is why consumers have to do this research instead of Toyota doing its own homework?
Rotten Egg smell
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