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Re: Backfire



JimA=> If your bus does this, then I would GUESS that something is 
    => set a bit rich, ...

Sorry, I should have been more explicit. The bus has a fuel-injected 2L T4 
engine and an obvious exhaust leak just before the muffler, plus it 
ordinarily operates at over 5300 feet altitude. So yes, lowish oxygen 
content makes for a relatively rich mixture, and there are lots of sooty 
tailpipes up here. What I wonder is how the leak contributes to the 
popping. Or is it that the popping is normal and, since the leak is 
before the muffler, I can hear it where I wouldn't if the exhaust were 
tight?

Steven Ayres, Prescott AZ


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