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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