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What is happening with fuel trim? If there was a spark problem from a worn dstributor the fuel would not gather in the combustion chamber so muchas blow throw the exhaust ports to the cat and O2 sensor. The sensor would detect less oxygen, the ECU would react. Is a Metro EFI? Does it have like one injector or something? I forget.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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