Thread: Abnormally lean AFR
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Old 03-08-2015, 07:57 PM   #26 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

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Quote:
Originally Posted by Old Mechanic View Post
It could be a bad fuel pump, odds are bad regulator, replace and retest. Plug check?

regards
mech
I ran the test again just now, and now I get no fuel pressure at all in the first test. Zero. I can hear the pump prime. Could a failing pump create the symptoms I have seen? too much fuel causing trim to get leaner, then too little fuel causing a stall?
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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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