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Old 05-13-2015, 03:05 PM   #13 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,171 Times in 1,468 Posts
Interestingly, once again, after maybe 200 miles "fixed" the exact same problem has returned: wildly leaning-out fuel trims, associated with a decrease in power, and decrease in fuel economy. My tank average is dropping fast. This is the third return after the initial repair. Each time the problem goes away for a few hundred miles, or even nearly 1000 miles, and then returns. First time I made it go away with a fuel pressure regulator, then replaced the regulator again when the problem came back, then fixed it by cleaning ground wires when it returned a second time. Now it is back again, for a third time.

Why does it run normally for so long and then return to this fail state again?

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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