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Car ran so poorly by the time I got home today it would shudder as I accelerated, fuel trims got as lean as -29%, and in the driveway I was able to idle it until it stalled. The computer took the car out of closed loop and ran it in open loop. So I got out the mitivac vacuum gauge and my scan tool, figuring I would measure vacuum mechanically and via the MAP sensor in inches Hg simultaneously. But first I tried three suggestions from this list: I hunted unsuccessfully for a ground wire on the intake; I sprayed water onto the hot engine to mimic rainy day humidity (no improvement); and I wiggled/pushed every wire and connector I could remember moving or brushing in previous efforts at repair. I also wiggled a couple others in the EVAP canister (I think).
That wiggling suggestion worked! The car runs perfectly normally again.
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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.
Last edited by California98Civic; 05-18-2015 at 11:47 PM..
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