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Old 05-04-2015, 12:09 AM   #9 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

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 2,157 Times in 1,463 Posts
Amazingly, I appear to have solved the problem from a "surprise" direction. I was wishing for a mechanical vacuum gauge because it seems odd to always rely on the mediation of the UltraGauge or my OBD2 diagnotic reader thing. Then I remembered someone saying cleaning old grounds can help the car run. Then I remembered cleaning the grounds has been on my list of long-procrastinated maintenance for a year or two. Then I took 30 mins to clean engine ground, transmission ground, battery ground, and one other grounding cable. And.... PROBLEMS ARE GONE! Just pulled nearly 70mpg in traffic on a 30 mile test run. Mostly normal fuel trim for a car doing a lo of P&G (slightly on the + side by 2 or 3%). Wow. They had not been cleaned since 1998. Hahaha!

BTW, I also got fuel system cleaner, Mech. What the hell, it can't hurt. I bought a big bottle to use in each tank for a few months. Thanks!
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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