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MetroMPG · 09-06-2012, 04:37 PM

Old Mech: impressive. Congrats.

--

serial: Aha - I misunderstood.

If your O2 sensor(s) are that bad, I'm surprised you don't have a check engine light (CEL). However, I once had a vacuum leak that caused an extremely rich mixture (even had soot in the tailpipe) and no CEL, and my Firefly's mileage dropped into the 20's from 50's.

09-06-2012, 04:37 PM	#486 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,532 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 62.14 mpg (US) Thanks: 4,082 Thanked 6,978 Times in 3,613 Posts	Old Mech: impressive. Congrats. -- serial: Aha - I misunderstood. If your O2 sensor(s) are that bad, I'm surprised you don't have a check engine light (CEL). However, I once had a vacuum leak that caused an extremely rich mixture (even had soot in the tailpipe) and no CEL, and my Firefly's mileage dropped into the 20's from 50's. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget