87 300E runs great but mpg suddenly bad

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87 300E runs great but mpg suddenly bad

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lizem100 87 300E runs great but mpg... 12-14-2005, 04:37 PM

MikeF When mine did that I replaced... 12-14-2005, 08:24 PM

A264172 High probability of O²... 12-14-2005, 08:50 PM

lizem100 Should O2 sensor light come... 12-14-2005, 11:29 PM

lizem100 Have digital multimeter but... 12-14-2005, 11:32 PM

More replies below current depth...

STUKA Winter Fuel Formula ?? 12-15-2005, 12:47 AM

lkchris Yes, ethanol is welfare for... 12-15-2005, 12:44 PM

lizem100 Will try to measure on Sat. 12-15-2005, 12:54 PM

lizem100 Final Result to this saga 01-15-2006, 09:49 PM

A264172 Thanks for the follow up.... 01-27-2006, 08:02 AM

12-14-2005, 04:37 PM

lizem100

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Join Date: Apr 2001

Location: fort worth

Posts: 363

87 300E runs great but mpg suddenly bad

Car runs normally. O2 sensor light not on. Do not smell gas leak- changed fuel filter 30 d ago. Mpg tumbled in last week from 22-25 to 17. Perhaps one time event /bad measurement but this tank is dropping fast too. Any ideas? Thanks

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