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Old 10-29-2015, 11:16 AM   #28 (permalink)
97-civic-ex
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Join Date: Aug 2010
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On thing that really affects mpgs on Honda lean burn is EGR system condition. Are you getting any check engine lights? Make sure the check engine might comes on for a few seconds at start up to verify the bulb is functional. The main issue with the EGR system is clogged passages and sticky/faulty EGR valve.
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