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1996 Honda Civic Question: RPM's surge after engine runs 3-5 min Idle to 800 over ,then back to Idle

 

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capt108, 1.6L 4 Cylinder, Fairfield, IA, March 09, 2010, 07:05
 Rookie

After 3-5 min when car is warmed-up..it starts a regular up & down on RPMs, not many maybe 500-800 increase then back to idle..no fault codes that would explain it, one o2 sensor,but it did it before that fault came up..12-18 months now..

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