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Surging is when the engine revs change noticeably under constant load and constant throttle (which in theory should result in constant RPM). A very typical one is my Eagle Talon, that had a vacuum leak and at idle the revs would vary between 500 and 1500 rpm as the ECU was trying to control the idle, but didn't know about the additional air. Another typical ...


I don't know when exactly Honda stopped programming this behavior into their cars, but I do know that what you described is a warm-up sequence that some older Hondas go through by design. First a high idle, then an alternating high and low idle (1-2 seconds/cycle), then normal low idle. I would say that the behavior you describe is normal, and not ...

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